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1/14 STA5100 september 2002 this is preliminary information on a new product now in development. details are subject to change without notice. n monochip bridge mono amplifier for bash ? architecture n 110w output power @ r l = 4 w, thd = 0.5% n 140w output power @ r l = 4 w, thd = 10% n high dynamic preamplifier input stages n external programmable feedback type compressors n ac coupled input to class ab bridge output amplifier n precision rectifiers to drive the digital converter n on-off sequence/ timer with mute and standby n proportional over power output current to limit the digital converter n absolute power bridge output transistor power protection n absolute output current limit n integrated thermal protection n power supply over voltage protection n flexiwatt power package with 27 pin n bash? licence required description the STA5100 is a fully integrated power module de- signed to implement a bash? amplifier when used in conjunction with stabp01 digital processor. flexiwatt27 product preview 140w mono power amplifier block diagram absolute value block output bridge peak detector over voltage protection soa detector turn- on/off sequence thermal protection compressor d g +2 +2 + - v/l s1 ict output bridge cd-n cd+n stby/mute prot. cd+ cd-p outp outp cd+p in_pre att_rel trk_out thresh pwr_inp trk out_ pre -vs gnd +vs d01au1280 outn outn -1 -1
STA5100 2/14 description (continued) notice that normally only one digital converter is needed to supply a stereo or multi-channel amplifier system, therefore most of the functions implemented in the circuit have summing outputs the signal circuits are biased by fixed negative and positive voltages referred to ground. instead the final stag- es of the output amplifiers are supplied by two external voltages that are following the audio signal . in this way the headroom for the output transistors is kept at minimum level to obtain a high efficiency power amplifier. the compressor circuits, one for each channel, performs a particular transfer behavior to avoid the dynamic restriction that an adaptive system like this requires. to have a high flexibility the attack / release time and the threshold levels are externally programmable. the tracking signal for the external digital converter is generated from the absolute value block that rectifies the audio signal present at the compressor output. the outputs of these blocks are decoupled by a diode to permit an easy sum of this signal for the multichannel application. the output power bridges have a dedicated input pin to perform an ac decoupling to cancel the compressor output dc offset. the gain of the stage is equal to 4 (+12db). a sophisticated circuit performs the output transistor pow- er detector that , with the digital converter, reduces the power supply voltage . moreover, a maximum current output limiting and the over temperature sensor have been added to protect the circuit itself. the external volt- age applied to the stby/mute pin forces the two amplifiers in the proper condition to guarantee a silent turn- on and turn-off. absolute maximum ratings notes: 1. v cd- must not be more negative than -vs and v cd+ must not be more positive than +v s thermal data symbol parameter value unit +v s positive supply voltage referred to pin 13 (gnd) 30 v -v s negative supply voltage referred to pin 13 (gnd) -24 v v cd+ positive supply voltage tracking rail referred to pin 13 (gnd) 22 v v cd+ positive supply voltage operated to vs+ (1) 0.3 v v cd- negative supply voltage referred to -vs (1) -0.3 v v cd- negative supply voltage tracking rail referred to pin 13 (gnd) -22 v v att_rel pin 3 negative & positive maximum voltage reffered to gnd (pin 13) -0.5 to +20 v v pwr_imp vtrk pin 7, 10 negative & positive maximum voltage referred to gnc (pin 13) -20 to +20 v v in_pre pin 8 negative & positive maximum voltage referred to gnd (pin 13) -0.5 to +0.5 v v threshold pin 17 negative & positive maximum voltage referred to gnd (pin 13) -7 to +0.5 v i stb-max pin 11 maximum input current (internal voltage clamp at 5v) 500 m a v stbymute pin 11 negative maximum voltage referred to gnd (pin 13) -0.5 v symbol parameter value unit t j max junction temperature 150 c r th j_case thermal resistance junction to case .............................. .. max 1 c/w
