TL431LINEAR INTEGRATED CIRCUIT TEST CIRCUIT INPUT VKA IKA UTC TL431 VREF VKA=VREF×(1+R1/R2)+IREF×R1 For VKA=VREF For VKA≥VREF For IKA(OFF) APPLICATION CIRCUIT V V OUT=(1+R1/R2)×VREF OUT=(1+R1/R2)×VREF V Minimum V OUT=(1+R1/R2)×VREF OUT=VREF+5V Output Control of a Three Shutdown Regulator Higher-current Shunt Regulator -Terminal Fixed Regulator V V OUT IN I IOUT V OUT IN VOUT RCL RS RS UTC UTC TL431 TL431 IOUT=VREF/RS IOUT =VREF/RCL Constant-current Sink Current Limiting or Current Source UNISONIC TECHNOLOGIES CO., LTD 5 of 7 www.unisonic.com.tw QW-R103-003.AF
