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1/15 tda7375a march 2005 1 features high output power capability: ? 2 x 43w max./4 ? ? 2 x 37w/4 ? eiaj ? 2 x 26w/4 ? @14.4v, 1khz, 10% ? 4 x 7w/4 ? @14.4v,1khz, 10% ? 4 x 12w/2 ? @14.4v, 1khz, 10% minimum external components count: ? no bootstrap capacitors ? no boucherot cells ? internally fixed gain (26db btl) st-by function (cmos compatible) no audible pop during st-by operations diagnostics facility for: ? clipping ? out to gnd short ?out to v s short ? soft short at turn-on ? thermal shutdown proximity 2 protections: ouput ac/dc short circuit ? to gnd ?to v s ? across the load soft short at turn-on overrating chip temperature with soft thermal limiter load dump voltage surge very inductive loads fortuitous open gnd reversed battery esd 2 x 37w dual/quad power amplifier for car radio figure 2. block diagram rev. 2 fi gure 1. p ac k age table 1. order codes part number package tda7375av multiwatt 15 (vertical) multiwatt15
tda7375a 2/15 3 description the tda7375a is a new technology cl ass ab car radio amplifier able to work either in dual bridge or quad single ended configuration. the exclusive fully complementary structure of the output stage and the internally fixed gain guarantee the highest possible power performances wit h extremely reduced component count. the on-board clip detector simplifies gain compressio n operation. the fault diagnostics makes it possible to detect mistakes during car radio set assembly and wiring in the car. table 2. absolute maximum ratings table 3. thermal data figure 3. pin connection (top view) symbol parameter value unit v op operating supply voltage 18 v v s dc supply voltage 28 v v peak peak supply voltage (for t = 50ms) 40 v i o output peak current (not repetitive t = 100 s) 4.5 a i o output peak current (repetitive f > 10hz) 3.5 a p tot power dissipation (t case = 85c) 36 w t stg , t j storage and junction temperature -40 to 150 c symbol parameter value unit r th j-case thermal resistance junction-case max 1.8 c/w
3/15 tda7375a table 4. electrical characteristcs (refer to the test circuit, v s = 14.4v; r l = 4 ? ; f = 1khz; t amb = 25c, unless otherwise specified) (*) see built-in s/c protection description (**) pin 10 pulled-up to 5v with 10k ? ; r l = 4 ? (***) saturated square wave output. symbol parameter test c ondition min. typ. max. unit v s supply voltage range 8 18 v i d total quiescent drain current r l = 150 ma v os output offset voltage 150 mv p o output power thd = 10%; r l = 4 ? bridge single ended single ended, r l = 2 ? 23 6.5 25 7 12 w w w p o max max. output power (***) v s = 14.4v, bridge 37 43 w p o eiaj eiaj output power (***) v s = 13.7v, bridge 33 37 w thd distortion r l = 4 ? single ended, p o = 0.1 to 4w bridge, p o = 0.1 to 10w 0.02 0.03 0.3 % % ct cross talk f = 1khz single ended 70 db f = 10khz single ended 60 db f = 1khz bridge 55 db f = 10khz bridge 60 db r in input impedance single ended 20 30 k ? bridge 10 15 k ? g v voltage gain single ended 19 20 21 db bridge 25 26 27 db g v voltage gain match 0.5 db e in input noise voltage r g = 0; ?a? weighted, s.e. non inverting channels inverting channels 2 5 v v bridge rg = 0; 22hz to 22khz 3.5 v svr supply voltage rejection r g = 0; f = 300hz 50 db a sb stand-by attenuation p o = 1w 80 90 db i sb st-by current consumption v st-by = 0 to 1.5v 100 a v sb st-by in threshold voltage 1.5 v v sb st-by out threshold voltage 3.5 v i pin7 st-by pin current play mode v pin7 = 5v 50 a max driving curr. under fault (*) 5 ma i cd off clipping detector output average current d = 1% (**) 90 a i cd on clipping detector output average current d = 5% (**) 160 a v sat pin10 voltage saturation on pin 10 sink current at pin 10 = 1ma 0.7 v
