Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS431

Over Voltage/Under Voltage

Protection Circuit

Voltage Monitor

R1A

R2A

R1B

R2B

OUT ON

WHEN

LOW

LIMIT

LIMIT

V+

LOW LIMIT

≈ V

LOW LIMIT

≈ V

R1A

R2A

V+

R2B

R1B

LOW LIMIT

≈ V

LED ON WHEN

LOW LIMIT

≈ V

LOW LIMIT < V

Delay Timer

Current Limiter or Current Source

C

R

ON

OFF

V+

DELAY = R*C*

V+

R

CL

I

O

Constant Current Sink

V+

R

S

I

O