Diodes AP432_A - Manual (Page 6)

AP432/AP432A
Document number: DS31003 Rev. 18 - 2
6 of 15
www.diodes.com
September 2012
© Diodes Incorporated
AP432/AP432A
Application Examples
V IN
+
Low Limit V
REF
(1 + R1B/R2B) +V
BE
High Limit V
REF
(1 + R1A/R2A)
R1A R1B
R2A R2B
V BE
Output ON when
Low Limit < < High Limit
Fig.10 Over-Voltage / Under-Voltage Protection Circuit
V
IN
R
CL
I
OUT
I
OUT
= V
REF
/ R
CL
Fig. 6 Current Limiter or Current
Source
I
OUT
V
IN
I
OUT
= V
REF
/ R S
R S
Fig. 7 Constant-Current
Sink
Fig. 4 Voltage
Monitor
Fig. 5 Delay
Timer
V
OUT
= (1 + R1/R2) x V
REF
V
IN
R1
R2
Fig. 8 Higher-Current Shunt
Regulator
V
OUT
V
IN
PULSE
R1
R2
L IMIT (1 + R1/R2) x V
REF
Fig. 9 Crow Bar
V
OUT
V
IN
ON
OFF
R
+
V
IN Delay = RC x ln (
V
IN
-V
REF
)
LED on when Low Limit
IN
High Limit
Low Limit ≈ V
REF
(1+R1B/R2B)
High Limit ≈ V
REF
(1+R1A/R2A)
R1A
R2A
V
IN
R1B
R2B
<
V IN