AP431IAL datasheet(9/17 Pages) ANACHIP

9 / 17 page

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

9/17

Application Examples

VIN

Low Limit

VREF(1 + R1B/R2B) +VBE

High Limit

VREF(1 + R1A/R2A)

R1A

R1B

R2A

R2B

VBE

Output ON when

Low Limint < VIN<High Limit

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

VIN

RCL

IOUT

IOUT = VREF / RCL

Fig.6 Current Limiter or Current Source

IOUT

VIN

IOUT = VREF / RS

Fig.7 Constant-Current Sink

Fig.4 Voltage Monitor

Fig.5 Delay Timer

VOUT = (1 + R1/R2) x VREF

VIN

Fig.8 Higher-Current Shunt Regulator

VOUT

VIN

PUSE

LIMIT

(1 + R1/R2) x VREF

Fig.9 Crow Bar

VOUT

VIN

OFF

Delay = RC x ln(

IN -VREF

)

LED on when Low Limit＜VIN＜High Limit

Low Limit ≈ VREF (1+R1B/R2B)

High Limit ≈ VREF (1+R1A/R2A)

R1A

R2A

VIN

R1B

R2B

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