MC3423_05 Datasheet, PDF (1/10 Pages) ON Semiconductor – Overvoltage Crowbar Sensing Circuit

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
• Pb−Free Package is Available
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Differential Power Supply Voltage
V_CC−V_EE
40
Vdc
Sense Voltage (1)
V_Sense1
6.5
Vdc
Sense Voltage (2)
V_Sense2
6.5
Vdc
Remote Activation Input Voltage
V_act
7.0
Vdc
Output Current
I_O
300
mA
Operating Ambient Temperature Range
T_A
0 to +70
°C
Operating Junction Temperature
T_J
125
°C
Storage Temperature Range
T_stg −65 to +150 °C
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.
V_in
Current
Limited
DC
Power
Supply
V_out
+
C_out
O. V. P.
MC3423
Figure 1. Simplified Application
http://onsemi.com
8
1
MARKING
DIAGRAMS
PDIP−8
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
MC3423P1
AWL
YYWW
MC3423P1
A
WL
YY
WW
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
8
8
SOIC−8
D SUFFIX
3423
1 _{PLASTIC PACKAGE}
ALYW
CASE 751
1
3423
A
L
Y
W
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
V_CC 1
Sense 1 2
Sense 2 3
Current
Source
4
8
Drive
Output
7 V_EE
6
Indicator
Output
5
Remote
Activation
(Top View)
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