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1. general description the tdf8541 is one of a new generation of complementary quad bridge-tied load (btl) audio power amplifiers intended for automotive applications. it has full i 2 c-bus controlled diagnostics, including start-up diagnostics. th e tdf8541 can operate at a battery voltage as low as 6 v making this amplifier su itable for stop/start-car operation. the amplifier uses a complementary dmos outp ut stage in a silicon -on-insulator (soi)- based bcd process. the dmos output sta ge ensures a high power output signal with perfect sound quality. the soi-based bcd process ensures a robust amplifier, where latch-up cannot occur, with good separation between the four independent channels, with every component isolated and without substrate currents. 2. features and benefits ? stop/start-car prepared: keeps operating without audible disturbance during engine start at a battery voltage as low as 6 v ? operates in either legacy (non i 2 c-bus) or i 2 c-bus modes (3.3 v and 5 v compliant) ? four hardware-programmable i 2 c-bus addresses ? can drive 2 ? and 4 ? loads ? speaker fault detection ? start-up diagnostics with load detection: open, short, pres ent; filtered for door-slam and chatter relays ? ac load (tweeter) detection with low and high current mode ? gain select after start-up without audible disturbance ? independent selectable soft mute of front and rear channels ? programmable gain (26 db and 16 db), independently programmable for the front and rear channels ? line driver mode supports engine start at a battery voltage as low as 6 v (16 db and mid-tap voltage 0.25v p ) ? programmable clip detect: 2 %, 5 % or 10 % ? programmable thermal pre-warning ? pin stb can be programmed/multiplexed with second-clip detect ? clip information of each channel can be dire cted separately to pin diag or pin stb ? independent enabling of thermal- , clip- or load fault information (short across the load or to v p or to ground) on pin diag ? loss-of-ground and open v p safe (minimum series resistance required) ? all amplifier outputs short-circuit proof to ground, supply voltage and across the load (channel independent) ? all pins short-circuit proof to ground tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier rev. 1 ? 29 august 2011 product data sheet
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 2 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier ? temperature controlled gain reduction to prevent audio holes at high junction temperatures ? programmable low battery voltage detection to enable 7.5 v or 6 v minimum battery voltage operation ? overvoltage protection (load-dump safe up to v p = 50 v) with overvoltage pre-warning at 16 v ? offset detection 3. quick reference data 4. ordering information table 1. quick reference data symbol parameter conditions min typ max unit v p(oper) operating supply voltage r l = 4 ? 614.418v i q quiescent current no load - 260 350 ma no load; v p = 7 v - 190 - ma p o output power r l =4 ? ; v p = 14.4 v; thd = 0.5 % 18 20 - w r l =4 ? ; v p = 14.4 v; thd = 10 % 23 25 - w r l =2 ? ; v p = 14.4 v; thd = 10 % 40 44 - w p o(max) maximum output power r l =4 ? ; v p = 15.2 v; v i = 2 v rms square wave 41 45 - w r l =2 ? ; v p = 14.4 v; v i = 2 v rms square wave 58 64 - w thd total harmonic distortion p o =1wto12w; f i = 1 khz; r l =4 ? -0.010.1% v n(o) output noise voltage filter 20 hz to 22 khz (6th order); r s =50 ? amplifier mode - 40 60 ? v line driver mode - 25 33 ? v table 2. ordering information type number package name description version tdf8541j/n2 dbs27p plastic dil-bent-sil (specia l bent) power package; 27 leads (lead length 6.8 mm) sot827-1 TDF8541SD/n2 rdbs27p plastic rectangular-dil-bent -sil (reverse bent) power package; 27 leads (row spacing 2.54 mm) sot878-1 tdf8541th/n2 hsop36 plastic, heatsink small outlin e package; 36 leads; low stand-off height sot851-1
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 3 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 5. block diagram pin numbers in parenthesis relate to type tdf8541th (package hsop36). fig 1. block diagram 001aan083 standby/ fast mute i 2 c-bus sda scl v p1 v p2 adsel select diagnostic/ clip detect engine start protection stb in3 in1 in4 in2 diag out3+ out3- out1+ out1- out4+ out4- out2+ out2- mute protection/ diagnostic 26 db/ 16 db mute protection/ diagnostic 26 db/ 16 db mute protection/ diagnostic 26 db/ 16 db mute tab protection/ diagnostic 26 db/ 16 db sgnd svr acgnd pgnd1 11 (24) 13 (26) 15 (28) 12 (25) 16 (29) 2 (11) 1 (10) 26 (8) 23 (7) 21 (3) 7 (16) 5 (9) 18 (2) 20 (1) 10 (17) 8 (18) 6 (13) 4 (15) 27 (36) 22 (6) 24 (4) 14 (27) 17 (30) 9 (23) 3 (14) 19 (32) 25 (5) pgnd2 pgnd3 pgnd4 v p tdf8541
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 4 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 6. pinning information 6.1 pinning fig 2. pin configuration of types tdf8541j/sd (packages dbs27p and rdbs27p) tdf8541j/sd 001aan084 adsel stb pgnd2 out2- diag out2+ v p2 out1- pgnd1 out1+ svr in1 in2 sgnd in4 in3 a cgnd out3+ pgnd3 out3- v p1 out4+ scl out4- pgnd4 sda tab 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 5 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 3. pin configuration of type tdf8541th (package hsop36) tdf8541th n.c. out3- pgnd3 out3+ n.c. v p1 acgnd tab n.c. n.c. out4- in3 pgnd4 in4 out4+ sgnd scl in2 sda in1 diag svr adsel pgnd1 stb n.c. 001aan085 36 35 34 33 32 31 30 29 28 27 26 25 11 12 9 10 7 8 out2+ pgnd2 n.c. out2- n.c. v p2 24 23 22 21 15 16 13 14 n.c. out1+ n.c. out1- 20 19 17 18 5 6 3 4 1 2
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 6 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 6.2 pin description table 3. pin description symbol pin description tdf8541j/sd tdf8541th adsel 1 10 i 2 c-bus address select stb 2 11 stand-by (i 2 c-bus mode) or mode pin (legacy mode) programmable second clip indicator pgnd2 3 14 channel 2 power ground out2 ? 4 15 channel 2 negative output (right rear) diag 5 9 diagnostic and clip detection output out2+ 6 13 channel 2 positive output (right rear) v p2 7 16 power supply voltage 2 out1 ? 8 18 channel 1 negative output (right front) pgnd1 9 23 channel 1 power ground out1+ 10 17 channel 1 positive output (right front) svr 11 24 half supply voltage filter capacitor in1 12 25 channel 1 input in2 13 26 channel 2 input sgnd 14 27 signal ground in4 15 28 channel 4 input in3 16 29 channel 3 input acgnd 17 30 ac ground out3+ 18 2 channel 3 positive output (left front) pgnd3 19 32 channel 3 power ground out3 ? 20 1 channel 3 negative output (left front) v p1 21 3 power supply voltage 1 out4+ 22 6 channel 4 positive output (left rear) scl 23 7 i 2 c-bus clock input out4 ? 24 4 channel 4 negative output (left rear) pgnd4 25 5 channel 4 power ground sda 26 8 i 2 c-bus data input and output tab 27 36 heatsink connection; must be connected to ground n.c. - 12, 19, 20, 21, 22, 31, 33, 34, 35 not connected
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 7 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7. functional description the tdf8541 is a complementary quad btl audio power amplifier made with soi-based bcdmos technology. it contains four indepen dent amplifiers in a btl configuration; see figure 1 . the amplifier remains fully operational at a battery voltage as low as 6 v. below 6 v, a crank detector is activated to shut down the amplifier without audible plops. the tdf8541 is protected against overvoltage , short-circuit, overtemperature, open ground and open v p connections. the diagnostics for temperature and cl ip levels are programmable via the i 2 c-bus, and the information indicated at diagno stic pins diag and stb is selectable. the status of each amplifier can be read separately for output offset, load or no load, short-circuit or speaker falsely connected. during amplifier start-up the built-in start-up diagnostics can be used to detect shorted load, open load, short to ground or short to v p . the tdf8541 is software and hardware compatible with its predecessor: stand-alone amplifier tda8594 and tda8595. a resistor can be connected to pin adsel and ground to emulate an i 2 c-bus address that is determined by the resistor va lue. up to four different i 2 c-bus addresses are possible; see ta b l e 8 . if pin adsel is shorted to ground, the tdf8541 operates in legacy mode. in this mode, the i 2 c-bus is not needed and the function of pin stb changes from 2-level (stand-by mode and on mode) to a 3-level pin (stand-by mode, on mode and mute). the output stage of an amplifier channel c onsists of two pdmos power transistors and two ndmos transistors in btl configuration and ensures a high power output signal with perfect sound quality. the bcdmos process is used with an isolated soi substrate which ensures a robust amplifier, where latch-up cannot occur, and low crosstalk between the channels with every component isolated, without substrate currents. the input stage is biased (at 0.23 ? battery voltage + 1.4 v) and can accept an input voltage of up to 8 v (peak). the dc input bias voltage can be measured on pin svr. at a bias voltage of 0.23 ? battery voltage + 1.4 v (= 4.7 v at a supply of 14.4 v), the input capacitors can remain biased even with an engine start crank as low as 6 v. if the input capacitors are allowed to discharge quickly, a small input signal is caused by a different input time-constant due to a different ac ground and input capacitor. this small input signal would be amplified to the output resulting in an audible plop noise. 7.1 start-up and shut down sequence the capacitor on pin svr is used for smooth start-up and shut-down which prevents the amplifier from producing switch-on or -off plop noise. increasing the svr capacitor value increases start-up and shut-down time. if the amplifier is switched on in i 2 c-bus mode (ib1[d0] = 1) or in legacy mode (v stb > 2.5 v), the amplifier output voltage rises to 1.4 v below half the supply voltage and the output is muted. when the output reaches 1.4 v below half the supply voltage, the start-up mute is released if the i 2 c-bus was set to unmute (v stb > 5.9 v in legacy mode), or stays in mute if the bits are set to mute (2.5 v < v stb < 4.5 v in legacy mode). to enable short start-up times, the 70 k ? input resistor is reduced to 3 k ? during start-up until just before the start-up mute release.
