LL431
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
For VKA=VREF
APPLICATION CIRCUIT
VIN
VoUT
R1
VREF
R2
UTC LL431
VOUT=(1+R1/R2)*VREF
Shutdown Regulator
For VKA≧ VREF
For IKA(OFF)
VIN
IN
UTC7805 OUT
COMMON
VoUT
R1
UTC LL431
VREF
R2
VOUT=(1+R1/R2)*VREF
Output Control of a Three
-Terminal Fixed Regulator
VIN
VoUT
R1
VREF
R2
UTC LL431
VOUT=(1+R1/R2)*VREF
Higher-current Shunt Regulator
Constant-current Sink
Current Limiting or Current Source
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 5
QW-R121-020.I