MC3423 Datasheet, PDF (1/8 Pages) ON Semiconductor – OVERVOLTAGE SENSING CIRCUIT

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 “crowbar” SCR. The device senses the
overvoltage condition and quickly “crowbars” 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 “two terminal” system, therefore it can be
used with either positive or negative supplies.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Differential Power Supply Voltage
VCC–VEE
40
Vdc
Sense Voltage (1)
VSense1
6.5
Vdc
Sense Voltage (2)
VSense2
6.5
Vdc
Remote Activation Input Voltage
Vact
7.0
Vdc
Output Current
IO
300
mA
Operating Ambient Temperature Range
TA
0 to +70
°C
Operating Junction Temperature
TJ
125
°C
Storage Temperature Range
Tstg
–65 to +150
°C
Order this document by MC3423/D
MC3423
OVERVOLTAGE
SENSING CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
8
1
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)
PIN CONNECTIONS
Simplified Application
Vin
Current
Limited
DC
Power
Supply
+
Cout
O. V. P.
MC3423
MOTOROLA ANALOG IC DEVICE DATA
VCC 1
8
Drive
Output
Sense 1 2
7 VEE
Sense 2 3
6
Indicator
Output
Vout
Current
Source
4
5
Remote
Activation
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC3423D
MC3423P1
TA = 0° to +70°C
SO–8
Plastic DIP
© Motorola, Inc. 1996
Rev 1
1