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 8 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier during start-up, the ampifier cannot distinguish between a short to ground or a speaker fault. if there is a speaker fault during start-up, the amplifier enters protection mode and switches off that channel. if the amplifier starts and a speaker fault occu rs (double-fault condition, one side of the speaker connected to ground and one side connected to one output), the amplifier only sets the speaker fault detection bits. if the amplifier is switched off by i 2 c-bus (ib1[d0] = 0) the soft mute is activated and the capacitor on pin svr is discharged. if the amplifier is switched off in legacy mode, pin stb must be set to mute for 50 ms to ensure a low switch-off plop and then pin stb can be set to ground which discharges the svr capacitor. if the amplifier is swit ched off by pulling pin stb low, th e amplifier is muted (fast mute) and then the capacitor on pin svr is discharged. this fast mute can be used in i 2 c-bus and legacy mode, when for instance an external engine start detection is used. fig 4. start-up and shut-down in i 2 c-bus mode t wake t d(fast-mute) t d(mute-off) t off t amp-on v p diag stb svr amplifier output db2 [d7] por ib1 [d0] start enable 001aam685
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 9 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.2 engine start and low voltage operation the voltage on pin svr acts as a reference voltage for the input bias (set to 0.23 ? battery voltage + 2 ? diode voltage v be ) and as a reference for generating the filtered half supply voltage at the amplifier output. the capacitor connected to pin svr improves supply voltage ripple rejection and channel separation between the four channels. the dc output voltage relates to the svr voltage to prevent common mode ripple on the speaker lines. if the supply voltage drops during an engine start, the output follows slowly due to the svr capacitor. to enable suffici ent headroom for the output signal below a battery voltage of 10 v, the dc-output voltage di rectly follows the half supply voltage. this ensures that at low supply voltage the undistorted output power is maximized. if the battery voltage is above 10 v, the dc-output voltage relates to the svr voltage and is filtered again for supply ripple; see figure 6 . the dc input voltage follows the supply volt age slowly, due to the svr capacitor, to prevent audible plops, even during engine start. if the battery voltage dr ops below 6 v, the low v p mute is activated. during low v p mute, the amplifier is fast muted (about 400 ? s). when mute is completed, the capacitors on pin acgnd and pin svr are discharged to prevent audible plops. if the battery rises again above the low v p mute threshold (6 v), and a power-on reset (por) (db2[d7] = 1) is not detected, the amplifier starts automatically. the amplifier restart only occurs if the svr capacitor has been discharged to 0.7 v to prevent a start-up plop. if the battery voltage has dropped too mu ch that the internal registers lose their fig 5. start-up and shut-down in legacy mode soft mute fast mute t off t d(fast-mute) t d(mute-on) t d(mute-off) t amp-on t d(soft-mute) v p diag stb on mute standby svr amplifier output por 001aam686
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 10 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier information, a por occurs and the amplif ier will not restart automatically. in i 2 c-bus mode, pin diag is pulled low to indicate a por has occurred. in legacy mode, the amplifier restarts if pin stb remains high. the device prevents amplifier plops during engi ne start. to prevent plops on the amplifier output caused by, for instance, a tuner regulator out of regulation, the voltage on pin stb can be made zero when an engine start is detected. pin stb activates the fast mute, suppressing disturbances at the amplifier inputs. the built-in low battery voltage mu te is the default, and in lega cy mode is set to 5.5 v, but can also be set to 7.2 v via the i 2 c-bus. if the low battery volt age mute is set to 7.2 v, the amplifier activate s fast mute (400 ? s) and enters the same cycle when the low v p mute was set to 5.5 v: discharge of the acgnd and svr capacitors when the mute is completed and start-up when the supply voltage is above 8 v, when no por has occurred. 7.3 power-on reset and supply voltage spikes if in i 2 c-bus mode the supply voltage drops below 4.5 v, the content of the i 2 c-bus latches cannot be guaranteed and por is activated at a typical v p level of 3.1 v. all latches are reset, the amplifier is switched off and pin di ag is pulled low to indicate that a por has occurred; see db2[d7]. if ib1[d0 ] is set, the power-on flag is reset, pin diag is released and the amplifier starts. in legacy mode a supply voltage drop below 6 v switches off the amplifier. when the supply vo ltage is above 6 v the amplifie r restarts if pin stb is still enabled. 7.4 protection 7.4.1 output protection and short-circuit protection if a short-circuit to ground, to v p or across the load occurs on one or more amplifier outputs, only the channel wit h the short will be switched of f. the channel that has a short-circuit and the type of short-circuit can be read via the i 2 c-bus. if pin diag is enabled for load fault information (ib2[d4] = 0) pin diag is pulled low. the window protection prevents a restart of the channel with a short to ground or v p . with a short across the load the channel is switched on again after 15 ms to check if the short across the load is still present. if the short-circuit conditions ar e still present, the channel is fig 6. engine start protection amplifier re-start (depends on i 2 c-bus content) t (s) 001aam687 v p voltage (v) 14 10 7 6 3.5 uvp dc output voltage svr voltage/dc input voltage t (start-vo(off)) t (start-svroff) dc voltage output not filtered to ensure headroom svr clamp voltage
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 11 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier switched off. if several channels have a sh ort across the load at the same time, the channels are switched on one by one to prevent high supply current switching with four shorts across the load at the same time. the 15 ms cycle reduces power dissipation. to prevent audible distortion, the channel wit h the short can be disabled via the i 2 c-bus. 7.4.2 loss-of-ground/loss of v p loss-of-ground/loss of v p is a double fault condition: the ground (or v p ) wire of the set is not connected and the ground (or v p ) wire is connected to one of the loudspeaker outputs. in this situation the supply capacitor in the set is charged through the body diode of the output power transistor. this body diode (between the drain and source of the power transistor) is always present in amplifiers with mos output stages. the capacitor charge current depends on the series im pedance of the supply lines, the output impedance of the loss-of-ground tester and the value of the capacitor; see figure 7 . to simulate a worst-case condition, the loss- of-ground tester is equipped with a buffer capacitor of 116 mf to simulate a very low output impedance. with a r s of 63 m ? , peak currents of more than 70 a have been measured. (1) capacitor can be 2200 ? f to 10000 ? f. (2) amplifier output stage. fig 7. test circuit fo r loss-of-ground test c buffer 116 mf nmos 80n03l v p r s 2200 f v pulse (1) (2) 5 7 9 17 19 21 23 3 001aam695 loss-of-ground tester dut in application
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 12 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.4.3 speaker fault detection there are two protection features available to prevent damage to the speaker if one side of the speaker is connected to ground. ? a check for a speaker fault operates during st art-up. this is included in the check for a short to ground; the channel that has the speaker fault is switched off. if the short to ground bit is set, it can mean either a short to ground or a speaker fault. at start-up it is difficult to distinguish between a speaker fault and a short to ground. the amplifier is protected against both, but the s peaker fault bit is not always set. ? a check for a speaker fault opera tes continuously. if a speaker fault is detected, bit d6 in registers db1 to db4 are set but the amp lifier is not switched off and pin diag is not pulled low. 7.4.4 overvoltage warning and load dump protection if the battery voltage v p exceeds the maximum value of v th(ovp) , the device switches off the output stages of the amplifier to prot ect the output transistors. the overvoltage pre-warning bit is set when the supply voltage level exceeds the value of v p(ovp)pwarn . the functionality of the diagnos tic output can be chosen in i 2 c-bus mode. in this mode the pre-warning information can become visible at the diagnostic output. in legacy mode, pin diag will not be activated und er pre-warning conditions. although the amplifier switches off the outp ut stages, the device remains operational during load dump conditions (maximum value of v p at load dump protection; duration 50 ms, rise time > 2.5 ms). the occurrence of th e load dump situation can last for a longer period of time without damaging the device. provided that the i 2 c-bus supply is within the levels specified, communication with the i 2 c-bus bus during load dump situations remains possible and the status of the channel outputs can be read. (1) amplifier output stage. fig 8. test circuit for loss-of-v p test c buffer 116 mf v p r s 2200 f pmos irf5305 v pulse 5 7 9 17 19 21 23 3 001aao146 loss-of-v p tester dut in application (1)
