TDA7245A 6w audio amplifier with stand-by stand-by function supply voltage range up to 30v music power = 16w (r l = 4 w , d = 10%) thermal protection description the TDA7245A is a monolithic integrated circuit in 9+9 powerdip package, intended for use as low frequency power amplifier in a wide range of applications in radio and tv sets. may 1997 figure 1: test and application circuit powerdip 9+9 ordering number: TDA7245A 1/6
absolute maximum ratings symbol parameter value unit v s supply voltage 30 v i o output peak current (non repetitive t = 100 m s) 3 a i o output peak current (repetitive, f > 20hz) 2.5 a p tot power dissipation at t amb = 80 c at t case = 70 c 1 6 w w t stg , t j storage and junction temperature -40 to 150 c pin connection (top view) thermal data symbol description value unit r th j-case rth j-amb thermal resistance junction-case thermal resistance junction-ambient max max 15 70 c/w c/w figure 2: schematic diagram TDA7245A 2/6
electrical characteristics (refer to the test circuit, t amb = 25c, v s = 16.5v, r l = 4 w , f = 1khz; unless otherwise specified). symbol parameter test condition min. typ. max. unit v s supply voltage 12 30 v v o quiescent output voltage v s = 24v 11.6 v i d quiescent drain current v s = 28v 24 35 ma p o output power d = 1% v s = 16.5v, r l = 4 w v s = 20v, r l = 8 w d = 10% v s = 16.5v, r l = 4 w v s = 20v, r l = 8 w music power (*) v s = 24v, d = 10%, r l = 4 w 6.5 6 5 7.5 6.5 16 w w w w w d harmonic distortion p o = 50mw to 4w f = 1khz f = 10khz v s = 20v, r l = 8 w , p o = 50mw to 3.5w f = 1khz f = 10khz 0.15 0.8 0.12 0.5 0.5 % % % % r i input impedance f = 1khz 30 k w bw small signal bandwidth (-3db) p o = 1w 20 to 40,000 hz g v voltage gain (open loop) f = 1khz 75 db g v voltage gain (closed loop) f = 1khz 39 40 41 db e n total input noise b = 22 - 22,000hz r s = 50 w r s = 1k w r s = 10k w 1.7 2 36 mv m v m v s/n signal to noise ratio p o = 5w; r s = 10k w 86 db svr supply voltage rejection v s = 16.5v; r l = 8 w ; f = 100hz r s = 10k w; v r = 0.5vrms 38 45 db t sd thermal shut-down junction temperature 150 c stand-by function symbol parameter test condition min. typ. max. unit v st-by pin 5 dc voltage sw1 open (play) 6.4 v i st-by pin 5 current sw1 closed (st-by) 160 280 m a att st-by stand-by attenuation f = 1khz 70 90 db v t stand-by threshold (pin 5) 3.8 v i d st-by quiescent current @ stand-by 2 4 ma note (*): music power concept music power is ( according to the iec clauses n.268-3 of jan 83) the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1khz. according to this definition our method of measurement comprises the following steps: 1) set the voltage supply at the maximum operating value -20% 2) apply a input signal in the form of a 1khz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec 3) the output voltage is measured 1 sec from the start of the pulse 4) increase the input voltage until the output signal show a thd = 10% 5) the music power is then v 2 out /r1 , where v out is the output voltage measured in the condition of point 4) and r1 is the rated load impedance the target of this method is to avoid excessive dissipation in the amplifier. TDA7245A 3/6
figure 3: output power vs. supply voltage figure 4: output power vs. supply voltage TDA7245A 4/6
powerdip 18 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 20.32 0.800 f 7.10 0.280 i 5.10 0.201 l 3.30 0.130 z 2.54 0.100 TDA7245A 5/6
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 infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously s upplied. 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 microelectronics. ? 1997 sgs-thomson microelectronics C printed in italy C all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the n etherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. TDA7245A 6/6
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