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TDA7383 4 x 30w quad bridge car radio amplifier high output power capability: 4 x 35w/4 w max. 4 x 30w/4 w eiaj 4 x 22w/4 w @ 14.4v, 1khz, 10% 4 x 18.5w/4 w @ 13.2v, 1khz, 10% clipping detector low distortion low output noise st-by function mute function automute at min. supply voltage de- tection diagnostics facility for: C clipping C out to gnd short C out to v s short C thermal shutdown low external component count: C internally fixed gain (32db) 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 TDA7383 is a new technology class ab audio power amplifier in flexiwatt 25 package designed for high end car radio applications. march 2001 ? ordering number: TDA7383 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 d93au002c ac-gnd 0.1 m f47 m f svr tab s-gnd vcc1 vcc2 100nf 2.200 m f diagn. out block and application diagram flexiwatt25 1/12
d94au117b 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 diagnostics 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 thanks to the fully complementary pnp/npn out- put configuration the TDA7383 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 operations. the fault diagnostics makes it possible to detect mistakes during car- radio assembly and wiring in the car. description (continued) TDA7383 2/12
electrical characteristics (v s = 14.4v; f = 1khz; 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 180 300 ma v os output offset voltage 200 mv g v voltage gain 31 32 33 db p o output power thd = 10% thd = 1% 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 19 17 16 17 14 22 18 21 19 17 18.5 15 w w w w w w w p o eiaj eiaj ouput power (*) vs = 13.7v 27.5 30 w p o max. max. output power (*) v s = 14.4v 33 35 w thd distortion p o = 4w 0.05 0.3 % e no output noise "a" weighted bw = 20hz to 20khz 75 100 150 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 70 100 k w c t cross talk f = 1khz 50 70 db i sb st-by current consumption st-by = low 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) 51016 m a i cdoff clipping detector "off" output average current thd = 1% (**) 100 m a i cdon clipping detector "on" output average current thd = 10% (**) 100 240 350 m a (*) saturated square wave output. (**) diagnostics output pulled-up to 5v with 10k w series resistor. TDA7383 3/12
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 d94au179b 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 diagnostics 620 9 8 7 5 2 3 17 18 19 21 24 23 figure 1: standard test and application circuit TDA7383 4/12
TDA7383 figure 2: p.c.b. and component layout of the figure 1 (1:1 scale) components & top copper layer bottom copper layer TDA7383 5/12
figure 3: quiescent current vs. supply voltage figure 4: quiescent output voltage vs. supply voltage figure 5: output power vs. supply voltage 0.1 1 10 po ( w ) 0 0.1 1 10 thd (%) vs= 14.4 v rl = 4 ohm f= 10 khz f= 1 khz figure 6: distortion vs. output power 10 100 1000 10000 f (hz) 0 0.1 1 10 thd (%) vs= 14.4 v rl = 4 ohm po= 1 w figure 7: distortion vs. frequency. 10 100 1000 10000 f ( hz ) 30 40 50 60 70 80 90 100 svr (db) rg= 600 ohm vripple= 1 vrms figure 8: supply voltage rejection vs. frequency TDA7383 6/12
1 10 100 1k 10k 100k r g ( ohm ) 40 60 80 100 120 140 160 180 200 en ( m v) vs= 14.4 v rl= 4 ohm 22 - 22k hz lin. "a" wgtd figure 9: output noise vs. source resistance ptot (w) figure 10: power dissipation & efficiency vs. output power application hints (ref. to the circuit of fig. 1) biasing and svr as shown by fig. 11, all the TDA7383s main sec- tions, such as inputs, outputs and ac-gnd (pin 16) are internally biased at half supply volt- age level (vs/2), which is derived from the supply voltage rejection (svr) block. in this way no cur- rent flows through the internal feedback network. the ac-gnd is common to all the 4 amplifiers and represents the connection point of all the in- verting inputs. both individual inputs and ac-gnd are con- nected to vs/2 (svr) by means of 100k w resis- tors. to ensure proper operation and high supply volt- age rejection, it is of fundamental importance to provide a good impedance matching between in- puts and ac-ground terminations. this im- plies that c 1 , c 2 , c 3 , c 4 , c 5 capacitors have to carry the same nominal value and their tolerance should never exceed 10 %. besides its contribution to the ripple rejection, the svr capacitor governs the turn on/off time se- quence and, consequently, plays an essential role in the pop optimization during on/off transients. to conveniently serve both needs, its minimum recommended value is 10 m f . + - 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. TDA7383 7/12