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 13 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.4.5 thermal pre-warning and thermal protection if the average junction temperature reaches one of the adjustable levels set via the i 2 c-bus, selected with ib3[d4], pr e-warning is activated resulting in pin diag low (if selected) and can be read via the i 2 c-bus. the default setting for the thermal pre-warning is ib3[d4] = 0 setting the warning level at t j(av)(pwarn) = 160 ? c. in legacy mode the thermal pre-warning is also set at t j(av)(pwarn) = 160 ? c. if the temperature increases further, the temper ature-controlled gain reduction is activated for all four channels to reduce the output power; see figure 9 . if this does not reduce the average junction temperature, all four chan nels are switched off at the absolute maximum temperature t off . 7.5 diagnostics diagnostic information can be read via the i 2 c-bus, but can also be made available at pin diag or pin stb. pin diag indicates inform ation such as por occurred, low battery, and high battery; the output load fault information is selectable via the i 2 c-bus. this information is seen at pin diag as a logica l or. in case of a failure, pin diag remains low and the microcontroller can read the failure information via the i 2 c-bus; pin diag can be used as a microcontroller interrupt to minimize i 2 c-bus traffic. when the failure is removed, pin diag is released. to enable full control over the clipping information, pin stb can be programmed as a second-clip detection pin. the clip detection le vel can be selected for all channels at once. the clip information can be selected to be ava ilable separately at pin diag or at pin stb for each channel. it is possible, for instance , to distinguish between clipping of the front and the rear channels. the diagnostic information available at either of the two diagnostic pins diag and stb is shown in ta b l e 4 . fig 9. temperature controlled amplifier gain 001aam696 10 20 30 g (db) 0 t j (c) 140 190 180 160 170 150
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 14 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.5.1 start-up diagnostics with dc load detection if the start-up diagnostics are enabled, the load condition of all four channels is determined. at the end of the start-up diagnostics cycle, not only the load condition is known (shorted load, normal load or open load), but also if a separate amplifier is connected or if the outputs are shorted to battery or ground. if a separate amplifier (booster) is detected, the amplifier can start-up in line driver mode (low gain setting). the load diagnostic is insensit ive to door-slam (slowly moving speaker due to slamming of the car door) and to external interference su ch as crosstalk of relays switching in the wiring harness; see figure 10 . table 4. diagnostic information on pins diag and stb diagnostic information i 2 c-bus mode legacy mode diag pin stb pin diag pin power-on reset (por) after por, pin diag remains low until amplifier starts (inverse of start-up bit) no no low battery yes no yes clip detection can be enabled per channel; can be enabled by ib1[d7] if below v p =10v; default is ?blocked? can be enabled per channel; can be enabled by ib1[d7] if below v p =10v; default is ?blocked? yes; fixed level for all channels at 2 %; blocked for v p < 10 v temperature pre- warning can be enabled; default: t j(av)(pwarn) = 160 ? c no yes, pre-warning level is t j(av)(pwarn) = 160 ? c short can be enabled; default is enabled no yes speaker fault detection no no no offset detection no no no load detection no no no overvoltage protection (20 v) yes no yes overvoltage pre-warning (16 v) can be enabled; default is disabled no no maximum temperature protection (active) yes no yes start-up diagnostics indication no no no
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 15 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier the load detection values are shown in figure 11 . if only 4 ? speakers are connected, the low gain mode can be selected during the start-up diagnostics. a shorted load is indicated until an impedance of 1.5 ? is reached. even ?soft? shorts in the wiring harness will be detected. fig 10. principle of start-up diagnostics fig 11. start-up diagnosti cs load detection levels (1) first stage: open load/load/line dr iver load; short across the load. (2) second stage: amplifier start plus short to ground/v p ; speaker fault. fig 12. start-up with start-up diagnostics comparators spike filter door-slam processor offset generator i 2 c-bus bits load condition 001aam697 out + out ? shorted normal line driver open 0.5 1.5 high gain low gain 1.5 3.2 20 20 80 80 200 200 400 400 001aaam698 001aam699 aon a amon 2 1 11 n on ano na am o
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 16 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier in the first stage an offset is generated across the load. to avoid switch-on plop-noise the offset is increased after 15 ms. the measurement cycle lasts for t sudiag . after 15 ms the offset across the load is reduced. the offset is generated with resi stors instead of the amplifier to avoid plop-noise during engine start. if the offset is removed quickly, audible plop can occur during periods without audio. if the voltage of the outputs is more than 3.5 v during the first stage, the start-up diagnostic is switched off to avoid damage to the amplifier. this can happen with a door slam or with a short to v p . if a short to v p is applied, the short ed channel will report not valid after the first stage. if only 1 or 2 channels report not valid after the first stage, a short to v p of those channels can be assumed. if all 4 channels report not valid, under- over - voltage, a start-up diagnostic cycle can be assumed. the start-up diagnostics has a built-in spike filter to remove disturbances caused by switching relays in the wiring harness or emc. the door-slam processor filters out disturbances caused when the car door closes : car door-slam can cause the speakers to move slowly which disturbs the measurement. with these filter techniques, reliable load detection is performed in a single start-up diagnostics cycle. the start-up diagnostics can be repeated. only the first stage, where the speaker load is determined, is sensitive to disturbance and needs to be repeated. when the start-up diagnostics start, the invalid bit is set, and ?start-up diag busy bit? (tdf8541 bit db5[d5]) indicates that the start-up diagnostics are not completed. when the start-up is completed, or interrupted by a por, the ?start-up diag busy bit? is reset. there are two possible situations: ? the start-up diagnostics are enabled (ib1[d1] = 1) and the amplifier start is not enabled (ib1[d0] = 0), bit ?start-up diag busy bit? is reset when the start-up diagnostics are completed, and the i 2 c-bus data bits are set. toggling the start-up diagnostics bit re-starts the start-up diagnostic. the invalid bits are set and bit ?start-up diag busy bit? indicates that the start-up diagnostics are not completed. ? the start-up diagnostics are enabled (ib1[d1] = 1) and the amplifier start is enabled (ib1[d0] = 1). after the first start-up diagnostic cycle has finished, the amplifier starts and when start-up is completed, just before the start-up mute release (dc output voltage is 1.4 v below midtap voltage), bit ?start-up diag busy bit? indicates that the startup diagnostic is completed. it is not necessary to toggle the start-up diagnostics and has no purpose. the first and second stages of the start-up diagnostics can be repeated: start-up with the st art-up diagnostics (ib1[d1] = 1 and the amplifier start enabled (ib1[d0] = 1). wait until db5[d5] = 0 which indica tes that the start-up diagnostics cycle is completed. read the start-up diagnostics information. shut down the amplifier by making the start-up bit logic 0. when db5[d0] = 0, the amplifier is completely shut down and a new start-up cycle can be programmed.
