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Order this document by MC3423/D

MC3423

Overvoltage Crowbar

Sensing Circuit

This overvoltage protection circuit (OVP) protects sensitive electronic

circuitry from overvoltage transients or regulator failures when used in

conjunction with an external 鈥渃rowbar鈥?SCR. The device senses the

overvoltage condition and quickly 鈥渃rowbars鈥?or short circuits the supply,

forcing the supply into current limiting or opening the fuse or circuit breaker.

The protection voltage threshold is adjustable and the MC3423 can be

programmed for minimum duration of overvoltage condition before tripping,

thus supplying noise immunity.

The MC3423 is essentially a 鈥渢wo terminal鈥?system, therefore it can be

used with either positive or negative supplies.

OVERVOLTAGE

SENSING CIRCUIT

SEMICONDUCTOR

TECHNICAL DATA

P1 SUFFIX

PLASTIC PACKAGE

CASE 626

8

MAXIMUM RATINGS

Rating

Differential Power Supply Voltage

Sense Voltage (1)

Sense Voltage (2)

Remote Activation Input Voltage

Output Current

Operating Ambient Temperature Range

Operating Junction Temperature

Storage Temperature Range

Symbol

VCC鈥揤EE

VSense1

VSense2

Vact

IO

TA

TJ

Tstg

Value

40

6.5

6.5

7.0

300

0 to +70

125

鈥?5 to +150

Unit

Vdc

Vdc

Vdc

8

1

Vdc

mA

擄C

擄C

擄C

1

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SOP鈥?)

PIN CONNECTIONS

VCC 1

8

7

6

5

(Top View)

Drive

Output

VEE

Indicator

Output

Remote

Activation

Simplified Application

Sense 1 2

Sense 2 3

Current

4

Source

Vin

Current

Limited

DC

Power

Supply

+

Cout

Vout

O. V. P.

MC3423

ORDERING INFORMATION

Device

MC3423D

MC3423P1

Operating

Temperature Range

TA = 0擄 to +70擄C

Package

SO鈥?

Plastic DIP

Rev 1

漏

Motorola, Inc. 1996

MOTOROLA ANALOG IC DEVICE DATA

1

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