SENSING CIRCUIT. MC3423 Datasheet

MC3423 CIRCUIT. Datasheet pdf. Equivalent

Part MC3423
Description OVERVOLTAGE SENSING CIRCUIT
Feature Order this document by MC3423/D MC3423 Overvoltage Crowbar Sensing Circuit This overvoltage protect.
Manufacture Motorola
Datasheet
Download MC3423 Datasheet



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.
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–VEE
VSense1
VSense2
Vact
IO
TA
TJ
Tstg
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
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



MC3423
MC3423
ELECTRICAL CHARACTERISTICS (5.0 V VCC – VEE 36 V, Tlow < TA , Thigh, unless otherwise noted.)
Characteristics
Symbol
Min
Typ
Supply Voltage Range
Output Voltage
(IO = 100 mA)
Indicator Output Voltage
(IO(Ind) = 1.6 mA)
Sense Trip Voltage
(TA = 25°C)
Temperature Coefficient of VSense1
(Figure 2)
VCC–VEE
VO
4.5
VCC–2.2
VCC–1.8
VOL(Ind)
0.1
VSense1,
VSense2
TCVS1
2.45
2.6
0.06
Remote Activation Input Current
(VIH = 2.0 V, VCC – VEE = 5.0 V)
(VIL = 0.8 V, VCC – VEE = 5.0 V)
Source Current
Output Current Risetime
(TA = 25°C)
Propagation Delay Time
(TA = 25°C)
Supply Current
NOTES: Tlow to Thigh = 0° to +70°C
IIH
IIL
ISource
tr
tpd
ID
0.1
5.0
–120
0.2
400
0.5
6.0
Max
40
0.4
2.75
40
–180
0.3
10
Figure 1. Representative Block Diagram
VCC 1
Unit
Vdc
Vdc
Vdc
Vdc
%/°C
µA
mA
mA/µs
µs
mA
2
Sense 1
+
Vref
2.6V
+
ISource
+
4 Current
Source
8
Output
7 VEE
3 Sense 2 5 6
Remote
Activation
Indicator
Output
Switch 1
(A)
(B)
VI
Switch 2
2
3
4
Figure 2. Sense Voltage Test Circuit
VCC
1
MC3423
8
75
V
VSense 1
VSense 2
Switch 1
Position A
Position B
Switch 2
Closed
Open
Ramp VI until output goes high; this is
the VSense threshold.
2 MOTOROLA ANALOG IC DEVICE DATA





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