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 17 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier [1] dbx[d3] indicates a shorted load; dbx[d1] indicates a short to v p ; dbx[d0] indicates a short to ground. when set, d4, d5 have no meaning. if during the start-up diagnostics an engine st art occurs, the generated offset to measure the dc load is reduced and the start-up diagnos tics cannot be performe d correctly. in this case the invalid combination dbx[d4:d5] = 11 is set. the start-up diagnostics information in the i 2 c-bus bits is combined with the ac load detection allowing the start-up diagnostics information to be read when ib4[d4] = 0. if ib4[d4] = 1, the stored start-up diagnostics information bits cannot be read but they will not lose their value. remark: the shorted load, and short to v p or ground information from the start-up diagnostics is cleared after an i 2 c-bus read. this indicates the real situation: when the short is removed, the bits are cleared. t he dbx[d5] and dbx[d4] in formation, generated at start-up, is refreshed after a new start-up diagnostics cycle. 7.5.2 dc offset detection the offset detection can be performed with no input signal (for instance when the dsp is muted after a start-up) or with an input signal. if in i 2 c-bus mode an i 2 c-bus read of the output offset is performed, the i 2 c-bus dbx[d2] latches are set. if the amplifier btl output voltage is within a window with a threshold of 1.3 v (typical), the dbx[d2] latches are reset and their setting is disabled. if for example, after 1 s another i 2 c-bus read is performed and the offset bits are still set, the output did not cross the offs et threshold during the last 1 second; see figure 13 . this can mean either a frequency below 1 hz was applied (1 s i 2 c-bus read interval) or an output offs et of more than 1.3 v is present. table 5. start-up diagnostics i 2 c-bus bits dc load bits [1] meaning dbx[d5] dbx[d4] 0 0 normal load 0 1 line driver mode 1 0 open load 1 1 invalid: overvoltage or undervoltage (v p <10v) has occurred, or start-up diagnostics not completed, or channel has short to v p ; indicated in second stage
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 18 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.5.3 ac load detection the ac load detection, set with ib1[d2] = 1, is used to detect if ac-coupled speakers such as tweeters are connected correctly. the detection requires a 19 khz sine wave to be applied to the inputs of the amplifier. a high current ac-load detection mode can be selected, for example during car assembly, or a low current ac-load detection mode, for example during switch on of car radio. th e output voltage over the load impedance generates an amplifier current. if the amplifier peak current triggers 4 times a 500 ma (peak) threshold (or 275 ma (peak) in low curr ent mode), the ac-load detection bit is set. the 4 ?threshold cross? counter is used to prevent false ac-load detection caused by switching the input signal on or off. an ac-coupled speaker reduces the impedance at the output of the amplifier in a certain frequency band. the presence of an ac-coupled speaker can be determined using a high current mode (ib4[d1] = 1, see figure 14 ) or using a low current detection mode (ib4[d1] = 0; see figure 14 . if, for instance, a 19 khz input signal is ge nerated with a peak output voltage of 2 v the i 2 c-bus bits are guaranteed to be set with a total ac + dc load less than 4 ? and are guaranteed not set with a load of more than 9 ? ; see figure 14 . the interpretation of the line driver and amplifier mode dc load bit for ac load detection is shown in ta b l e 6 . fig 13. offset detection 001aam700 reset, setting disabled offset threshold time v o = (out+ - out-) offset threshold time read set bit 1 second: read offset, dbx[d2] set 1 second: read no offset, dbx[d2] reset v o = (out+ - out-)
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 19 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier if ib1[d2] = 1 the ac-load detection measurement cycle is enabled, the peak counter is reset and the measuring cycle starts. the ac-load detection is only performed after the amplifier has completed its start-up cycle. since the ac-load information in the i 2 c-bus bits is combined with the start-up diagnostics, the ac-load information can be read when ib4[d4] = 1. if ib4[d4] = 0, the stored ac-loa d bits cannot be read, but their values are preserved. table 6. ac load detection ib4[d4] = 1 db1 to 4 [d4] (ac load bit) no ac load detected 0 ac load detected 1 fig 14. ac load impedance as a function of peak output voltage (high current ac-load detection) fig 15. ac load impedance as a function of peak output voltage (low current ac-load detection) 001aam701 v om (v) 06 4 2 10 15 5 20 25 z l () 0 trip level load detected, l 2 c-bus bits set no load detected, l 2 c-bus bits not set 001aam702 o 06 4 2 20 30 10 40 50 0 oa 2 no oa 2 no
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 20 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.5.4 distortion clip detection if the amplifier output starts clipping at the supply voltage or ground, the output signal becomes distorted. if the distortion per channel exceeds a selectable threshold (2 %, 5 % or 10 %), either pin diag or pin stb is activa ted. to be able to detect if, for instance, the front channels (channels 1 and 3) or rear channels (channels 2 and 4) are clipping, the clip information per channel can be dire cted to either pin diag or pin stb. it is possible to only have th e clip information on the diagnostic pins by disabling the temperature- and load information on pin diag. the temperature and load protection are still functional but can only be read via the i 2 c-bus. the clip detection level can be programmed via the i 2 c-bus. the clip information is blocked below a supply voltage of 10 v to avoid false clip detection during engine start, or can be programmed to operate at the low voltage detection level of 7.5 v or 6 v. since it is possible to have different amplif ier gain settings between the front and rear channels and there is only one clip reference current, the clip detect levels are only accurate for the channels with the highest gain . in line driver mode the dc-output voltage is 0.23v p and clip detection will still indicate a clip, but the levels will not be accurate. 7.6 line driver mode and low gain mode the tdf8541 can be used as a line driver or as a low gain amplifier. in both situations, the gain needs to be set to 16 db via the i 2 c-bus (ib3[d5:d6] and can be independently set for the front (channels 1 and 3) and rear (channels 2 and 4). the main difference between line driver mode and low gain mode is the dc output voltage. in line driver mode the tdf8541 is used to drive a separate amplifier or booster. in this mode the dc output voltage is set to 0.23 ? battery voltage and is filtered with the capacitor connected to pin svr (same as v svr ). the reason not to set the dc output voltage to half the battery voltage is to allo w engine starts at a battery voltage as low as 6 v. the dc output voltage remains approximately 3 v during engine start. if the dc output voltage is set to half the battery voltage, with an engine start the common mode voltage will change quickly from 7 v to 3 v. th is drives the input stage of the booster below the ground level. if the tdf8541 is used as a low gain amplifier in a booster, the dc output voltage is set to half of the supply voltage to ensure maximum undistorted output power. the line driver and low gain modes can be selected with i 2 c-bus bit ib4[d2]. [1] x = neither mode selected. table 7. dc output voltage as a function of different gain settings channels 1 and 3 gain setting (db) channels 2 and 4 gain setting (db) line driver/low gain mode ib4[d2] [1] all channels dc output voltage (v) 26 26 x 0.5v p 16 26 x 0.5v p 26 16 x 0.5v p 16 16 low gain mode 0.5v p 16 16 line driver mode 0.23v p
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 21 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 7.7 i 2 c-bus, legacy mode and address select pin pin adsel can select either of two amplifier modes: legacy mode or i 2 c-bus mode. 7.7.1 address select (pin adsel) the following amplifier functions are selected with pin adsel: ? pin adsel shorted: (r adsel < 470 ? ) legacy mode, no i 2 c-bus communication is needed. ? resistor connected between pin ad sel and ground: where different i 2 c-bus addresses can be sele cted with resistors. ? one i 2 c-bus address can be selected by either forcing a voltage on pin adsel or by connecting a high ohmic resistor between pin adsel and v p . to avoid address changes during low supply volt age, the address selected by the value of resistor connected to pin adsel is latche d at voltages below 6 v. the consequence is, during start-up and after every power-on reset, the supply voltage must be above 6 v otherwise the address is invalid. 7.7.2 legacy mode (r adsel < 470 ? ) the function of pin stb changes from off/opera ting to off/mute/operating and the amplifier starts immediately when pin stb is put into mute or operating mode. mute operating is controlled via an internal timer (15 ms) to minimise mute-on plops. when pin stb is switched directly from operating to off, first the hard mute is activated (switching to mute within 400 ? s) and then the amplifier shuts down. to have a plop-free shut-down, first pin stb should be switched to mute for 50 ms and then switched off. 7.7.3 i 2 c-bus mode if pin stb is low, the total quie scent current is low, and the i 2 c-bus lines are not loaded. when pin stb is switched high, the tdf8541 enters operating mode and performs a por which makes pin diag low. the tdf854 1 starts when ib1[d0] = 1. bit d0 also resets the ?power on reset occurred? bit (db2[d7]) and releases pin diag. soft mute and hard mute can be activated via the i 2 c-bus. soft mute can be activated independently for the front (channels 1 and 3) and rear (channels 2 and 4), and mutes the audio in 15 ms. hard mute activates the mute for all channels at the same time and mutes the audio in 400 ? s. unmuting after a hard mute will be a soft unmute of approximately 15 ms. when pin stb is switched to off mode, and the amplifier has started, first the hard mute is activated and then the amplifier s huts down. it is possible to fully mute the amplifiers within 400 ? s by making pin stb low, for example during an engine start. 7.7.4 i 2 c-bus diagnostic bits read-out/cleared after read the amplifier?s diagnostic information can be read via the i 2 c-bus. the i 2 c-bus bits are set if a failure occurs and are reset by the i 2 c-bus read command (cleared after read). when the failure is removed, the microcontroller knows the cause of the failure by reading the i 2 c-bus. the consequence of this procedure is that old information is read during the i 2 c-bus read. most real information will be gathered within tw o consecutive read commands.