tda7375a 4/15 4 standard test and application circuit figure 4. quad stereo figure 5. double bridge figure 6. stereo/bridge c1 0.22 f 1 diagnostics 4 7 c10 2200 f d94au063a c7 10 f 10k r1 st-by in fl c2 0.22 f in fr 5 c4 0.22 f 12 in rl c3 0.22 f in rr 11 c8 47 f 6 13 c5 1000 f c6 100nf 3 v s c9 2200 f 2 15 c11 2200 f c12 2200 f 14 out fl out fr out rl out rr 89 10 note: the output decoupling capacitors (c9,c10,c11,c12) could be reduced to 1000 f if the 2 ? operation is not required. c1 0.47 f 1 diagnostics 4 7 d94au064a c5 10 f 10k r1 st-by in l c2 0.47 f 5 12 in r 11 c8 47 f 6 13 c3 1000 f c4 100nf 3 v s 2 15 14 out l 89 10 out r 0.22 f 1 diagnostics 4 7 d94au065a 10 f 10k st-by in l 0.47 f 5 in bridge 12 47 f 6 13 1000 f 100nf 3 v s 2 15 14 out l 89 10 out bridge 11 0.22 f in l out r 2200 f 2200 f
5/15 tda7375a figure 7. p.c. board and component layout of the fig.4 figure 8. p.c. board and component layout of the fig.5
tda7375a 6/15 figure 9. quiescent drain current vs. supply voltage (single ended and bridge). figure 10. quiescent output voltage vs. supply voltage (single ended and bridge). figure 11. output power vs. supply voltage figure 12. output power vs. supply voltage figure 13. outputpower vs. supply voltage figure 14. distortion vs. output power
7/15 tda7375a figure 15. distortion vs. output power figure 16. distortion vs. output power figure 17. cross-talk vs. frequency figure 18. supply voltage rejection vs. frequency figure 19. supply voltage rejection vs. frequency figure 20. stand-by attenuation vs. threshold voltage
tda7375a 8/15 figure 21. total power dissipation and efficiency vs. output power figure 22. total power dissipation and efficiency vs. output power 5 general structure 5.1 high application flexibility the availability of 4 indepe ndent channels makes it po ssible to accomplish seve ral kinds of applications ranging from 4 speakers stereo (f/r) to 2 speakers bridge solutions. in case of working in single ended conditions the pola rity of the speakers driven by the inverting amplifier must be reversed respect to those driven by non inve rting channels. this is to avoid phase inconveniences causing sound alterations especially duri ng the reproduction of low frequencies. 5.2 easy single ended to bridge transition the change from single ended to bridge configurations is made simply by means of a short circuit across the inputs, that is no need of further external components. 5.3 gain internally fixed to 20db in single ended, 26db in bridge advantages of this design choice are in terms of: componentsand space saving output noise, supply voltage rejection and distortion optimization. 5.4 silent turn on/off and muting/stand-by function the stand-by can be easily activated by means of a cmos level applied to pin 7 through a rc filter. under stand-by condition the device is turned off completely (supply current = 1 a typ.; output attenuation = 80db min.). every on/off operation is virtually po p free. furthemore, at turn-on the device stays in muting condition for a time determined by the value assigned to the svr capacitor. while in muting the device outputs becomes insensitive to any kinds of signal that may be present at the input terminals. in other words every transient coming from previous stages prod uces no unplesantacous- tic effect to the speakers. 5.5 output stage the fully complementary output stage was made possible by the development of a new component: the
9/15 tda7375a st exclusive power icv pnp. a novel design based upon the connecti on shown in fig. 23 has then allowed the full exploitation of its pos- sibilities. the clear adv antagesthis new appr oach has over classical output stages are as follows: 5.5.1 rail-to-rail output voltage swing with no need of bootstrap capacitors. the output swing is limited only by the v cesat of the output transistors, which is in the range of 0.3 ? (r sat ) each. classical solutions adopting composite pnp-npn for the upper output stage have higher saturation loss on the top side of the waveform. this unbalanced saturation causes a significant pow er reduction. the only way to recover power consists of the addition of expensive bootstrap capacitors. 