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tda7396 45w/2 w bridge car radio amplifier with diagnostic facility high power capability: - 65w/2 w max - 60w/2 w eiaj - 45w/2 w @ v s = 14.4v, f = 1khz, d = 10% differential inputs (either single ended or differential input signals are accepted) minimum external component count: - no bootstrap capacitors - no boucherot cells - internally fixed gain (26db) - no svr capacitor st.-by function (cmos compatible) automatic mute during turn-on/off automute at minimum supply voltage detection synchronizing pin for simultaneous turn-on in multi-device applications no audible pop during mute and st- by operations diagnostic facilities: clipping detector short circuit open load thermal shutdown protections: short circuit (to gnd, to v s, across the load) very inductive loads chip over-temperature load dump open gnd esd this is advanced information on a new product now in development or undergoing evaluation. details are subject to change withou t notice. september 2013 ? 1 2 11 in- 0.22mf 0.22mf in+ 8 standby to mc or v s 10 6 out+ out- 7 5 4 vref cd-dia tda7396 d93au004 10kw 1000mf gnd rs 51kw cm 10mf 100nf 39 to mc +v s figure 1: test and application circuit multiwatt11 ordering number: tda7396 1/11
description the tda7396 is a bridge class ab audio power amplifier especially intended for car radio high power applications. the 2 w power capability together with the possi- bility to operate either in differential input mode or single ended input mode makes it suitable for boosters and high end car radio ap- plications. the exclusive fully complementary output stage and the internally fixed gain configuration drop the external component count. the on board clipping detector allows easy imple- mentation of gain compression systems. the diagnostics facility allows to detect any mis- takes during car radio set assembly and wiring in the car. + - 39 v cc1 v cc2 references standby threshold short circuit dump & thermal protection icm 1 2 500 w 500 w common mode - + v cc/2 - + gm + - mute threshold programmable current circuit diagnostic circuit 10k 10k lt s v=f (tj) power amp power amp thd detect lt s disable 10 11 8 5 4 7 in- in+ out- diagn cd out+ 6 mute sync gnd standby d94au107 figure 2: block diagram thermal data symbol description value unit r th j-case thermal resistance junction-case max 1.5 c/w 1 2 3 4 5 6 7 d93au003a 9 10 11 8 mute sync +v s stand-by out+ gnd out- cd-dia (clipping detector - diag.) +v s in+ in- tab connected to pin 6 pin connection (top view) tda7396 2/11
absolute maximum ratings symbol parameter value unit v s dc supply voltage 28 v v op operating supply voltage 18 v v peak peak supply voltage (t = 50ms) 50 v i o output peak current repetitive (f > 10hz) output peak current non repetitive 6 7 a a p tot power dissipation (t case = 85 c) 43 w t stg , t j storage and junction-case -40 to 150 c electrical characteristics (v s = 14.4v; r l = 2 w , f = 1khz, t amb = 25c, unless otherwise specified) symbol parameter test condition min. typ. max. unit v s supply voltage range 8 18 v i q total quiescent current 100 ma v os output offset voltage 150 mv i sb st-by current v st-by = 1.5v 100 m a i sbin st-by input bias current v st-by = 5v 10 m a v sbon st-by on threshold voltage 1.5 v v sboff st-by off threshold voltage 3.5 v att st-by st-by attenuation 90 db r ext /r s mute resistor ratio for external mute control (see application circuit of fig. 4) 0.63 0.69 v i m in mute input bias current v mute = 5v 10 m a a m mute attenuation 90 db p o rms output power d = 10% d = 1% d = 10%; r l = 4 w 45 35 27 w w w eiaj output power v s = 13.7v 60 w d distortion p o = 0.1 to 20w p o = 0.1 to 15w; r l = 4 w 0.06 0.03 % % g v voltage gain 25 26 27 db f h high frequency rolloff p o = 1w; -3db 75 khz r in input impedance differential 60 k w single ended 55 k w e in input noise voltage r g = 0 w ; f = 22hz to 22khz 4 m v cmrr input common mode rejection f = 1khz; v in = 1vrms 70 db svr supply voltage rejection r g = 0 w ; v r = 1vrms 60 db cdl clipping detection level 0.5 % t sd absolute thermal shutdown junction temperature 160 db tda7396 3/11
functional description pin function description 1, 2 inputs the input stage is a high impedance differential type also capable of operation in single ended mode with one input capacitively coupled to the signal gnd. the impedance seen by the inverting and non inverting input pins must be matched. 4 cd - dia the tda7396 is equipped with a diagnostics circuitry able to detect the following events: - clipping in the output signal - thermal shutdown - open load (before turn-on) - shorted output: to gnd, to vs, across the load (after turn-on) the cd-dia(open collector) pin gives out the diagnostics signal (low during clipping or output fault condition). the device does not work as long as the faulty condition holds; the normal operation is automatically restored after the fault removal. 5, 7 outputs the output stage is a bridge type able to drive loads as high as 2 w . it consists of two class ab fully complementary pnp/npn stages fully protected. a rail to rail output voltage swing is achieved with no need of bootstrap capacitors. no external compensation is necessary. 