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 22 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier cleared after read means that the i 2 c-bus bits are cleared after a read command. the clear command is done only if all five data bytes are read. if only four data bytes are read, the i 2 c-bus latches are not cleared and the old value remains in the latches. when selected, pin diag gives actual diagnost ic information. if a failure is removed, pin diag is released instantly, independently of the i 2 c-bus latches. 7.8 amplifier combined with a dc-to-dc converter the tdf8541 can be used in combination wit h a dc-dc up-converter as the supply for the amplifier (connected to v p ). if the dc-dc converter out put voltage is controlled with the audio signal, the amplifier?s dissipation can be reduced at lower output powers. to ensure that the amplifier can follow supply voltage variations, the supply voltage ripple capacitor connected to pin svr, to filter the amplifier?s common mode output voltage, must be disconnected internally. the svr capacitor is st ill used to determine the dc input voltage. if i 2 c-bus bit ib4[d7] = 1, the common mode output voltage directly follows the supply voltage variations. 8. i 2 c-bus specification table 8. tdf8541 hardware address select pin adsel a6 a5 a4 a3 a2 a1 a0 r/w hex remark open 11011000 = write to tdf8 541; 1 = read from tdf8541 d8 reserved; instruction and data bytes have other meaning 100 k ??? 1% 1 0 dc - 30 k ? ? 1% 1 1 de - 10 k ? ? 1% 010 d4 - voltage > 4 v 1 0 1 da - ground no i 2 c-bus; legacy mode - fig 16. definition of start and stop conditions 001aam703 sda scl p stop condition s start condition sda changes when scl is high: start ? or stop condition
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 23 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 8.1 i 2 c-bus instruction bytes i 2 c-bus mode: ? if r/w bit = 0, the tdf8541 expects four instruction bytes; ib1, ib2, ib3, ib4 ? after a power-on reset, all instruction bits are set to zero legacy mode: fig 17. bit transfer 001aam704 data line stable; data valid change of data allowed sda scl fig 18. i 2 c-bus read and write modes 001aam705 ack msb msb ? 1 msb msb ? 1 lsb + 1 lsb lsb + 1 12 78912 789 12 78912 789 : generated by master (microcontroller) to stop the transfer, after the last acknowledge (a) a stop condition (p) must be generated to stop the transfer, the last byte must not be acknowledged and a stop condition (p) must be generated : generated by slave : start : stop : acknowledge : read / write s p a r/w scl sda scl sda ack ack msb msb ? 1 msb msb ? 1 lsb + 1 lsb lsb + 1 ack sa a ap ap address write data read data w s address r i 2 c-bus write i 2 c-bus read
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 24 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier ? all bits equal to zero define the setting, with the exception of bit ib1[d0] which is ignored; see ta b l e 9 . table 9. instruction byte ib1 bit description d7 enable or disable clip detection below v p = 10 v 0 = disable clip detection below v p = 10 v 1 = enable clip detection below v p = 10 v d6 channel 3 clip information on pin diag or pin stb 0 = clip information on pin diag 1 = clip information on pin stb d5 channel 1 clip information on pin diag or pin stb 0 = clip information on pin diag 1 = clip information on pin stb d4 channel 4 clip information on pin diag or pin stb 0 = clip information on pin diag 1 = clip information on pin stb d3 channel 2 clip information on pin diag or pin stb 0 = clip information on pin diag 1 = clip information on pin stb d2 enable or disable ac load detection 0 = ac load detection disabled 1 = ac load detection enabled d1 enable or disable start-up diagnostics 0 = start-up diagnostics disabled 1 = start-up diagnostics enabled d0 enable or disable amplifier start 0 = amplifier start not enabled 1 = amplifier start enabled table 10. instruction byte ib2 bit description d7 and d6 clip detection level 00 = clip detection level 2 % 01 = clip detection level 5 % 10 = clip detection level 10 % 11 = clip detection level disabled d5 temperature information on pin diag 0 = temperature information on pin diag 1 = no temperature information on pin diag d4 load fault information (shorts) on pin diag 0 = load fault information on pin diag 1 = no load fault information on pin diag d3 -
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 25 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier d2 soft mute channel 1 and channel 3 0 = soft mute disabled 1 = soft mute enabled (mute delay 15 ms) d1 soft mute channel 2 and channel 4 0 = soft mute disabled 1 = soft mute enabled (mute delay 15 ms) d0 fast mute all amplifier channels 0 = fast mute disabled 1 = fast mute enabled table 11. instruction byte ib3 bit description d7 - d6 amplifier channel 1 and channel 3 gain select 0 = 26 db 1 = 16 db d5 amplifier channel 2 and channel 4 gain select 0 = 26 db 1 = 16 db d4 temperature pre-warning level 0 = warning level at t j(av)(pwarn) = 160 ? c 1 = warning level at t j(av)(pwarn) = 135 ? c d3 enable or disable channel 3 0 = channel 3 enabled 1 = channel 3 disabled d2 enable or disable channel 1 0 = channel 1 enabled 1 = channel 1 disabled d1 enable or disable channel 4 0 = channel 4 enabled 1 = channel 4 disabled d0 enable or disable channel 2 0 = channel 2 enabled 1 = channel 2 disabled table 12. instruction byte ib4 bit description d7 common-mode voltage filtered by svr capacitor 0 = filter common-mode voltage 1 = dc-to-dc converter connected (svr ca pacitor not used to filter common-mode voltage) table 10. instruction byte ib2 ?continued bit description
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 26 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier d6 soft or fast mute select during shut-down via pin stb 0 = activate fast mute during shut-down 1 = activate slow mute during shut-down d5 16 v overvoltage warning on pin diag 0 = 16 v overvoltage warning on pin diag disabled 1 = 16 v overvoltage warning on pin diag enabled d4 ac or dc load information on bits dbx[d5:d4] 0 = dc load information on bits dbx[d5:d4] 1 = ac load information on bits dbx[d5:d4] d3 - d2 line driver mode or low gain mode selection 0 = line driver mode; common-mode output voltage is 0.23 ? v p 1 = low gain mode; common-mode output voltage is 0.5 ? v p ; only valid for channels when gain is set to 16 db d1 ac load detection measur ement current selection 0 = ac load detection; low measurement current 1 = ac load detection; high measurement current d0 low v p mute undervoltage level setting 0 = low v p mute undervoltage level set to 5.5 v 1 = low v p mute undervoltage level set to 7.2 v table 12. instruction byte ib4 ?continued bit description
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 27 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 8.2 i 2 c-bus data bytes i 2 c-bus mode: ? if r/w = 1, the tdf8541 sends data bytes to the microprocessor ? all bits are reset after a read operation except dbx[d4] and dbx[d5] in db1 to db4. bit dbx[d2] in db1 to db4 is set after a read operation; see section 7.5.1 and section 7.5.2 . ? for explanation of ac and dc load detection bits, see section 7.5.3 remark: data bits are only reset (cleared after read) after reading 5 data bytes. table 13. data byte db1 bit description d7 temperature pre-warning 0 = no temperature pre-warning 1 = temperature pre-warning has occurred d6 speaker fault channel 2 0 = no speaker fault, channel 2 1 = speaker fault, channel 2 d5 and d4 channel 2 dc-load or ac-load detection if bit ib4[d4] = 1, ac-load detection is enabled, bit d5 does not care, bit d4 has the following meaning: 0 = no ac-load 1 = ac-load detected if bit ib4[d4] = 0, ac-load detection is disabled, bits d5 and d4 are available for dc-load detection 00 = normal load 01 = line driver load 10 = open load 11 = not valid d3 channel 2 shorted load 0 = no shorted load 1 = shorted load d2 channel 2 output offset 0 = no output offset 1 = output offset d1 channel 2 short to v p 0 = no short to v p 1 = short to v p d0 channel 2 short to ground 0 = no short to ground 1 = short to ground
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 28 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier remark: data bits are only reset (cleared after read) after reading 5 data bytes. table 14. data byte db2 bit description d7 por and amplifier status 0 = por disabled; amplifier enabled 1 = por has occurred; amplifier disabled d6 speaker fault channel 4 0 = no speaker fault 1 = speaker fault, channel 4 d5 and d4 channel 4 dc-load or ac-load detection if bit ib4[d4] = 1, ac-load detection is enabled, bit d5 does not care, bit d4 has the following meaning: 0 = no ac-load 1 = ac-load detected if bit ib4[d4] = 0, ac-load detection is disabled, bits d5 and d4 are available for dc-load detection 00 = normal load 01 = line driver load 10 = open load 11 = not valid d3 channel 4 shorted load 0 = no shorted load 1 = shorted load d2 channel 4 output offset 0 = no output offset 1 = output offset d1 channel 4 short to v p 0 = no short to v p 1 = short to v p d0 channel 4 short to ground 0 = no short to ground 1 = short to ground table 15. data byte db3 bit description d7 maximum temperature protection 0 = no protection 1 = maximum temperature protection d6 speaker fault channel 1 0 = no speaker fault, channel 1 1 = speaker fault, channel 1
