AP432/AP432A
Adjustable Precision Shunt Regulator
Application Examples
VIN
VIN
I
OUT
RCL
R
VIN
R1B
R2B
R1A
R2A
+
ON
OFF
VIN
Delay =
)
RC x ln(
IOUT = VREF / RCL
LED on when Low Limit VIN High Limit
V
＜
＜
IN -VREF
≈
Low Limit VREF (1+R1B/R2B)
≈
High Limit VREF (1+R1A/R2A)
Fig.5 Delay Timer
Fig.4 Voltage Monitor
Fig.6 Current Limiter or Current Source
VIN
IOUT
VIN
VOUT
VIN
VOUT
PUSE
R1
R1
R2
R2
V
RS
L
IMIT
(1 + R1/R2) ×VREF
OUT = (1 + R1/R2) ×VREF
I
OUT = VREF / RS
Fig.7 Constant-Current Sink
Fig.8 Higher-Current Shunt Regulator
Fig.9 Crow Bar
VIN
R1A
R2A
R1B
Output ON when
Low Limint High Limit
＜VIN＜
+
VBE
R2B
Low Limit
High Limit
V
REF(1 + R1B/R2B) +VBE
V
REF(1 + R1A/R2A)
Fig.10 Over-Voltage / Under-Voltage Protection Circuit
Anachip Corp.
www.anachip.com.tw
Rev.1.0 May.7, 2004
7/16
ANACHIP [ ANACHIP CORP ]
