ics for audio common use 1 AN7125 dual channel btl power amplifier n overview AN7125 is a monolithic integrated circuit designed for 13.5 w (12 v,4 w ) output audio power amplifier.it is a dual channel btl ic suitable for stereo operation in radio cassette and tv application. n features built-in muting pin built-in stand by pin built-in thermal shutdown protection circuit built-in current limiting circuit high power : (13.5 w/12 v/4 w ) (13.0 w/15 v/8 w ) few external components operating voltage range 6 v ~ 18 v (12 v typ.) n applications radio-cassette n block diagram hsip012-p-0000a unit : mm ref mute tsd protection circuit standby circuit v cc gnd gnd gnd 1 2 3 4 5 6 7 8 9 10 11 12 7.70.3 (12.5) 19.10.3 21.90.3 (1.2) (10.0) (10.0) 29.60.3 20.00.3 0.6 28.00.3 29.750.30 f 3.6 r1.8 0.6 (1.27) (1.27) (1.3) 12 1 +0.15 C0.05 2.54 0.25 1.450.15 1.800.15 1.20.1 3.50.3 +0.10 C0.05
2 AN7125 ics for audio common use n absolute maximum ratings parameter symbol ratings unit supply voltage *1 v cc 24 v supply current i cc 6.0 a power dissipation * 2 p d 38.5 w operating ambient temperature t opr - 25 to + 75 c storage temperature t stg - 55 to + 150 c n recommended operating range parameter symbol range unit supply voltage v cc 6.0 to 18.0 v note) * 1 : without input signal,v cc is up to 24 v * 2 :t a = 75 c. n electrical caracteristics at v cc = 12 v, r l = 4 w , freq. = 1 khz, 2 channel outputs, t a = 25 c parameter symbol conditions min typ max unit quiescent circuit current i cq v in = 0 mv ? 100 210 ma output noise voltage *1 v no v in = 0 mv,r g = 6.2 k w? 0.27 0.5 mvrms voltage gain g vc v in = 20 mv 38 40 42 db total harmonic distortion *2 thd v in = 20 mv ? 0.07 0.4 % maximum output power p o thd = 10 % 10 12 ? w channel balance cb v in = 20 mv - 10 1db channel crosstalk *2 ct v in = 20 mv,r g = 6.2 k w 55 70 ? db output offset voltage v off r g = 6.2 k w- 350 0 350 mv ripple rejection *1 rr v r = 1 v rms ,f r = 120 hz,r g = 6.2 k w 50 60 ? db standby current i stb v in = 0 mv ? 110 m a muting effects *2 mt v in = 20 mv 70 80 ? db pin no. description 1v cc 2 ch.1 + ve phase output 3 ch.1 output gnd 4 ch.1 - ve phase output 5 standby 6 ch.1 input pin no. description 7 pre gnd 8 ch.2 input 9 mute 10 ch.2 - ve phase output 11 ch.2 output gnd 12 ch.2 + ve phase output n pin descriptions note) * 1 : with a filter band 20 hz to 20 khz(12 db/oct)used. * 2 : with a filter band 400 hz to 30 khz used.
ics for audio common use AN7125 3 n terminal equivalent circuit pin no. equivalent circuit function status 1 ? v cc : typ. : 12 v v cc input 2 ch.1 o/p : v cc /2 ch.1 positive phase output pin. 3 ch.1 power gnd : 0 v ch.1 output power ground pin. 4 ch.1 o/p : v cc /2 ch.1 inverse phase output pin. 5 standby : v th = 2.8 v this is the standby control pin. stb off > 3.5 v stb on = 0 v/gnd 6 ch.1 input : 0 v this is the amplifier input pin. 7 ? pre gnd : 0 v input ground pin. 30 k w ???s? 600 w pin2 4 3 1 ???s? ??? v cc /2 5 1 8 100 w 5 k w 2 k w 30 k w 2 k w 10 k w 100 w 5 k w 7 pin6,8 200 w 30 k w 400 w
4 AN7125 ics for audio common use n terminal equivalent circuit(continued) pin no. equivalent circuit function status 8 ch.2 input : 0 v this is the amplifier input pin. 9 mute : v th = 1.5 v mute input pin. mute on > 2.5 v mute off = 0 v 10 ch.2 output : v cc /2 ch.2 inverse phase output pin 11 ch.2 power gnd : 0 v ch.2 output power ground 12 ch.2 output : v cc /2 ch.2 positive phase output pin 7 pin6,8 200 w 30 k w 400 w 3.2 k w 3.6 k w 20 k w 7 9 30 k w 600 w pin10 12 11 1 v cc /2 ???s? ???s? ???
ics for audio common use AN7125 5 n application circuit example n application ? s precautions 1. external heatsink is needed when used. external heatsink should be fixed to the chassis. 2. fin of the ic can be connected to gnd. 3. please prevent output to v cc short and output to gnd short. 4. the temperature protection circuit will operate at tj around 150 c. however, if temperature decrease, the protection circuit will automatically be decreased and resume normal operation. stb in2 in1 6 v cc input gnd 5 9 8 2 3 4 7 1 10 11 12 2.2 w r l 4 w v cc 12 v 0.22 m f 2200 m f 2.2 w 0.22 m f output1 gnd out1 out1 2.2 w r l 4 w 0.22 m f 2.2 w 0.22 m f output2 gnd out2 out2 51 k w 10 m f cs 5 v mute stb 'off' stb 'on' mute 'off' mute 'on' 5 v 0 v 0 v 5 v 8.2 k w 33 m f cs
6 AN7125 ics for audio common use n technical information hsip012-p-0000a p d ? t a 1. t c = t a ,62.5 w ( q j-c = 2 c/w) 2. 20.83 w ( q f = 4.0 c/w) with a 100 cm 2 x 3 mm al heat sink (black colour coated) or a 200 cm 2 x 2 mm al heat sink (not lacquered) 3. 15.63 w ( q f = 6.0 c/w) with a 100 cm 2 x 2 mm al heat sink (not lacquered) 4. 3.0 w at t a = 25 c( q j-a = 42 c/w) without heat sink power dissipation p d (w) 0 0 25 150 ambient temperature t a ( c) 50 75 100 125 10 20 30 40 50 60 70 80 62.5 w 20.8 w 15.6 w 3.0 w (1) (2) (3) (4) area of safe operation i c (a) 0.1 t = 0.2 ms t = 1.0 ms t = 10 ms 1 2 50 100 v ce (v) 51020 0.2 0.5 1 2 5 10 v cemax = 30 v i cmax = 8 a
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