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 29 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier remark: data bits are only reset (cleared after read) after reading 5 data bytes. d5 and d4 channel 1 dc-load or ac-load detection if bit ib4[d4] = 1, ac-load detection is enabled, bit d5 does not care, bit d4 has the following meaning: 0 = no ac-load 1 = ac-load detected if bit ib4[d4] = 0, ac-load detection is disabled, bits d5 and d4 are available for dc-load detection: 00 = normal load 01 = line driver load 10 = open load 11 = not valid d3 channel 1 shorted load 0 = no shorted load 1 = shorted load d2 channel 1 output offset 0 = no output offset 1 = output offset d1 channel 1 short to v p 0 = no short to v p 1 = short to v p d0 channel 1 short to ground 0 = no short to ground 1 = short to ground table 16. data byte db4 bit description d7 power supply 16 v overvoltage warning 0 = no overvoltage warning 1 = overvoltage warning occurred d6 speaker fault channel 3 0 = no speaker fault 1 = speaker fault table 15. data byte db3 ?continued bit description
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 30 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier remark: data bits are only reset (cleared after read) after reading all 5 data bytes. d5 and d4 channel 3 dc-load or ac-load detection if bit ib4[d4] = 1, ac-load detection is enabled, bit d5 does not care, bit d4 has the following meaning: 0 = no ac-load 1 = ac-load detected if bit ib4[d4] = 0, ac-load detection is disabled, bits d5 and d4 are available for dc-load detection: 00 = normal load 01 = line driver load 10 = open load 11 = not valid d3 channel 3 shorted load 0 = no shorted load 1 = shorted load d2 channel 3 output offset 0 = no output offset 1 = output offset d1 channel 3 short to v p 0 = no short to v p 1 = short to v p d0 channel 3 short to ground 0 = no short to ground 1 = short to ground table 17. data byte db5 bit description d7 power supply undervoltage 0 = no undervoltage 1 = undervoltage occurred d6 power supply overvoltage 0 = no overvoltage 1 = overvoltage has occurred d5 system status with start-up di agnostics or amplifier start-up [1] 0 = system not busy 1 = system busy d4 v p below/above 7.5 v 0=v p above 7.5 v 1=v p has dropped below 7.5 v table 16. data byte db4 ?continued bit description
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 31 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier [1] bits db5[d0] and [d5] are not latched/cleared af ter being read. they indicate the actual value. remark: data bits are only reset (cleared after read) after reading all 5 data bytes. 9. limiting values d3 v p below above 10 v 0=v p above 10 v 1=v p has dropped below 10 v d2 undervoltage protection 0 = no undervoltage protection occurred 1 = undervoltage protection occurred (engine start) d1 - d0 amplifier and output stage status [1] 0 = amplifier switched off, output stage high impedance 1 = amplifier switched on, output stage active table 17. data byte db5 ?continued bit description table 18. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit v p supply voltage operating 6 18 v non-operating ? 1+50v load dump protection; duration 50 ms, rise time > 2.5 ms -50v v p(r) reverse supply voltage 10 minutes maximum - ? 2v i osm non-repetitive peak output current -13a i orm repetitive peak output current -8a t j(max) maximum junction temperature -150 ?c t stg storage temperature ? 55 +150 ?c t amb ambient temperature heatsink of sufficient size to ensure t j does not exceed 150 ?c ? 40 +105 ?c v (prot) protection voltage ac and dc short-circuit voltage of output pins and across the load -v p v v i(max) maximum input voltage rms value; before capacitor; r s = 100 ? -5v
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 32 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier [1] 10 k ? series resistance if connected to v p . [2] human body model (hbm): all pins have passed all tests to 2500 v to guarantee 2000 v, according to class ii. [3] charged-device model (cdm). 10. thermal characteristics 11. characteristics v x voltage on pin x scl and sda 0 6.5 v svr, acgnd and diag 010v stb [1] 024v p tot total power dissipation t case =70 ?c- 8 0 w v esd electrostatic discharge voltage hbm; c = 100 pf; r s =1.5k ? [2] - 2000 v cdm [3] corner pins - 750 v non-corner pins; except pin 24 (svr) version th only -500v pin 24 (svr) version th only -400v table 18. limiting values ?continued in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit table 19. thermal characteristics symbol parameter conditions typ unit dbs27/rdbs27 r th(j-c) thermal resistance from junction to case 1.15 k/w r th(j-a) thermal resistance from junction to ambient 40 k/w hsop36 r th(j-c) thermal resistance from junction to case 1.15 k/w r th(j-a) thermal resistance from junction to ambient 35 k/w table 20. characteristics refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit supply voltage behavior v p(oper) operating supply voltage r l = 4 ? 614.418v r l = 2 ? 614.416v i q quiescent current no load - 260 350 ma no load; v p = 7 v - 190 - ma
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 33 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier i off off-state current v stb = 0.4 v - 4 10 ? a v o output voltage dc; amplifier on; high gain/low gain mode 6.67.17.6v dc; line driver mode; ib4[d2] = 0; ib3[d5] = [d6] = 1 3.03.43.8v v p(low)(mute) low supply voltage mute rising supply voltage ib4[d0] = 1 7.0 7.7 8.1 v ib4[d0] = 0 5.4 5.7 6.2 v falling supply voltage ib4[d0] = 1 6.5 7.2 7.7 v ib4[d0] = 0 5.2 5.5 5.9 v ? v p(low)(mute) low supply voltage mute hysteresis ib4[d0] = 1 0.1 0.5 0.8 v ib4[d0] = 0 0.1 0.3 0.7 v v p(ovp)pwarn pre-warning overvoltage protection supply voltage rising supply voltage 15.2 16 16.9 v falling supply voltage 14.4 15.2 16.2 v hysteresis - 0.8 - v v th(ovp) overvoltage protection threshold voltage rising supply voltage 18 20 22 v v por power-on reset voltage falling supply voltage - 3.1 4.5 v v o(offset) output offset voltage amplifier on ? 75 0 +75 mv amplifier mute ? 25 0 +25 mv line driver mode ? 45 0 +45 mv mode select and second clip detection: pin stb v stb voltage on pin stb off mode selected i 2 c-bus mode - - 0.8 v legacy mode (i 2 c-bus mode off) --0.8v mute selected legacy mode (i 2 c-bus mode off) 2.5- 4.5v operating mode selected i 2 c-bus mode 2.5 - v p v legacy mode (i 2 c-bus mode off) 5.9 - v p v low voltage on pin stb when pulled low during clipping [1] i stb = 150 ? a5.65.96.5v i stb = 500 ? a6.1-7.4v i stb current on pin stb 0 v < v stb < 8.5 v; clip detection not active [1] -530 ? a table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 34 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier start-up/shut-dow n/mute timing t wake wake-up time time afte r wake-up via pin stb before first i 2 c-bus transmission is recognized; see figure 4 - 300 500 ? s i lo(svr) output leakage current on pin svr --5 ? a t d(mute_off) mute off delay time time from amplifier start to 10 % of output signal; i lo = 0 ? a [2] i 2 c-bus mode; with i lo =5 ? a ? +15 ms; no dc-load (ib1[d1] = 0); see figure 4 - 430 650 ms legacy mode; with i lo =5 ? a ? +20 ms; v stb =7v; r adsel =0 ? ; see figure 5 - 430 650 ms t amp_on amplifier on time time from amplifier start to amplifier on; 90 % of output signal; i lo = 0 ? a [2] i 2 c-bus mode; with i lo =5 ? a ? +30 ms; no dc-load (ib1[d1] = 0); see figure 4 - 550 800 ms legacy mode; with i lo =5 ? a ? +20 ms; v stb =7v; r adsel =0 ? ; see figure 5 - 550 800 ms t off amplifier switch-off time time to dc output voltage < 0.1 v; i lo =0 ? a [2] i 2 c-bus mode; with i lo =5 ? a ? +0 ms; see figure 4 250 500 750 ms via pin stb; (ib4[d6] = 0); with i lo =5 ? a ? +0 ms; see figure 5 250 500 750 ms t d(mute-on) delay time from mute to on from 10 % to 90 % of output signal; v i =50mv; i 2 c-bus mode (ib2[d1] = 1 to 0) or legacy mode (v stb = 2 v to 7 v); see figure 5 51540ms t d(soft_mute) soft mute delay time from 90 % to 10 % of output signal; v i =50mv; i 2 c-bus mode (ib2[d1] = 0 to 1) or legacy mode (v stb = 7 v to 2 v); see figure 5 51540ms t d(fast_mute) fast mute delay time from 90 % to 10 % of output signal; v i =50mv; i 2 c-bus mode (ib2[d0] = 0 to 1, or v stb from > 5.9 v to < 0.8 v in 1 ? s; see figure 5 -0.41ms table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 35 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier t (start-vo(off)) engine start to output off time v p from 14.4 v to 5 v in 1.5 ms; v o <0.5v; see figure 6 -0.11ms t (start-svroff) engine start to svr off time v p from 14.4 v to 5 v in 1.5 ms; v svr < 0.7 v; see figure 6 -4075ms i 2 c-bus interface [3] v il low-level input voltage pins scl and sda - - 1.5 v v ih high-level input voltage pins scl and sda 2.3 5.5 v v ol low-level output voltage pin sda; i l = 5 ma - - 0.4 v f scl scl clock frequency - 400 - khz v adsel voltage on pin adsel i 2 c-bus address a[6:0] = 1101 101 r adsel = 0 ? 