MC3425 Datasheet, PDF (1/12 Pages) ON Semiconductor – POWER SUPPLY SUPERVISORY/ OVER AND UNDERVOLTAGE PROTECTION CIRCUIT

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MC3425
Power Supply Supervisory/
Over and Undervoltage
Protection Circuit
The MC3425 is a power supply supervisory circuit containing all the
necessary functions required to monitor over and undervoltage fault
conditions. These integrated circuits contain dedicated over and
undervoltage sensing channels with independently programmable time
delays. The overvoltage channel has a high current Drive Output for use in
conjunction with an external SCR Crowbar for shutdown. The undervoltage
channel input comparator has hysteresis which is externally programmable,
and an open–collector output for fault indication.
• Dedicated Over and Undervoltage Sensing
• Programmable Hysteresis of Undervoltage Comparator
• Internal 2.5 V Reference
• 300 mA Overvoltage Drive Output
• 30 mA Undervoltage Indicator Output
• Programmable Time Delays
• 4.5 V to 40 V Operation
MAXIMUM RATINGS
Rating
Power Supply Voltage
Comparator Input Voltage Range (Note 1)
Drive Output Short Circuit Current
Symbol
Value
Unit
VCC
40
Vdc
VIR
–0.3 to +40 Vdc
IOS(DRV) Internally mA
Limited
Indicator Output Voltage
Indicator Output Sink Current
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
VIND
IIND
PD
R_θJA
TJ
TA
Tstg
0 to 40 Vdc
30
mA
1000
80
+150
0 to +70
–55 to +150
mW
°C/W
°C
°C
°C
NOTE: 1. The input signal voltage should not be allowed to go negative by more than 300 mV
NOTE: 1. or positive by more than 40 V, independent of VCC, without device destruction.
Simplified Application
Overvoltage Crowbar Protection, Undervoltage Indication
Vin
Vout
POWER SUPPLY SUPERVISORY/
OVER AND UNDERVOLTAGE
PROTECTION CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
8
1
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
O.V. DRV
Output
1
O.V. DLY 2
O.V. Sense 3
U.V. Sense 4
8 VCC
7 Gnd
U.V. IND
6 _Output
5 U.V. DLY
(Top View)
DC
Power
Supply
+
Cout
MC3425
MOTOROLA ANALOG IC DEVICE DATA
Undervoltage
Indication
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC3425P1 TA = 0° to +70°C Plastic DIP
© Motorola, Inc. 1996
Rev 2
1