TDA7382 4 x 22w four bridge channels car radio amplifier high output power capability: 4 x 30w max./4 w eiaj 4 x 22w/4 w @ 14.4v, 1khz, 10% 4 x 18.5w/4 w @ 13.2v, 1khz, 10% clipping detector (thd = 10%) low distortion low output noise st-by function mute function automute at min. supply voltage de- tection low external component count: C internally fixed gain (26db) C no external compensation C no bootstrap capacitors protections: output short circuit to gnd, to v s , across the load very inductive loads overrating chip temperature with soft thermal limiter load dump voltage fortuitous open gnd reversed battery esd protection description the TDA7382 is a new technology class ab audio power amplifier in flexiwatt 25 package designed for high end car radio applications. thanks to the fully complementary pnp/npn out- put configuration the TDA7382 allows a rail to rail output voltage swing with no need of bootstrap capacitors. the extremely reduced components count allows very compact sets. the on-board clipping detector simplifies gain compression op- erations. march 2001 ? ordering number: TDA7382 in1 0.1 m f mute st-by in2 0.1 m f out1+ out1- out2+ out2- pw-gnd in3 0.1 m f in4 0.1 m f out3+ out3- out4+ out4- pw-gnd pw-gnd pw-gnd d98au818 ac-gnd 0.1 m f47 m f svr tab s-gnd vcc1 vcc2 100nf 2.200 m f clipping det. block and application diagram flexiwatt25 1/10
d98au820 tab p-gnd out2- st-by out2+ v cc out1- p-gnd1 out1+ svr in1 in2 s-gnd in4 in3 ac-gnd out3+ p-gnd3 out3- v cc out4+ mute out4- p-gnd4 clip. det. 1 25 pin connection (top view) absolute maximum ratings symbol parameter value unit v cc operating supply voltage 18 v v cc (dc) dc supply voltage 28 v v cc (pk) peak supply voltage (t = 50ms) 50 v i o output peak current: repetitive (duty cycle 10% at f = 10hz) non repetitive (t = 100 m s) 4.5 5.5 a a p tot power dissipation, (t case = 70 c) 80 w t j junction temperature 150 c t stg storage temperature C 55 to 150 c thermal data symbol parameter value unit r th j-case thermal resistance junction to case max. 1 c/w TDA7382 2/10
electrical characteristics (v s = 14.4v; f = 1khz; r g = 600 w ; r l = 4 w ; t amb = 25 c; refer to the test and application circuit (fig.1), unless otherwise specified.) symbol parameter test condition min. typ. max. unit i q1 quiescent current 85 180 300 ma v os output offset voltage 100 mv g v voltage gain 25 26 27 db p o output power thd = 10% thd = 1% thd = 10%; v s = 13.5v thd = 10%; v s = 14v thd = 5%; v s = 14v thd = 1%; v s = 14v thd = 10%; v s = 13.2v thd = 1%; v s = 13.2v 20 16.5 17 19 17 16 17 14 22 18 20 21 19 17 18.5 15 w w w w w w w w p o max max. output power eiaj rules 27.5 30 w thd distortion p o = 4w 0.04 0.3 % e no output noise "a" weighted bw = 20hz to 20khz 50 65 120 150 m v m v svr supply voltage rejection f = 100hz 50 65 db f cl low cut-off frequency 20 hz f ch high cut-off frequency 75 khz r i input impedance 60 100 130 k w c t cross talk f = 1khz 50 70 db i sb st-by current consumption st-by = low 20 50 m a v sb out st-by out threshold voltage (amp: on) 3.5 v v sb in st-by in threshold voltage (amp: off) 1.5 v a m mute attenuation v o = 1vrms 80 90 db v m out mute out threshold voltage (amp: play) 3.5 v v m in mute in threshold voltage (amp: mute) 1.5 v i m (l) muting pin current v mute = 1.5v (source current) 51316 m a cdl clipping detection thd level 5 10 15 % TDA7382 3/10
in1 0.1 m f c9 1 m f in2 c2 0.1 m f out1 out2 in3 c3 0.1 m f in4 c4 0.1 m f out3 out4 d98au819 c5 0.1 m f c6 47 m f svr tab vcc1-2 vcc3-4 c8 0.1 m f c7 2200 m f c10 1 m f st-by r1 10k r2 47k mute c1 14 15 12 11 22 4 13 s-gnd 16 10 25 1 clipping det. 620 9 8 7 5 2 3 17 18 19 21 24 23 figure 1: standard test and application circuit TDA7382 4/10
TDA7382 figure 2: p.c.b. and component layout of the figure 1 (1:1 scale) components & top copper layer bottom copper layer TDA7382 5/10