8 stand-by the device features a st-by function which shuts down all the internal bias supplies when the st-by input is low. in st-by mode the amplifier sinks a small current (in the range of few m a). when the st-by pin is high the ic becomes fully operational. 10 sync a resistor (r s ) has to be connect between pin 10 and gnd in order to program the current that flows into c m capacitor (pin 11). the values of c m and r s determine the time required to bias the amplifier. 11 mute a) the pin will have a capacitor (c m ) tied to gnd to set the mute/stand-by time. an automatic mute during turn on/off is provided to prevent noisy transients b) if a independent mute function is needed, an external transistor circuit (see fig. 4) may be connected to this pin; 1% precision resistors have to be used for r ext / r s in to order to reach the fixed limits 0.63 r ext / r s 0.69 1 2 11 in- 0.22 m f 0.22 m f in+ 8 standby to m c or v s 10 6 out+ out- 7 5 4 vref cd-dia tda7396 d93au007 10k w 1000 m f gnd rs cm 100nf 39 to m c +v s rext to m c figure 3: application circuit with external mute control tda7396 4/11
figure 4: quiescent current vs supply voltage figure 5: eiaj power vs supply voltage figure 6: output power vs supply voltage (r l =2 w ) figure 7: distortion vs frequency (r l =2 w ) figure 8: output power vs supply voltage (r l =4 w ) figure 9: distortion vs frequency (r l =4 w ) r l = 2 w r l = 4 w r l = 2 w f = 1khz v s = 14.4v r l = 2 w p o = 18w f (hz) v s = 14.4v r l = 4 w p o = 15w r l = 4 w f = 1khz f (hz) tda7396 5/11
figure 10: supply voltage rejection vs fre- quency figure 11: common mode rejection vs. fre- quency figure 12: total power dissipation & efficiency vs. output power (r l = 2 w ) figure 13: total power dissipation & efficiency vs. output power (r l = 4 w ) f (hz) f (hz) v s = 14.4v r l = 4 w f = 1khz v s = 14.4v r l = 2 w f = 1khz v s = 14.4v v r = 1vrms r l = 2 w r g = 0 v s = 14.4v v cm = 1vrms r l = 2 w r g = 0 tda7396 6/11
1 2 11 in- c2 0.22 m f c1 0.22 m f in+ 8 st-by 10 6 out+ out- 7 5 4 5v cd-dia tda7396 d93au108 r3 100k w c4 1000 m f gnd r2 51k w c3 10 m f c5 100nf 39 to m c +v s v s sw1 j1 r1 15k w c6 100nf figure 14: application circuit figure 15: p.c. board and component layout (1:1 scale) tda7396 7/11
clipping detection & diagnostics (see fig. 16) an active pull-down circuit is provided to signal out the occurrence of any of the conditions de- scribed later. in order to use this function, the cd- dia pin (#4) has to be resistively connected to a positive voltage reference (between 5v and vs). a) clipping detection current is sunk whenever the output clipping dis- tortion level reaches a fixed 0.5% threshold; this function allows gain compression facility when the amplifier is overdriven. b) output fault diagnostics current is sunk as soon as one of the following output faults is recognized: - short-circuit to gnd - short-circuit to vs - short-circuit across the load (after turn-on) - open load (before turn-on) the diagnostics signal remains steadily on until the fault is removed. all the output fault conditions (listed above) can be distinguished from the clipping detection (a) because of their different time duration. thermal warning (see fig. 17) thermal protection has been implemented in ac- cordance to a new principle involving different steps: 1) thermal foldback ( l inear t hermal s hutdown) 2) shutdown with soft restart ( a bsolute t hermal s hutdown) as long as the junction temperature remains be- low the preset threshold (140 c) the ic delivers the full power. once the threshold has been reached, a thermal foldback starts limiting the out- put signal level; the output power is then reduced, thus decreasing also the temperature without out- put signal interruption (lts). supposing the ther- mal foldback does not reduce the junction tem- perature to a safe level, a complete shutdown will occur at 160 c (ats). soft restart avoids large voltage disturbance across the loudspeaker, due to the presence of high input signals when the ic comes out of ther- mal shutdown. current is sunk from the cd-dia pin (#4)when the thermal protection is acting. the voltage at pin #4 bounces back and forth (depending on the ampli- fier input signal magnitude) during the linear ther- mal intervention (lts) and stays low (sinking cur- rent) after the amplifier has been eventually shut-down (absolute thermal shutdown) d93au005a clipping detector/ diagnostics output (pin 4) vo 0 clipping s/c to gnd normal operation fault diagnostics normal operation figure 16: clipping detection & diagnostics waveforms tda7396 8/11
d93au006a 0 diagnostics output (pin 4) linear thermal shut down abs thermal shutdown 140c 160c max output voltage swing figure 17: thermal protection & diagnostic waveforms tda7396 9/11
multiwatt11 v dim. mm inch min. typ. max. min. typ. max. a 5 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 0.88 0.95 0.035 0.037 g 1.45 1.7 1.95 0.057 0.067 0.077 g1 16.75 17 17.25 0.659 0.669 0.679 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 17.4 18.1 0.685 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 outline and mechanical data tda7396 10/11
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