4511v rseries adsel = 100 k ? --v p v i i(adsel) input current on pin adsel v stb =5v; v adsel =5v - 2 10 ? a r adsel resistance on pin adsel i 2 c-bus address a[6:0] = 1101 110 99 100 101 k ? i 2 c-bus address a[6:0] = 1101 111 29.7 30 30.3 k ? i 2 c-bus address a[6:0] = 1101 010 9.9 10 10.1 k ? legacy mode - - 0.47 k ? v p(latch) latch supply voltage will not react to address selection changes 6v start-up diagnostics t sudiag start-up diagnostic time from start-up diagnostic command via i 2 c-bus until completion of start-up diagnostic; v o + < 0.1 v; v o ? < 0.1 v (no load) ib1[d1] = 1; see figure 12 50 130 250 ms t d(sudiag-on) start-up diagnostic to on delay time at 90 % of output signal; ib1[d0:d1] = 11; see figure 12 -680-ms v offset offset voltage startup diagnostic offset voltage under no load condition 1.32 2.5v r ldet(sudiag) start-up diagnostic load detection resistance v p = 14.4 v shorted load: high gain; ib3[d6:d5] = 00 - - 0.5 ? low gain; ib3[d6:d5] = 11 - - 1.5 ? normal load: high gain (ib3[d6:d5] = 00) 1.5 - 20 ? low gain (ib3[d6:d5] = 11) 3.2 - 20 ? line driver load 80 - 200 ? open load 400 - - ? table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 36 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier diagnostic v ol(diag) low-level output voltage on pin diag fault condition; i diag = 1 ma - - 0.3 v v o(offset_det) output voltage at offset detection ? 1.0 ? 1.3 ? 2.0 v thd clip total harmonic distortion clip detection level ib2[d7:d6] = 10; v p > 10 v - 10 - % ib2[d7:d6] = 01; v p > 10 v - 5 - % ib2[d7:d6] = 00; v p > 10 v - 2 - % t j(av)(pwarn) pre-warning average junction temperature ib3[d4] = 0 or legacy mode 150 160 170 ?c ib3[d4] = 1 125 135 145 ?c t j(av)(g( ? 0.5db) average junction temperature for 0.5 db gain reduction v i = 0.05 v - 175 - ?c ? g (th_fold) gain reduction of thermal foldback all channels will switch off - 20 - db i o output current i 2 c-bus mode; ib4[d4] = 1; peak current ib4[d1] = 1 500 - - ma ib4[d1] = 0 275 - - ma i 2 c-bus mode; ib4[d4] = 0; peak current ib4[d1] = 1 - - 250 ma ib4[d1] = 0 - - 110 ma amplifier p o output power r l =4 ? ; v p = 14.4 v; thd = 0.5 % 18 20 - w r l =4 ? ; v p = 14.4 v; thd = 10 % 23 25 - w r l =2 ? ; v p = 14.4 v; thd = 0.5 % 29 32 - w r l =2 ? ; v p = 14.4 v; thd = 10 % 40 44 - w p o(max) maximum output power r l =4 ? ; v p = 14.4 v; v i = 2 v rms square wave 37 40 - w r l =4 ? ; v p = 15.2 v; v i = 2 v rms square wave 41 45 - w r l =2 ? ; v p = 14.4 v; v i = 2 v rms square wave 58 64 - w table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 37 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier thd total harmonic distortion p o = 1 w to 12 w; f i = 1 khz; r l =4 ? - 0.01 0.1 % p o = 1 w to 12 w; f i =10khz - 0.2 0.4 % line driver mode; v o =1vrms and 4 v rms - 0.02 0.05 % low gain mode; p o =1w to 12w; f i = 1 khz; r l =4 ? - 0.01 0.1 % ? cs channel separation r s =1k ? ; r acgnd =250 ? [4] f i =1khz 6580- db f i =10khz 55 65 - db svrr supply voltage ripple rejection 100 hz to 10 khz; r s =1k ? ; r acgnd =250 ? ; tested at v p = 10.5 v [4] 55 70 - db cmrr common mode rejection ratio amplifier mode; v cm = 0.3 v (p-p); f i = 1 khz to 3 khz; r s = 1 k ? ; r acgnd =250 ? [4] common mode input to differential output (v o(dif) / v i(cm) + 26 db) 55 65 - db common mode input to common mode output (v o(cm) /v i(cm) + 26 db) 50 58 - db ? v o output voltage variation plop during switch-on and switch-off [5] from off to mute and mute to off - - 7.5 mv from mute to on and on to mute (soft mute) --7.5mv from off to on and on to off (start-up diagnostic enabled) --7.5mv v n(o) output noise voltage filter 20 hz to 22 khz (6th order); r s =1k ? mute mode - 15 23 ? v line driver mode - 25 33 ? v line driver mode; r s =50 ? -2533 ? v amplifier mode - 43 65 ? v amplifier mode; r s =50 ? -4060 ? v g v(amp) voltage gain amplifier mode single-ended in to differential out 25.5 26 26.5 db g v(ld) voltage gain line driver mode single-ended in to differential out 15.5 16 16.5 db z i input impedance t amb = ? 40 ? c to +105 ? c 386299k ? t amb = 0 ? c to 105 ? c 556299k ? ? mute mute attenuation v o /v o(mute) ; v i =50mv 8092- db table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 38 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier [1] v stb depends on the current into pin stb: minimum = (1429 ? ? i stb ) + 5.4 v, maximum = (3143 ?? i stb )+5.6v. [2] the times are specified without leakage current. for a leakage current of 5 ? a on pin svr, the delta time is specified. if the capacitor value on pin svr changes ? 30 %, the specified time will also change ? 30 %. the specified times include an esr of 15 ? for the capacitor on pin svr. [3] standard i 2 c-bus specification: maximum low-level = 0.3v dd , minimum high-level = 0.7v dd . to comply with 5 v and 3.3 v logic the maximum low-level is defined by v dd = 5 v and the minimum high-level by v dd =3.3v. [4] for optimum channel separation ( ? cs ), supply voltage ripple rejection (svrr) and co mmon mode rejection ratio (cmrr), a resistor ? must be in series with the acgnd capacitor. [5] the plop-noise during amplifier switch-on and swit ch-off is measured using an itu-r 2 k filter; see figure 20 . v o(mute)(rms) rms mute output voltage v i = 1 v rms; filter 20 hz to 22 khz -1629 ? v b p power bandwidth ? 1 db - 20 to 20000 -hz c l(crit) critical load capacitance no oscillation; open load and 2 ? load; all outputs to gnd or across the load 33 - - nf table 20. characteristics ?continued refer to test circuit (see figure 29 ) at t amb =25 ? c; v p = 14.4 v; unless otherwise specified. tested at t amb =25 ? c; guaranteed for t j = ? 40 ? c to +150 ? c; functionality is guaranteed for v p < 10 v unless otherwise specified. symbol parameter conditions min typ max unit r acgnd r s 4 ----- - = fig 19. location of itu-r 2k filter differential to single ? ended 5 th order 20 khz butterworth low-pass filter itu-r 2k filter rectifier peak detector output buffer + 40 db gain output input 001aam706
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 39 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 12. performance diagrams (1) 20 hz. (2) a-weighting. (3) itu-r average response meter. (4) 20 khz bandwidth limit. fig 20. tdf8541; plop noise test using itu-r 2k filter 001aam707 f (hz) 10 10 5 10 4 10 2 10 3 ?70 ?10 ?30 ?50 10 output (db) (1) (4) (2) (3) maximum 6 db at 6 khz 0 db at 2 khz (1) p o =1w. (2) p o = 10 w. fig 21. total harmonic distortion as a function of input frequency; 4 ? load 001aan725 10 10 5 10 4 10 2 10 3 10 2 10 1 1 10 10 3 1 2
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 40 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier (1) p o =1w. (2) p o = 10 w. fig 22. total harmonic distortion as a function of input frequency; 2 ? load (1) f i = 1 khz, channel 1. (2) f i = 100 hz, channel 1. (3) f i = 6 khz, channel 1. (4) f i = 10 khz, channel 1. fig 23. total harmonic distortion as a function of output power; 4 ? load 001aan727 f i (hz) 10 10 5 10 4 10 2 10 3 10 -2 10 -1 1 10 thd+n (%) 10 -3 (2) (1) 001aan450 p o (w) 10 ?1 10 2 10 1 10 ?2 10 ?1 1 10 thd + n (%) 10 ?3 (4) (3) (2) (1)
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 41 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier (1) f i = 1 khz, channel 1. (2) f i = 100 hz, channel 1. (3) f i = 6 khz, channel 1. (4) f i = 10 khz, channel 1. fig 24. total harmonic distortion as a function of output power; 2 ? load f i = 1 khz. (1) thd = 10 %; 2 ? load. (2) thd = 0.5 %; 2 ? load. (3) thd = 10 %; 4 ? load. (4) thd = 0.5 %; 4 ? load. fig 25. output power as a function of supply voltage; 2 ? and 4 ? loads 001aan451 p o (w) 10 ?2 10 2 10 10 ?1 1 1 10 ?1 10 thd + n (%) 10 ?2 (4) (3) (2) (1) 0 60 p o (w) 001aan452 v p (v) 616 11 10 20 30 40 50 (1) (2) (3) (4)
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 42 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 26. channel separation as a function of input frequency; 4 ? load fig 27. channel separation as a function of input frequency; 2 ? load 001aan092 -60 -40 -80 -20 0 cs (db) -100 f i (hz) 10 10 5 10 4 10 2 10 3 001aan093 ? ? ? ? ?
