AIC431/TL431A/TL431
n SYMBOL
CATHODE (C)
REF (R)
AIC431
ANODE (A)
n BLOCK DIAGRAM
REF (R)
+
-
2.495V
ANODE (A)
n APPLICATION EXAMPLES
VIN
R1B
R1A
AIC431
R2A
AIC431
R2B
LED on when Low Limit<VIN< High Limit
l Low Limit ≅ VREF (1+R1B/R2B)
Delay=R x C x n ( VIN )
VIN− VREF
High Limit ≅ VREF (1+R1A/R2A)
Fig. 4 Voltage Monitor
VIN
R
ON
OFF
+
AIC431
C
Fig. 5Delay Timer
RCL IOUT
VIN
AIC431
IOUT=VREF/ RCL
Fig. 6 Current Limiter or Current Source
VIN
IOUT
AIC431
RS
IOUT=VREF /RS
Fig. 7 Constant-Current Sink
8