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  UTC386 li near i ntegrated ci rcui t  youw ang electroni cs co. ltd  1  low voltage audio power amplifier description the UTC386 is a power amplifier designed for use in low voltage consumer applications. the gain is internally set to 20 keep the external part count low, but the additional of external resistor and capacitor between pin 1 and pin 8 will increase the gain to any value up to 200. features *battery operation *minimum external parts *wide supply voltage range:4v~12v *low quiescent current drain(4ma) *voltage gains:20~200 *ground referenced input *self -centering output quiescent voltage *low distortion dip-8  block diagram 6 vcc 4 gnd 2 -input 7 bypass 8 gain 1 gain 15k  3 +input 15k  15k  1.35k  150  50k  50k  1 2 3 45 6 7 8 5 output gain vcc output gnd +input -input gain bypass UTC386   absolute maximum ratings (ta=25 c ) characteristic symbol value unit supply voltage vcc 15 v power dissipation pd 660 mw input voltage vi -0.4~+0.4 v operating temperature topr -20 to 70 c storage temperature tstg -40 to 125 c   
UTC386 li near i ntegrated ci rcui t  youw ang electroni cs co. ltd  2  electrical characteristics (vcc=6v,f=1khz,ta=25 c, all voltage referenced to gnd unless otherwise specified) characteristic symbol test condition min typ. max unit quiescent circuit current i ccq vi=0 4 8 ma vcc=6v,r l =8 w ,thd=10% 250 325 mw output power po vcc=9v,r l =16 w ,thd=10% 500 mw pin1 and pin 8 open 24 26 28 db voltage gain g v 10 m f from pin 1 and pin 8 43 46 49 db pin1 and pin 8 open 300 khz bandwidth bw 10 m ffronpin1andpin8 60 khz total harmonic distortion thd vcc=6v,r l =8 w ,po=125mw, f=1khz, pin1 and pin 8 open 0.2 % power supply volatge rejection ratio svr vcc=6v,f=1khz, c bypass =10 m f, pin1 and pin 8 open 30 db input resistance ri pin2 and pin 3 open 50 k w input bias current i bias pin1 and pin 8 open 250 na typical application ciruit UTC386 2 6 1 8 4 7 5 3 vs vin 250 f 0.05 f 10  10k  fig. 1 g v =20db UTC386 2 6 1 8 4 7 5 3 10 f 250 f 0.05 f 10  10k  vin vs bypass fig. 2 g v =200


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