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 43 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 28. supply voltage ripp le rejection as a function of input frequency 001aan044 f i (hz) 10 10 5 10 4 10 2 10 3 ?60 ?40 ?80 ?20 0 svrr (db) ?100
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 44 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 13. application information (1) the svr and acgnd capacitors and the r adsel resistor must be connected to pin sgnd before they are connected to pin pgndn; the acgnd capacitor value must be close to 4 ? the input capacitor value. 4 ? 470 nf capacitors can be used as an alternative to the 2.2 ? f capacitor shown. (2) for emc reasons, a 10 nf capacitor can be connected between each amplifier output and ground. fig 29. test and application diagram 26 db/ 16 db 26 db/ 16 db 26 db/ 16 db 26 db/ 16 db 001aan095 standby/ fast mute i 2 c-bus sda scl v p1 v p2 adsel select diagnostic/ clip detect engine start protection stb in3 in1 in4 in2 diag +5 v out3+ out3- out1+ out1- out4+ out4- out2+ out2- mute mute mute mute tab acgnd sgnd svr 2.2 f (1) 10 f (1) pgnd1 11 (24) 13 (26) 15 (28) 12 (25) 16 (29) 2 (11) 1 (10) 26 (8) 23 (7) 21 (3) 7 (16) 10 k 10 k r adsel (1) 5 (9) 18 (2) 20 (1) 10 (17) 8 (18) 6 (13) 4 (15) 27 (36) 22 (6) 24 (4) 14 (27) 17 (30) 9 (23) 3 (14) 19 (32) 25 (5) pgnd2 pgnd3 pgnd4 v p tdf8541 r s 470 nf r s 470 nf r s 470 nf r s 470 nf protection/ diagnostic protection/ diagnostic protection/ diagnostic protection/ diagnostic (2) (2) (2) (2)
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 45 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 13.1 application pcb layout remark: please use the tdf8541j board to ev aluate the TDF8541SD. the TDF8541SD does not fit on this board but is equal in behavior and performance. fig 30. tdf8541j pcb top view fig 31. tdf8541j pcb bottom view 001aan737 001aan738
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 46 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 32. tdf8541th pcb top view fig 33. tdf8541th pcb bottom view 001aao326 001aao327
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 47 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 13.2 beep input circuit to amplify the beep signal from the micr ocontroller to all four amplifiers with gain set to 0 db. 13.3 clip detection on pin stb 14. test information 14.1 quality information this product has been qualified in accordance with the automotive electronics council (aec) standard q100 - failure mechanism based stress test qualification for integrated circuits , and is suitable for use in automotive applications. fig 34. beep input circuit tdf8541 2.2 f acgnd 1.7 k from microcontroller 100 0.22 f 47 pf 001aan096 fig 35. circuit for testing clip detection on pin stb 4.7 k 18 k 10 k switch 10 k 8.5 v 3.3 v tdf8541 micro- controller stb 001aan739
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 48 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 15. package outline fig 36. package outline sot827-1 (dbs27p) unit a d (1) e (1) references outline version european projection issue date iec jedec jeita mm 19 a 2 4.65 4.35 b p 0.60 0.45 dimensions (mm are the original dimensions) note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. sot827-1 - - - - - - - - - 0 10 20 mm scale l e a c a 2 m l 3 l 4 l 2 q w m b p d z e 1 e 2 e 1 27 dbs27p: plastic dil-bent-sil (special bent) power package; 27 leads (lead length 6.8 mm) sot827-1 v m d x h e h non-concave view b: mounting base side b d c z (1) de e 1 e 2 l 3 d h e h lm 0.5 0.3 29.2 28.8 25.8 25.4 12 2 15.9 15.5 14 1.15 0.85 l 2 3.9 3.1 l 4 22.9 22.1 8 1.8 1.2 2.1 1.8 3.4 3.1 4 6.8 q j 0.25 w 0.6 v 0.03 x j 03-07-29
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 49 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 37. package outline sot878-1 (rdbs27p) references outline version european projection issue date iec jedec jeita sot878-1 sot878-1 05-01-11 05-01-26 note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included dimensions (mm are the original dimensions) b p d d d h a 2 l c l 1 q z e h e j x e 2 a e 1 e v m w m 0 10 20 mm scale unit a mm 13.5 4.65 4.35 0.60 0.45 25.8 25.4 12 3.4 3.1 3.75 3.15 3.75 3.15 2.1 1.8 1.8 1.2 a 2 b p d 0.5 0.3 c 29.2 28.8 d (1) ee (1) 2.5412 e h e 1 e 2 15.9 15.5 d h j l 8 l 1 v 0.6 w 0.25 x 0.03 q z (1) rdbs27p: plastic rectangular-dil-bent-sil (reverse bent) power package; 27 leads (row spacing 2.54 mm) view b: mounting base side non-concave b 27 1
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 50 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier fig 38. package outline sot851-1 (hsop36) references outline version european projection issue date iec jedec jeita sot851-1 sot851-1 04-03-09 04-05-25 hsop36: plastic, heatsink small outline package; 36 leads; low stand-off height b p z 118 36 19 d 1 d 2 e 1 e a h e d e 2 y x e w pin 1 index va x l p detail x (a 3 ) a 2 a 4 c a q 0 5 10 mm scale unit a 4 (1) mm + 0.08 ? 0.04 3.5 0.35 dimensions (mm are the original dimensions) notes 1. limits per individual lead. 2. plastic or metal protrusions of 0.25 mm maximum per side are not included. a max. a 2 3.4 3.3 d 2 1.1 0.9 h e 14.5 13.9 l p 1.1 0.8 q 1.7 1.5 2.55 2.20 v 0.25 w 0.12 yz 8 0 0.07 x 0.03 d 1 13.0 12.6 e 1 6.2 5.8 e 2 2.9 2.5 b p c 0.32 0.23 e 0.65 d (2) 16.0 15.8 e (2) 11.1 10.9 0.38 0.25 a 3
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 51 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 16. abbreviations 17. revision history table 21. abbreviations acronym description bcdmos bipolar complementary double-diffused metal-oxide semiconductor btl bridge tied load cmos complementary metal-oxide semiconductor dmos diffusion metal oxide semiconductor dsp digital signal processor emc electromagnetic compatibility esr equivalent series resistance nmos negative metal oxide semiconductor pmos positive metal oxide semiconductor por power-on reset soar safe operating area soi silicon on insulator table 22. revision history document id release date data sheet status change notice supersedes tdf8541 v.1 20110829 product data sheet - -
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 52 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier 18. legal information 18.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 18.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 18.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. export control ? this document as well as the item(s) described herein may be subject to export control regulations. export might require a prior authorization from national authorities. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
tdf8541 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2011. all rights reserved. product data sheet rev. 1 ? 29 august 2011 53 of 54 nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier quick reference data ? the quick reference data is an extract of the product data given in the limiting values and characteristics sections of this document, and as such is not comple te, exhaustive or legally binding. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. 18.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. i 2 c-bus ? logo is a trademark of nxp b.v. 19. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors tdf8541 i 2 c-bus controlled 4 ? 45 w power amplifier ? nxp b.v. 2011. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 29 august 2011 document identifier: tdf8541 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 20. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 quick reference data . . . . . . . . . . . . . . . . . . . . . 2 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6 7 functional description . . . . . . . . . . . . . . . . . . . 7 7.1 start-up and shut down sequence . . . . . . . . . . 7 7.2 engine start and low voltage operation. . . . . . . 9 7.3 power-on reset and supply voltage spikes . . . 10 7.4 protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.4.1 output protec tion and short-circuit protection. 10 7.4.2 loss-of-ground/loss of v p . . . . . . . . . . . . . . . . 11 7.4.3 speaker fault detection . . . . . . . . . . . . . . . . . . 12 7.4.4 overvoltage warning and load dump protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.4.5 thermal pre-warning and thermal protection . 13 7.5 diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.5.1 start-up diagnostics with dc load detection . . 14 7.5.2 dc offset detection . . . . . . . . . . . . . . . . . . . . . 17 7.5.3 ac load detection . . . . . . . . . . . . . . . . . . . . . . 18 7.5.4 distortion clip detection . . . . . . . . . . . . . . . . . 20 7.6 line driver mode and low gain mode . . . . . . . 20 7.7 i 2 c-bus, legacy mode and address select pin 21 7.7.1 address select (pin adsel) . . . . . . . . . . . . . . 21 7.7.2 legacy mode (r adsel < 470 w). . . . . . . . . . . 21 7.7.3 i 2 c-bus mode . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.7.4 i 2 c-bus diagnostic bits read-out/cleared after read . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.8 amplifier combined with a dc-to-dc converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 i 2 c-bus specification . . . . . . . . . . . . . . . . . . . . 22 8.1 i 2 c-bus instruction bytes. . . . . . . . . . . . . . . . . 23 8.2 i 2 c-bus data bytes . . . . . . . . . . . . . . . . . . . . . 27 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 31 10 thermal characteristics . . . . . . . . . . . . . . . . . 32 11 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 32 12 performance diagrams . . . . . . . . . . . . . . . . . . 39 13 application information. . . . . . . . . . . . . . . . . . 44 13.1 application pcb layout . . . . . . . . . . . . . . . . . . 45 13.2 beep input . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 13.3 clip detection on pin stb . . . . . . . . . . . . . . . . 47 14 test information . . . . . . . . . . . . . . . . . . . . . . . . 47 14.1 quality information . . . . . . . . . . . . . . . . . . . . . 47 15 package outline. . . . . . . . . . . . . . . . . . . . . . . . 48 16 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 51 17 revision history . . . . . . . . . . . . . . . . . . . . . . . 51 18 legal information . . . . . . . . . . . . . . . . . . . . . . 52 18.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 52 18.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 18.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 52 18.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 53 19 contact information . . . . . . . . . . . . . . . . . . . . 53 20 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

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