3/14 STA5100 operating range pin connection symbol parameter value unit +v s positive supply voltage +20 to +30 v -v s negative supply voltage -10 to -22 v d v s+ delta positive supply voltage 5v (vs+ - vcd+) 10v v v cd+ positive supply voltage tracking rail +3 to +17 v v cd- negative supply voltage tracking rail -3 to -17 v i in_max current at pin in_pre related to compressor behaviour -1 to +1 ma peak v trheshold voltage at pin threshold -5 to 0 v t amb ambient temperature range 0 to 70 c i sb_max pin 11 maximum input current (internal voltage clmp at 5v) 200 m a d01au1281 cd-p -v s att-rel outp outp cd+p pwr_inp in_pre out_pre trk stby/mute protection gnd +v s cd+ trk_out threshold n.c. n.c. n.c. n.c. cd+n outn outn n.c. cd-n -vs 1 27
STA5100 4/14 pin function n name description 1 -vs negative bias supply 2 cd-p channel p time varying tracking rail negative power supply 3 att_rel attack release rate 4 outp channel p 5 outp channel p 6 cd+p channel p positive power supply 7 pwr_inp input to power stage 8 in_pre pre-amp input (virtual ground) 9 out_pre output channel 10 trk absolute value block input 11 stby/mute standby/mute input voltage control 12 protection protection signal for stabp01 digital processor 13 gnd analog ground 14 +vs positive bias supply 15 cd+ time varying tracking rail positive power supply 16 trk_out reference output for stabp01 digital processor 17 threshold compressor threshold input 18 n.c. 19 n.c. 20 n.c. 21 n.c. 22 cd+n channel n positive power supply 23 outn channel n 24 outn channel n 25 n.c. 26 cd-n channel n time varying tracking rail negative power supply 27 -vs negative bias supply
5/14 STA5100 electrical characteristcs (test condition: vs+ = 26v, vs- = -22v, v cd+ = 17v, v cd- = -17v, r l = 4 w , external components at the nominal value f = 1khz, tamb = 25c unless otherwise specified symbol parameter test condition min. typ. max. unit preamplifier and compressor v out clamp maximum voltage at out_pre pin 10 11 12 vpeak i in audio input current 0.8 ma v control voltage at attack_release pin attenuation = 0db attenuation = 6db attenuation = 26db 0.35 6 0 0.5 9 0.65 12 v v v vc omp_ th input voltage range for the compression -5 -1 v z th input impedance of threshold pin 100 k w voffset output offset at out_pre pin with: v crt = 0v; attenuation = 0db v crt = 0.5v; attenuation = 6db v crt = 9v; attenuation = 26db -10 -250 -450 10 250 450 mv mv mv thd distortion at out_pre: v crt = 0v; attenuation = 0db v crt = 0.5v; attenuation = 6db v crt = 9v; attenuation = 26db 0.01 5 5 % % % en noise at out_pre pin : v crt = 0v; attenuation = 0db v crt = 0.5v; attenuation = 6db v crt = 9v; attenuation = 26db 10 (2) 50 60 m v m v m v i ct attack time current at pin attack_release 1.5 ma 2. this value is due to the thermal noise of the external resistors r r and r i . tracking parameters g trk tracking reference voltage gain 13 14 15 v v trk_out tracking ref. output voltage 0 20 v i trk_out current capability 5 6 7 ma z trk_in input impedance (t rk )1m w output bridge g out half output bridge gain 5.5 6 6.5 db g ch output bridge differential gain 11 12 13 db d g ch output bridges gain mismatch -1 1 db p out continuous output power thd = 0.5% thd = 10% 100 125 110 140 w w thd total harmonic distortion of the output bridge po = 5w 0.01 % f = 20hz to 20khz; po = 50w 0.1 % v off output bridge d.c. offset 50 mv en noise at output bridge pins f = 20hz to 20khz; rg = 50 w 12 m v z br_in input impedance 100 140 180 k w
