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TDA7250 march 1995 60 w hi-fi dual audio driver . wide supply voltage range : 20 to 90 v ( 10 to 45 v) . very low distortion . automatic quiescent current control for the power transistors without temperature sense elements . overload current protection for the power transistors . mute/stand-by functions . low power consumption . output power 60 w/8 w and 100 w/4 w description the TDA7250 stereo audio driver is designed to drive two pair of complementary output transistor in the hi-fi power amplifiers. dip20 ordering number : TDA7250 application circuit 1/11
pin connection (top view) absolute maximum ratings symbol parameter value unit v s supply voltage 100 v p tot power dissipation at t amb = 60 c 1.4 w t j , t stg storage and junction temperature C 40 to + 150 c thermal data symbol parameter value unit r th j-amb thermal resistance junction-ambient max. 65 c/w TDA7250 2/11
pin functions n name function 1v s C power supply negative supply voltage. 2 nonCinv. inp. ch. 1 channel 1 input signal. 3 quiesc. current contr. cap. ch1 this capacitor works as an integrator, to control the quiescent current to output devices in no-signal conditions on channel 1. 4 sense (C) ch. 1 negative voltage sense input for overload protection and for automatic quiescent current control. 5 st. by / mute / play three-functions terminal. for v in = 1 to 3 v, the device is in mute and only quiescent current flows in the power stages ; - for v in < 1 v, the device is in stand-by mode and no quiescent current is present in the power stages ; - for v in > 3 v, the devic 6 current program high impedance power-stages monitor. 7 sense (C) ch. 2 negative voltage sense input for overload protection and for automatic quiescent current control. 8 quiesc. current contr. cap. ch. 2 this capacitor works as an integrator, to control the quiescent current to output devices in no-signal conditions on channel 2. if the voltage at its terminals drops under 250 mv, it also resets the device from high-impedance state of output stages. 9 nonCinv. inp. ch. 2 channel 2 input signals. 10 v s C power supply negative supply voltage. 11 invert. inp. ch. 2 feedback from output (channel 2). 12 out (C) ch. 2 out signal to lower driver transistor of channel 2. 13 out (+) ch. 2 out signal to higher driver transistor of channel 2. 14 sense (+) ch. 2 positive voltage sense input for overload protection and for automatic quiescent current control. 15 common ac ground ac input ground in mute condition. 16 v s + power supply positive supply voltage. 17 sense (+) ch. 1 positive voltage sense input for overload protection and for automatic quiescent current control. 18 out (+) ch. 1 out signal to high driver transistor of channel 1. 19 out (C) ch. 1 out signal to low driver transistor of channel 1. 20 invert. inp. ch. 1 feedback from output (channel 1). TDA7250 3/11
block diagram TDA7250 4/11
electrical characteristics (t amb = 25 c, v s = 35 v, play mode, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v s supply voltage 10 45 v i d quiescent drain current stand-by mode 8 ma play mode 10 14 i b input bias current 0.2 1 m a v os input offset voltage 1 10 mv i os input offset current 100 200 na g v open loop voltage gain f = 100 hz 90 db f = 10 khz 60 e n input noise voltage r g = 600 w b = 20 hz to 20 khz 3 m v sr slew rate 10 v/ m s d total harmonic distortion g v = 26 db, p o = 40 w f = 1 khz f = 20 khz 0.004 0.03 % % v opp output voltage swing 60 v pp p o output power (*) v s = 35 v, r l = 8 w v s = 30 v, r l = 8 w v s = 35 v, r l = 4 w 60 40 100 w w w i o output current 5ma svr supply voltage rejection f = 100 hz 75 db c s channel separation f = 1 khz 75 db mute / standby/ play functions symbol parameter test conditions min. typ. max. unit i i input current (pin 5) 0.1 m a v th comparator standby / mute threshold (**) 1.0 1.25 1.5 v h hysteresis standby / mute 200 mv v th comparator mute / play threshold (**) 2.4 3.0 3.6 v h hysteresis mute / play 300 mv mute attenuation f = 1 khz 60 db v i input voltage max. (pin 5) 12 (**) v current survey circuitry symbol parameter test conditions min. typ. max. unit comparator reference to + v s to C v s 0.8 0.8 1 1 1.4 1.4 v v t d delay time 10 m s (*) application circuit of fig. 1 f = 1 khz ; d = 0.1 % ; g v =26 db. (**) referred to - v s . quiescent current control symbol parameter test conditions min. typ. max. unit capacitor current charge discharge 30 250 60 500 m a m a comparator reference to + v s to C v s 10 20 10 25 mv mv TDA7250 5/11
figure 1 : application circuit with power darlingtons. note : q1/q2 = q3/q4 = tip 142/tip147 gv = 1 + r1/r2 TDA7250 6/11
figure 2 : output power vs. supply voltage. figure 4 : channel separation. figure 3 : distortion vs.output power (*). figure 5 : supply voltage rejection vs. frequency. figure 6 : quiescent current vs. supply voltage. figure 7 : quiescent current vs. t amb . TDA7250 7/11
figure 8 : total dissipated power vs. output powe r (*). figure 9 : efficiency vs. output power (*). figure 10 : play-mute standby operation. (*) complete circuit TDA7250 8/11
figure 11 : application circuit using power transistors. figure 12 : suggested transistor types for various loads and powers. 15w +30w +50w +70w bdx 53/54a bdx 53/54b bdw 93/94b tip 142/147 30w +50w +90w +130w bdw 93/94a bdw 93/94b bdv 64/65b mj 11013/11014 r l = 8 w t l = 4 w TDA7250 9/11
dip20 package mechanical data dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 0.85 1.40 0.033 0.055 b 0.50 0.020 b1 0.38 0.50 0.015 0.020 d 24.80 0.976 e 8.80 0.346 e 2.54 0.100 e3 22.86 0.900 f 7.10 0.280 i 5.10 0.201 l 3.30 0.130 z 1.27 0.050 TDA7250 10/11
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any inf ringement of patents or other rights of third part ies which may result from its use. no license is granted by impl ication or otherwise under any pat ent or patent rights of sgs-thomson microelectronics. specifica- tions mentioned in t his publication are subject to change without noti ce. this publication supersedes and replaces all information pre- viously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelec tronics. ? 1995 sgs-thomson microelectronics - all rights reserved sgs-thomson microelectronics group of companies aust ralia - brazil - france - germany - hong kong - i taly - j apan - korea - malaysia - malta - morocco - the netherlands - sin gapore - spain - sweden - switzerland - taiwan - thaliand - united k ingdom - u.s.a. TDA7250 11/11

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