input stage the TDA7383s 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- signed in order to obtain a virtually pop-free tran- sition has to be slower than 2.5v/ms. diagnostics facility the TDA7383 is equipped with a diagnostics cir- cuitry able to detect the following events: clipping in the output stage overheating (thermal shut-down proximity) output misconnections (out-gnd & out-vs shorts) diagnostics information is available across an open collector output located at pin 25 (fig. 12) through a current sinking whenever at least one of the above events is recognized. among them, the clipping detector acts in a way to output a signal as soon as one or more power transistors start being saturated. as a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly syn- cronized with each single clipping event in the music program and reflect the same duration time (fig. 13). 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 will be immediately sig- naled 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 clipping, caused by a sudden increase of odd order harmonics and appearance of serious inter- modulation phenomena. another possible kind of distortion control could be the setting of a maximum allowable thd limit (e.g. 0.5 %) over the entire audio frequency range. besides offering no practical advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely to vary over fre- quency. in case of overheating , pin 25 will signal out the junction temperature proximity to the thermal shut-down threshold. this will typically start about 2 o c before the thermal shut-down threshold is vref r vpin 25 25 d95au303a figure 12: diagnostics circuit. figure 13: clipping detection waveforms. TDA7383 8/12
t t t mute pin voltage vs output waveform vpin 25 waveform short to gnd or to vs d95au304 clipping thermal proximity st-by pin voltage t figure 14: diagnostics waveforms. clip det. (to gain compressor/ tone control) t1 25 d95au305a + - vref vref1 t2 fault, thermal shutdown (to power supply section, m p voltage regulator, flashing system) + - vref2 t1 << t2 vref 3 vref1 >> vref2 figure 15. reached. as various kind of diagnostics information is avail- able at pin 25 (clipping, shorts and over- heating), it may be necessary to operate some distinctions on order to treat each event sepa- rately. this could be achieved by taking into ac- count the intrinsically different timing of the diag- nostics output under each circumstance. in fact, clipping will produce pulses normally much shorter than those present under faulty con- ditions. an example of circuit able to distinguish between the two occurrences is shown by fig. 15. stability and layout considerations if properly layouted and hooked to standard car- radio speakers, the TDA7383 will be intrinsically stable with no need of external compensations TDA7383 9/12
such as output r-c cells. due to the high number of channels involved, this translates into a very remarkable components saving if compared to similar devices on the market. to simplify pc-board layout designs, each ampli- fier stage has its own power ground externally ac- cessible (pins 2,8,18,24) and one supply voltage pin for each couple of them. even more important, this makes it possible to achieve the highest possible degree of separation among the channels, with remarkable benefits in terms of cross-talk and distortion features. about the layout grounding, it is particularly im- portant to connect the ac-gnd capacitor (c 5 ) to the signal gnd, as close as possible to the audio inputs ground: this will guarantee high rejection of any common mode spurious signals. the svr capacitor (c 6 ) has also to be connected to the signal gnd. supply filtering elements (c 7 , c 8 ) have naturally to be connected to the power-ground and located as close as possible to the vs pins. pin 1, which is mechanically attached to the de- vices tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supply filtering capacitors. TDA7383 10/12
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 TDA7383 11/12
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 - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com TDA7383 12/12

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