MC3423 ON Semiconductor, MC3423 Datasheet

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MC3423

Manufacturer Part Number
MC3423
Description
Manufacturer
ON Semiconductor
Datasheet

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MC3423
Overvoltage Crowbar
Sensing Circuit
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.
be programmed for minimum duration of overvoltage condition
before tripping, thus supplying noise immunity.
can be used with either positive or negative supplies.
Features
March, 2005 − Rev. 5
MAXIMUM RATINGS
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.
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
V
This overvoltage protection circuit (OVP) protects sensitive
The protection voltage threshold is adjustable and the MC3423 can
The MC3423 is essentially a “two terminal” system, therefore it
Pb−Free Package is Available
in
Semiconductor Components Industries, LLC, 2005
Current
Limited
Supply
Power
DC
Rating
Figure 1. Simplified Application
C
out
+
MC3423
V
O. V. P.
Symbol
V
V
CC
Sense1
Sense2
V
T
T
T
I
−V
act
stg
O
A
J
EE
−65 to +150
0 to +70
Value
300
125
6.5
6.5
7.0
40
1
Unit
Vdc
Vdc
Vdc
Vdc
mA
C
C
C
V
out
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
8
8
1
Sense 1
Sense 2
1
Current
Source
ORDERING INFORMATION
MC3423P1 = Device Code
A
WL
YY
WW
V
CC
PLASTIC PACKAGE
PLASTIC PACKAGE
3423
A
L
Y
W
PIN CONNECTIONS
http://onsemi.com
1
2
3
4
P1 SUFFIX
CASE 626
CASE 751
D SUFFIX
SOIC−8
PDIP−8
= Device Code
(Top View)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Assembly Location
= Wafer Lot
= Year
= Work Week
Publication Order Number:
8
7
6
5
DIAGRAMS
8
1
MARKING
Drive
Output
V
Indicator
Output
Remote
Activation
MC3423P1
EE
ALYW
MC3423/D
3423
YYWW
AWL

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MC3423 Summary of contents

Page 1

... 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 ...

Page 2

... Propagation Delay Time ( Supply Current NOTES +70 C low high 2 Sense 1 V ref 2.6V − Switch 1 2 (A) 3 MC3423 (B) Switch MC3423 V − < low A high Symbol V − (Ind Sense1, V Sense2 TCV ...

Page 3

... C V trip Figure 6. Basic Configuration for Programmable Duration of Overvoltage Condition Before Trip MC3423 + Load G S1* (− Sense Lead) − Sense Lead MC3423 * (− Sense Lead) − trip + ref 0 ...

Page 4

... TC for the trip voltage value. Configuration for Programmable Minimum Duration of Overvoltage Condition Before Tripping In many instances, the MC3423 OVP will be used in a noise environment. To prevent false tripping of the OVP circuit by noise which would not normally harm the load, MC3423 has a programmable delay feature ...

Page 5

... Supply #2 7 Figure 8. Circuit Configuration for Activating One MC3423 from Another Note that both supplies have their negative output leads tied together (i.e., both are positive supplies). If their positive leads are common (two negative supplies) the emitter of Q1 would be moved to the positive lead of supply 1 and R1 would therefore have to be resized to deliver the appropriate drive to Q1 ...

Page 6

... Of course, a sufficiently high surge will cause an open. These comments also apply to the fuse in Figure 11B. The value of di/dt that an SCR can safely handle is influenced by its construction and the characteristics of the MC3423 (11A) gate drive signal. A center−gate−fire SCR has more di/dt V out capability than a corner− ...

Page 7

... Operating Temperature Range MC3423D MC3423DG MC3423DR2 +70 C MC3423DR2G A MC3423P1 MC3423P1G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. MC3423 Package SOIC−8 SOIC−8 (Pb−Free) SOIC−8 SOIC− ...

Page 8

... F −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M MC3423 PACKAGE DIMENSIONS PDIP−8 P1 SUFFIX CASE 626−05 ISSUE http://onsemi.com 8 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS) ...

Page 9

... PLANE −Z− 0.25 (0.010 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. MC3423 SOIC−8 D SUFFIX CASE 751−07 ISSUE 0.10 (0.004) M ...

Page 10

... USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 10 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. MC3423/D ...

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