Overvoltage Crowbar Sensing Circuit

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MC3423 pinout,MC3423 pin diagram
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 “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.
Features
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MARKING
DIAGRAMS
8
1
PDIP−8
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
AWL
YYWW
Pb−Free Package is Available
MC3423P1 = Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
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
V
CC
−V
EE
V
Sense1
V
Sense2
V
act
I
O
T
A
T
J
T
stg
Value
40
6.5
6.5
7.0
300
0 to +70
125
−65 to +150
Unit
Vdc
Vdc
Vdc
Vdc
mA
°C
°C
°C
8
1
8
SOIC−8
D SUFFIX
PLASTIC PACKAGE
CASE 751
3423
ALYW
1
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits
are exceeded, device functional operation is not implied, damage may occur
and reliability may be affected.
3423
A
L
Y
W
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
Drive
Output
V
EE
Indicator
Output
Remote
Activation
V
in
Current
Limited
DC
Power
Supply
+
C
out
V
out
V
CC
1
Sense 1 2
8
7
6
5
(Top View)
O. V. P.
MC3423
Sense 2 3
Current
4
Source
Figure 1. Simplified Application
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
©
Semiconductor Components Industries, LLC, 2005
1
March, 2005 − Rev. 5
Publication Order Number:
MC3423 D