STA5100 6/14 r dson output power rdson i o = 1a 100 200 m w olg open loop voltage gain 100 db gb unity gain bandwidth 1.4 mhz sr slew rate 7v/ m s protection v stby stby voltage range 0 0.8 v v mute mute voltage range 1.6 3 v v play play voltage range 4 5 v t h1 first over temperature threshold 130 c t h2 second over temperature threshold 150 c unbal. ground upper unbalancing ground threshold referred to (cd + - cd - )/2 5v unbal. ground lower unbalancing ground threshold referred to (cd + - cd - )/2 -5 v uv th under voltage threshold |vs+| + |vs-| 20 v p d_reg. power dissipation threshold for system regulation i prot = 50 m a; @ vds = 10v 50 62 w p d_max switch off power dissipation threshold @ vds = 10v 96 w i prot protection current slope for pd > pd reg 400 m a/w i lct limiting current threshold 11 12 13 a i+vs positive supply current stby (vstby/mute pin = 0v) mute (vstby/mute pin = 2.5v) play (vstby/mute pin = 5v no signal) 4 30 30 ma ma ma i-vs negative supply current stby (vstby/mute pin = 0v) mute (vstby/mute pin = 2.5v) play (vstby/mute pin = 5v no signal) 4 30 30 ma ma ma icd+ positive traking rail supply current stby (vstby/mute pin = 0v) mute (vstby/mute pin = 2.5v) play (vstby/mute pin = 5v no signal) 100 110 110 m a ma ma icd- negative traking rail supply current stby (vstby/mute pin = 0v) mute (vstby/mute pin = 2.5v) play (vstby/mute pin = 5v no signal) 100 110 110 m a ma ma symbol parameter test condition min. typ. max. unit electrical characteristcs (continued)
7/14 STA5100 functional description the circuit contains all the blocks to build a mono amplifier. it is based on the output bridge power amplifier, and its protection circuit. moreover, the compression function and a signal rectifier are added to complete the circuit. the operation modes are driven by the turn-on/off sequence block. in fact the ic can be set in three states by the stby/mute pin: standby ( v pin < 0.8v), mute (1.6v < v pin < 3v), and play (v pin > 4v). in the standby mode all the circuits involved in the signal path are in off condition, instead in mute mode the circuits are biased but the speakers outputs are forced to ground potential. these voltages can be get by the external rc network connected to stby/mute pin. the same block is used to force quickly the i.c. in standby mode or in mute mode when the i.c. dangerous condition has been detected. the rc network in these cases is used to delay the normal operation restore. the protection of the i.c. are implemented by the over temperature, unbalance ground, output short circuit, under voltage, and output transistor power sensing as shown in the following table: table 1. protection implementation see the power protection paragraph for the details compression an other important function implemented, to avoid high power dissipation and clipping distortion, is the com- pression of the signal input. in fact the preamplifier stage performs a voltage gain equal to 5, fixed by ri and rr external resistor, but in case of high input signal or low power supply voltage, its gain could be reduced of 26db. this function is obtained with a feedback type compressor that , in practice, reduces the impedance of the ex- ternal feedback network. the behavior of compression it's internally fixed but depends from the audio input volt- age signal level, and from the threshold voltage applied to the threshold pin. the attack and release time are programmable by the external rc network connected to the att_rel pins. the constraints of the circuit in the typical application are the following: vthreshold range = -5 to 0 vin peak max = 8v vout peak max = 10v fault type condition protection strategy action time release time chip over temperature tj > 130 c mute fast slow related to turn_on sequence chip over temperature tj > 150 c standby fast slow, related to turn_on sequence unbalancing ground |vgnd| > ((cd+) - (cd-))/2 + 5v standby fast slow, related to turn_on sequence short circuit iout > 12a standby fast slow, related to turn_on sequence under voltage |vs+| + |vs-|< 20v standby fast slow, related to turn_on sequence extra power dissipation at output transistor pd tr. > 50w reducing digital converter output voltage. related to the digital converter related to the digital converter maximum power dissipation at output transistor pd tr. > 96w standby fast slow, related to turn_on sequence
