AP431Q DIODES [Diodes Incorporated], AP431Q Datasheet - Page 10

• Manufacturer Part Number: AP431Q
• Description: ADJUSTABLE PRECISION SHUNT REGULATOR
• Manufacturer: DIODES [Diodes Incorporated]

Application Examples
AP431/AP431A Rev. 5
V
IN
V
Fig. 7 Constant-Current
IN
LED on when Low Limit < V
Low Limit ≈ V
High Limit ≈ V
R1A
R2A
I
OUT
Fig. 4 Voltage
Sink
= V
Monitor
REF
REF
REF
(1+R1B/R2B)
(1+R1A/R2A)
/ R
R1B
S
R2B
I
OUT
R
IN
S
<
High Limit
V
IN
V
R1A
R2A
Fig.10 Over-Voltage / Under-Voltage Protection Circuit
IN
High Limit
Low Limit
Fig. 8 Higher-Current Shunt
R
R
1
2
V
Delay = RC x ln (
V
R1B
OFF
OUT
IN
= (1 + R1/R2) x V
www.diodes.com
V
V
Fig. 5 Delay
Regulator
REF
REF
R2B
R
O
N
10 of 14
Timer
(1 + R1A/R2A)
(1 + R1B/R2B) +V
ADJUSTABLE PRECISION SHUNT REGULATOR
+
V
IN
+
REF
V
-V
IN
REF
V
OUT
)
BE
V
V
IN
V
BE
IN
Low Limit <
Fig. 6 Current Limiter or Current
PULSE
Output ON when
R
R
1
2
V
L
I
IN
IMIT
OUT
AP431/AP431A
Fig. 9 Crow Bar
< High Limit
Source
= V
REF
(1 + R1/R2) x V
/ R
CL
R
CL
©
REF
I
V
OUT
Diodes Incorporated
OUT
MARCH 2007