figure 3: quiescent current vs. supply voltage figure 4: quiescent output voltage vs. supply voltage figure 5: output power vs. supply voltage figure 6: distortion vs. output power figure 7: distortion vs. frequency. figure 8: supply voltage rejection vs. frequency by varying c6 r g = 600 w v ripple = 1vrms TDA7382 6/10
figure 9: output noise vs. source resistance figure 10: power dissipation & efficiency vs. output power r g ( w ) p tot (w) p tot input stage the TDA7382s inputs are ground-compatible and can stand very high input signals ( 8vpk) without any performances degradation. if the standard value for the input capacitors (0.1 m f) is adopted, the low frequency cut-off will amount to 16 hz. stand-by and muting stand-by and muting facilities are both cmos-compatible. if unused, a straight con- nection to vs of their respective pins would be ad- missible. conventional low-power transistors can be employed to drive muting and stand-by pins in absence of true cmos ports or microprocessors. r-c cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. since a dc current of about 10 ua normally flows out of pin 22, the maximum allowable muting-se- ries resistance (r 2 ) is 70k w , which is sufficiently high to permit a muting capacitor reasonably small (about 1 m f). if r 2 is higher than recommended, the involved risk will be that the voltage at pin 22 may rise to above the 1.5 v threshold voltage and the device will consequently fail to turn off when the mute line is brought down. about the stand-by, the time constant to be as- + - 0.1 m f c1 c4 + - 8k w 8k w 400 w 400 w 100k w 100k w 70k w in d95au302 towards other channels 10k w 10k w v s 47 m f c6 0.1 m f c5 svr ac_gnd figure 11: input/output biasing. TDA7382 7/10
signed in order to obtain a virtually pop-free tran- sition has to be slower than 2.5v/ms. clipping detector the clipping detector acts in a way to out- put a signal as soon as one or more outputs reach or trespass a typical thd level of 10%. as a result, the clipping-related signal at pin 25 takes the form of pulses, which are syncronized with each single clipping event in the music pro- gram. applications making use of this facility usually operate a filtering/integration of the pulses train through passive r-c networks and realize a volume (or tone bass) stepping down in associa- tion with microprocessor-driven audioprocessors. the maximum load that pin 25 can sustain is 1k w . due to its operating principles, the clipping detec- tor has to be viewed mainly as a power-depend- ent feature rather than frequency-dependent. this means that clipping state causing thd = 10% typ. will be immediately signaled out whenever a fixed power level is reached, regardless of the audio frequency. in other words, this feature offers the means to counteract the extremely sound-damaging effects of heavy clipping, caused by a sudden increase of odd order harmonics and appearance of serious intermodulation phenomena. vref r vpin 25 25 d97au810 TDA7382 figure 12: diagnostics circuit. audio output signal clipping det. output curr. time d97au811 v o iclip 0 figure 13: clipping detection waveforms. t t t mute pin voltage vs output waveform vpin 25 waveform d97au812a clipping st-by pin voltage t figure 14: diagnostics waveforms. TDA7382 8/10
flexiwatt25 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 23.75 24.00 24.25 0.935 0.945 0.955 h (2) 28.90 29.23 29.30 1.138 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 h3 r4 g v g1 l2 h1 h f m1 l flex25me 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 outline and mechanical data TDA7382 9/10
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsib ility for the cons equences 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. specification mentioned in this pu blication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics ? 2001 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com TDA7382 10/10
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