STA5100 8/14 gain without compression (g) = 5 max attenuation ratio = 26 db the following graph gives the representation of the compressor activation status related to the vthreshold and the input voltage. the delimitation line between the two fields, compression or not, is expressed by the formula : where g is the preamplifier gain without compression. in the compression region the gain of the preamplifier will be reduced (g = 2vthreshold/vin) to maintain at steady state the output voltage equal 2*|vthreshold| . instead in the other region the compressor will be off (g = 5). the delimitation line between the two fields can be related to the output voltage of the preamplifier: in this case the formula is : figure 1. compressor activation field the relative attenuation introduced by the variable gain cell is the following : the total gain of the stage will be: gdb = 20log5 + attenuation the maximum input swing is related to the value of input resistor, to guarantee that the input current remain under iin_max value (1 ma). v in 2vthreshold g ------------------------------------------ - = v out 2vthreshold = 1 2 4 6 8 2345 g = 5 |vthreshold| v in peak compression g < 5 d01au1264 attenuation 20 2 5 -- - log v th v in_peak --------------------- - = r i v in_peak i in_max --------------------- - >
9/14 STA5100 figure 2. compressor attenuation vs. input amplitude absolute value block the absolute value block rectifies the signal after the compression to extract the control voltage for the external digital converter. the output voltage swing is internally limited, the gain is internally fixed to 14. the input impedance of the rectifier is very high , to allow the appropriate filtering of the audio signal before the rectification (between out_pre and trk pins). output bridge the output bridge amplifier makes the single-ended to differential conversion of the audio signal using two power amplifiers, one in non-inverting configuration with gain equal to 2 and the other in inverting configuration with unity gain. to guarantee the high input impedance at the input pins, pwr_inp1 and pwr_inp2, the second amplifier stages are driven by the output of the first stages respectively. power protection to protect the output transistors of the power bridge a power detector is implemented (fig 3). the current flowing in the power bridge and trough the series resistor rsense is measured reading the voltage drop between cd+1 and cd+. in the same time the voltage drop on the relevant power (vds) is internally mea- sured. these two voltages are converted in current and multiplied: the resulting current , ipd, is proportional to the instantaneous dissipated power on the relevant output transistor. the current ipd is compared with the ref- erence current ipda, if bigger (dissipated power > 50w) a current, iprot, is supplied to the protection pin. the aim of the current iprot is to reduce the reference voltage for the digital converter supplying the power stage of the chip, and than to reduce the dissipated power. the response time of the system must be less than 200 m sec to have an effective protection. as further protection, when ipd reaches an higher threshold (when the dissipated value is higher then 96w) the chip is shut down, forcing low the stby/mute pin, and the turn on sequence is restarted. 1 -24 -18 -12 -6 0 2345 6 7 8 |vinpk| attenuation(db) d01au1265 |vth=1| |vth=2.5| |vth=5|
STA5100 10/14 figure 3. power protection block diagram in fig. 4 there is the power protection strategy pictures. under the curve of the 50w power, the chip is in normal operation, over 96w the chip is forced in standby. this last status would be reached if the digital converter does not respond quikly enough reducing the stress to less than 96w. the fig.5 gives the protection current, iprot, behavior. the current sourced by the pin prot follows the formula: for p d < p d_av_th the i prot = 0 independently of the output voltage, the chip is also shut down in the folowing conditions: when the currentthrough the sensing resistor, r sense , reaches 12a (voltage drop (cd+) - (cd+1) = 