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Fabricante

AP432

ADJUSTABLE PRECISION SHUNT REGULATOR

Diodes Incorporated. 

Application Examples

AP432/AP432A

ADJUSTABLE PRECISION SHUNT REGULATOR

VIN

V IN

R1B

R1A

R

VIN

RCL I OUT

R2A

R2B

LED on when Low Limit< V < High Limit

Low Limit ≈ V

IN

(1+R1B/R2B)

High

Limit

≈

REF

V

(1+R1A/R2A)

REF

Fig. 4 Voltage

Monitor

V IN

I OUT

VIN

ON +

OFF

Delay = RC x ln ( V

VIN

-V

)

IN REF

Fig. 5 Delay

Timer

V OUT

R1

I

OUT

=

V

REF

/

RCL

Fig. 6 Current Limiter or Current

Source

VIN PUSE

R1

V OUT

RS

I OUT = VREF / RS

Fig. 7 Constant-Current

Sink

R2

V OUT = (1 + R1/R2) x VREF

Fig. 8 Higher-Current Shunt

Regulator

VIN

R1A

R1B

+

R2A

R2B

R2

LIMIT

(1 + R1/R2) x VREF

Fig. 9 Crow Bar

Output ON when

Low Limit <VIN < High Limit

VBE

Low Limit

High Limit

V

REF

(1 + R1B/R2B) +VBE

VREF (1 + R1A/R2A)

Fig.10 Over-Voltage / Under-Voltage Protection Circuit

AP432/AP432A Rev. 6

8 of 12

www.diodes.com

MARCH 2007

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