5.5.2 absolute stability without any external compensation. referring to the circuit of fig. 23 the gain v out /v in is greater than unity, approximately 1+r2/r1. the dc output (v cc /2) is fixed by an auxiliary amp lifier common to all the channels. by controlling the amount of this local feedbackit is possible to force the loop gain (a* ) to less than unity at frequency for which the phase shift is 180. this m eans that the output buffer is intrinsically stableand not prone to oscillation. most remarkably, the above feature has been achieved in spite of the very low closed loop gain of the amplifier. in contrast, with the classical pnp-npn stage, the solution adopted for reducing the gain at high frequencies makes use of external rc networks, namely the boucherot cells. 5.6 built?in shortcircuit protection figure 23. the new output stage reliable and safe operation, in presence of all kinds of short circuit involving the outputs is assured by built-in protectors. additionally to the ac/dc short circuit to gnd, to v s , across the speaker, a soft short condition is signalled out during the turn-on phase so assuring correct operation for the de- vice itself and for the loudspeaker. this particular kind of protection acts in a way to avoid that the device is turned on (by st-by) when a resistive path (less than 16 ohms) is present between the output and gnd. as the involved circuitry is nor- mally disabled when a current higher than 5ma is flowi ng into the st-by pin, it is important, in order not to disable it, to have the external current source driving the st-by pin limited to 5ma. this extrafunction becomes particularly attractive w hen, in the single ended configuration, one capacitor is shared between two outputs (see fig. 24). supposing that the output capacitor c out for anyreason is shorted, the loudspeaker will no t be damaged being this soft sh ort circuit condition revealed.
tda7375a 10/15 figure 24. 5.6.1 diagnostics facility the tda7375a is equipped with a diagnostic circuitry able to detect the following events: clipping in the output signal thermal shutdown output fault: ? short to gnd ? short to v s ? soft short at turn on the information is available across an open collector output (pin 10) through a current sinking when the event is detected a current sinking at pin 10 is trigge red when a certain distortion level is reached at any of the outputs. this function a llows gain compression possibility whenever the amplifier is overdriven. 5.6.2 thermal shutdown in this case the output 10 will signal the proximity of the junction temperature to the shutdown threshold. typically current sinking at pin 10 will start ~1 0c before the shutdown threshold is reached. figure 25. clipping detection waveforms
11/15 tda7375a figure 26. output fault waveforms (see fig. 27) figure 27. fault waveforms 5.7 handling of the diagnostics information as various kinds of information is available at the same pin (clipping detection, output fault, thermal prox- imity), this signal must be handled properly in order to discriminate each event. this could be done by taking into account the different timing of the diagnostic output during each case. normally the clip detector signalling produces a low level at pin 10 that is shorter referred to everyt kind of fault detection; based on this assumption an interface circuitry to differentiate the information
tda7375a 12/15 is representedin the following schematic.waveforms figure 28.
13/15 tda7375a figure 29. multiwatt 15 mechanical data & package dimensions outline and mechanical data 0016036 j dim. mm inch min. typ. max. min. typ. max. a5 0.197 b 2.65 0.104 c 1.6 0.063 d 1 0.039 e 0.49 0.55 0.019 0.022 f 0.66 0.75 0.026 0.030 g 1.02 1.27 1.52 0.040 0.050 0.060 g1 17.53 17.78 18.03 0.690 0.700 0.710 h1 19.6 0.772 h2 20.2 0.795 l 21.9 22.2 22.5 0.862 0.874 0.886 l1 21.7 22.1 22.5 0.854 0.87 0.886 l2 17.65 18.1 0.695 0.713 l3 17.25 17.5 17.75 0.679 0.689 0.699 l4 10.3 10.7 10.9 0.406 0.421 0.429 l7 2.65 2.9 0.104 0.114 m 4.25 4.55 4.85 0.167 0.179 0.191 m1 4.73 5.08 5.43 0.186 0.200 0.214 s 1.9 2.6 0.075 0.102 s1 1.9 2.6 0.075 0.102 dia1 3.65 3.85 0.144 0.152 multiwatt15 (vertical)
tda7375a 14/15 6 revision history table 5. revision history date revision description of changes july 2004 1 first issue in edocs march 2005 2 changed the style-sheet in compli ance to the new ?corporate technical pubblications design guide?. deleted package mukltiwatt15 horizontal
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