700mv). when the average junction temperature of the chip reaches 150c. when the ground potential differ from more than 5v from the half of the power supply voltage, ((cd+)-(cd-))/2 when the sum of the supply voltage | vs+ | + |vs-| <20v the output bridge is muted when the average junction temperature reaches 130c. x v/i iload i_pd r sense multiplier ilim current comp current comp oc1 pdp1 iprot to turn-on/off sequence to turn-on/off sequence to prot pad d01au1282 ipdp ipda ipd ipd v/i opa outp outp opa cd- cd+ cd+p i prot p d p d_av_th ) C ( 510 4 C 1.25v ----------------------------------------------------------------- - o
11/14 STA5100 figure 4. power protection threshold figure 5. protection current behaviour 10 0 4 6 2 12 8 10 20 30 34 40 50 vds(v) ids(ma) d01au1303 ilim=12a pd_max=96w standby normal operation pd_reg=50w b u c k l i m i t a t i o n 20 10 20 40 60 80 100 120 pd(w) iprot(ma) d01au1304 iprot slope=0.4ma/w figure 6. test and application circuit input1 in_pre out_pre outp outp stby/ mute trk pwr_inp att_rel cd+p cd+ cd+ cd+n r1 r3 r10 r11 r16 c2 c8 c4 c12 c1 r14 r13 5v outp r15 mute stby c9 c3 r2 r5 r4 r6 +v s +v s -v s -v s -v s gnd r15 r14 c9 d1 c10 c11 c6 c7 cd-n trk-out prot thresh prot thresh trk-out cd-p cd- r13 r12 outn outn d01au1305 8 9107 4 5 24 11 23 3 6 15 22 14 13 27 1 26 2 16 12 17 outn STA5100
STA5100 12/14 external components note: vcontrol is the voltage at att_rel pin. name function value formula ri r1 input resistor 10k w (|g| = 5, rr = 50k w ) rr r2 feedback resistor 50k w (|g| = 5, ri = 10k w cac c1 ac decoupling capacitor 100nf (fp = 16hz, rac =100k w ) cct c2 capacitor for the attack time 2.2 m f (tattack = 13msec, vcontrol = 9v, ict = 1.5ma) r3 release constant time resistor 470k w ( t = 1 sec. , cct = 2.2 m f ) r4 resistor for tracking input voltage filter 10k w r5 resistor for tracking input voltage filter 56k w r6 resistor for tracking input voltage filter 10k w c3 capacitor for tracking input voltage filter 1nf c4 dc decoupling capacitor 1 m f r7 bias resistor for stby/mute function 10k w r8 stby/mute constant time resistor 30k w r9 mute resistor 30k w c5 capacitor for stby/mute resistor 2.2 m f r10 = r11 sensing resistor for soa detector 60m w 5% 4w r12 conversion resistor for threshold voltage 100k w c6 = c7 power supply filter capacitor 100nf r15 = r16 centering resistor 400 w , 1w c8 = c9 tracking rail power supply filter 680nf r13 protection 1k w r14 trk_out 40k w c10 = c11 power supply filter capacitor 470 m f , 63v c12 feedback capacitor 100pf d1 schottky diode sb360 r i rr g ------- = rr g rr = cac 1 2 p fp rac -------------------------------- - = cct attack ict vcontrol ------------------------ - = rct t cct --------- =
13/14 STA5100 outline and mechanical data h3 r4 g v g1 l2 h1 h f m1 l flex27me v3 o l3 l4 h2 r3 n v2 r r2 r2 c b l1 m r1 l5 r1 r1 e d a v v1 v1 dim. mm inch min. typ. max. min. typ. max. a 4.45 4.50 4.65 0.175 0.177 0.183 b 1.80 1.90 2.00 0.070 0.074 0.079 c 1.40 0.055 d 0.75 0.90 1.05 0.029 0.035 0.041 e 0.37 0.39 0.42 0.014 0.015 0.016 f (1) 0.57 0.022 g 0.80 1.00 1.20 0.031 0.040 0.047 g1 25.75 26.00 26.25 1.014 1.023 1.033 h (2) 28.90 29.23 29.30 1.139 1.150 1.153 h1 17.00 0.669 h2 12.80 0.503 h3 0.80 0.031 l (2) 22.07 22.47 22.87 0.869 0.884 0.904 l1 18.57 18.97 19.37 0.731 0.747 0.762 l2 (2) 15.50 15.70 15.90 0.610 0.618 0.626 l3 7.70 7.85 7.95 0.303 0.309 0.313 l4 5 0.197 l5 3.5 0.138 m 3.70 4.00 4.30 0.145 0.157 0.169 m1 3.60 4.00 4.40 0.142 0.157 0.173 n 2.20 0.086 o 2 0.079 r 1.70 0.067 r1 0.5 0.02 r2 0.3 0.12 r3 1.25 0.049 r4 0.50 0.019 v 5? (typ.) v1 3? (typ.) v2 20? (typ.) v3 45? (typ.) (1): dam-bar protusion not included (2): molding protusion included flexiwatt27
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics a 2002 stmicroelectronics - all rights reserved is the registered trademark and patented technology of indigo manufacturing inc. stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco - sin gapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com 14/14 STA5100

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