UTC820 li near i ntegrated ci rcui t youw ang electroni cs co. ltd 1 1.2w audio power amplifier description the UTC820 is a monolithic integrated circuit audio amplifier. it is designed for audio frequency class b amplifiers. features *wide operating supply voltage:vcc=3~14v *low quiescent supply current(icc=4ma,typical) *medium output power po=1.2w at vcc=9v,r l =8ohm ,thd=10% *good ripple rejection *minimum number of external parts required. dip-8 block diagram 1 2 3 4 8 7 6 5 ripple bootstrap vcc output cb nf input gnd absolute maximum ratings (ta=25 c) characteristic symbol value unit supply voltage vcc 16 v output peak current ipeak 1.5 a power dissipation p d 1.25 w operating temperature topr -20 ~ +70 c storage temperature tstg -40 ~ +150 c
UTC820 li near i ntegrated ci rcui t youw ang electroni cs co. ltd 2 electrical characteristics (ta=25 c,vcc=9v,f=1khz,rg=600 w ,rf=120 w ,rl=8 w ,unless otherwise specified) characteristic symbol test conditions min typ max units quiescent circuit current i ccq vi=0 4 12 ma vcc=9v,r l =4 w ,thd=10% 1.6 vcc=9v,r l =8 w ,thd=10% 0.9 1.2 output power po vcc=6v,r l =4 w ,thd=10% 0.75 w vcc=6v,r l =8 w ,thd=10% 0.4 0.5 vcc=12v,r l =8 w ,thd=10% 2 total harmonic distortion thd po=500mw 0.3 1.0 % open loop voltage gain gvo r f =0 75 db closed loop voltage gain gvc r f =120 w 33 36 39 db input resistance ri 5 m w output noise voltage v no r g =10k w bw(-3db)=50~20khz 0.3 1.0 mw test circuit UTC820 3 2 4 8 5 1 7 6 vcc r1 10k rf 120 r2 1 rl 4 r3 56 100 f/ 10v 100 f/ 16v cb 47 f/ 10v 0.1 f input output 0.1 f
UTC820 li near i ntegrated ci rcui t youw ang electroni cs co. ltd 3 typical characteristic performance fig 1 quienscent circuit current vs supply voltage fig 2 output power vs supply voltager fig 3 total harmonic distortion vs output power 4 0 8 12 16 20 0 4 8 vi=0 supply voltage(v) quiescent current(ma) 4 0 8 12 16 20 supply voltage(v) 0 0.4 0.8 1.6 2.0 1.2 output power(w) thd=10% f=1khz rf=120 rl=4 rl=8 rl=16 0 0.4 0.8 1.2 1.6 output power(w) total harmonic distortion ( %) 0 4 8 12 16 vcc=9v rl=8 rf=120 f=1khz 0 50 100 150 0 20 40 60 80 feedback resistance( ) closed loop voltage gain(db) fig 4 voltage gain vs feedback resistance fig 5 power dissipation vs output power vcc=9v rl=8 f=1khz 0 0.4 0.8 1.2 1.6 output power(w) 2.0 power dissipation(w) 0 0.25 0.5 power dissipation(w) 0 0.5 1.0 0481216 supply voltage(v) 20 rl=16 rl=8 rl=4 fig 6 power dissipation vs supply voltage vcc=9v rl=8 f=1khz fig 7 frequency response fig 8 total harmonic distortion vs frequency 10 10 3 10 2 10 4 10 5 10 10 3 10 2 10 4 10 5 0 0 2 3 4 5 frequency(hz) total harminoc distortion(%) frequency(hz) response(db) -5 -3 -1 1 3 cb=660pf cb=220pf rf=120 1 po=50mw po=500mw vcc=9v rl=8 rf=120
|
