unisonic technologies co., ltd a7240 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2013 unisonic technologies co., ltd qw-r107-048.c 20w bridge amplifier for car radio ? description the utc a7240 is a 20w bridge audio amplifier ic and designed for car radio applications. a comprehensive array of on-chip protection, include protection against ac and dc output short circuits (to ground and across the load), load dump transients, and junc tion over temperature, is feature to provide reliable o peration. furthermore, the utc a7240 protects the loudspeaker when one output is short-circuited to ground. ? features * few external components * output protected against s hort circuits to ground and across load * dump transient * thermal shutdown * loudspeaker protection * high current capability * low distortion/low noise ? ordering information order number package packing lead free halogen free a7240l-tb7-t A7240G-TB7-T to-220z7 tube
a7240 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r107-048.c ? pin configuration tab connected to pin 4 1 2 3 4 5 6 7 output supply voltage output gnd input sub and stand-by feedback
a7240 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r107-048.c ? absolute maximum ratings parameter symbol ratings unit operating supply voltage v ss 18 v dc supply voltage v ss 28 v peak supply voltage (for 50ms) v ss ( peak ) 40 v peak output current (non repetitive t = 0.1ms) i o ( peak ) (*) 4.5 a peak output current (re petitive f .10hz) i o ( peak ) (*) 3.5 a power dissipation at t c = 85c p d 16 w storage and junction temperature t stg , t j -40~+150 ? c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. (*) internally limited ? thermal data parameter symbol ratings unit junction to case jc 4 c/w ? electrical characteristics (ta = 25c, r th (heatsink)= 4c/w, v ss = 14.4v) parameter symbol test conditions min typ max unit supply voltage v ss 18 v output offset voltage v o ( off ) 150 mv total quiescent current i q r l =4 ? 65 120 ma output power p out f = 1khz, d= 10% r l =4 ? 18 20 w r l =8 ? 10 12 distortion thd f = 1khz, p out = 50mw ~ 12w r l =4 ? 0.1 0.5 % r l =8 ? 0.05 0.5 voltage gain g v f = 1khz 39.5 40 40.5 db supply voltage rejection svr f = 100hz, rg = 10k ? 35 40 db total input noise en rg = 10k ? b= curve a 2 v b = 22hz~22khz 3 10 efficiency r l =4 ? , f = 1khz 65 % input resistance r in f = 1khz 70 k ? input sensitivity v in f = 1khz, p out = 2w, r l =4 ? 28 mv frequency roll off (-3db) low f l p out = 15w, r l =4 ? 30 hz high f h 25 khz stand-by threshold v thd ( pin2 ) 1 v stand-by current istn-by 200 a stand-by attenuation a stn-by v out = 2vrms 70 90 db
a7240 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r107-048.c ? test and application circuit c7 0.22 f r2 2.2 c5 0.1 f 6 7 5 4 1 2 3 utc a7240 c4 220 f c1 1 f c2 22 f c3 22 f c6 0.22 f r1 2.2 out input +v ss standby component usage suggestion component suggest purpose larger than smaller than r1, r2 2.2w frequency stability danger of high frequency oscillation c1 1 f input dc decoupling higher turn on and stand-by delay higher turn on pop. higher low frequency cutoff c2 22 f ripple rejection increase of svr increase of the turn on delay degradation of svr c3 22 f feedback low frequency cutoff higher low frequency cutoff c4 220 f supply filter danger of oscillation c5 0.1 f supply bypass danger of oscillation c6, c7 0.22 f frequency stability danger of oscillation
a7240 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r107-048.c ? typical characteristics 9101112131415 v s (v) 6 10 14 18 22 outputpower vs. supply voltage 2 5 10 14 p d (w) 0 2 4 6 8 distortion vs. output power v ss = 10% r l = 4 f = 1khz v ss = 14.4v r l = 4 f = 1khz p d (w) thd (%)
a7240 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r107-048.c utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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