MC3425P1 ON Semiconductor, MC3425P1 Datasheet

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MC3425P1

Manufacturer Part Number
MC3425P1
Description
Manufacturer
ON Semiconductor
Datasheet

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Power Supply Supervisory/
Over and Undervoltage
Protection Circuit
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.
MAXIMUM RATINGS
NOTE: 1. The input signal voltage should not be allowed to go negative by more than 300 mV
NOTE: 1.
MOTOROLA ANALOG IC DEVICE DATA
Power Supply Voltage
Comparator Input Voltage Range (Note 1)
Drive Output Short Circuit Current
Indicator Output Voltage
Indicator Output Sink Current
Power Dissipation and Thermal Characteristics
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
The MC3425 is a power supply supervisory circuit containing all the
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
V in
Maximum Power Dissipation @ T A = 70 C
Thermal Resistance, Junction–to–Air
or positive by more than 40 V, independent of V CC , without device destruction.
Overvoltage Crowbar Protection, Undervoltage Indication
Supply
Power
DC
Rating
C out
Simplified Application
+
MC3425
I OS(DRV)
Symbol
V IND
R JA
V CC
I IND
T stg
V IR
P D
T J
T A
–55 to +150
–0.3 to +40
Internally
0 to +70
Limited
0 to 40
Value
1000
+150
40
30
80
Undervoltage
Indication
V out
Unit
Vdc
Vdc
Vdc
mW
mA
mA
C/W
C
C
C
POWER SUPPLY SUPERVISORY/
MC3425P1
Motorola, Inc. 1996
Device
OVER AND UNDERVOLTAGE
O.V. Sense
U.V. Sense
O.V. DRV
O.V. DLY
PROTECTION CIRCUIT
Output
ORDERING INFORMATION
PIN CONNECTIONS
SEMICONDUCTOR
Temperature Range
MC3425
TECHNICAL DATA
PLASTIC PACKAGE
Order this document by MC3425/D
1
2
3
4
T A = 0 to +70 C
8
Operating
P1 SUFFIX
CASE 626
(Top View)
1
8
7
6
5
V CC
Gnd
U.V. IND
Output
U.V. DLY
Plastic DIP
Package
Rev 2
1

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MC3425P1 Summary of contents

Page 1

... T J +150 + stg –55 to +150 C O.V. Sense U.V. Sense V out MC3425 Undervoltage Indication Device MC3425P1 Motorola, Inc. 1996 Order this document by MC3425/D MC3425 PROTECTION CIRCUIT SEMICONDUCTOR TECHNICAL DATA SUFFIX PLASTIC PACKAGE CASE 626 PIN CONNECTIONS O.V. DRV Output O ...

Page 2

ELECTRICAL CHARACTERISTICS (4.5 V Characteristics REFERENCE SECTION Sense Trip Voltage (Referenced Voltage low to T high (Note 2) Line Regulation of V Sense 4 ...

Page 3

Figure 1. Hysteresis Current versus Hysteresis Activation Voltage 5 0.2 0.4 0.6 ...

Page 4

Figure 7. Drive Output Saturation Voltage versus Output Peak Current 5 4.0 1.0% Duty Cycle @ 300 3.0 2.0 1 100 200 I DRV(peak) , DRIVE OUTPUT ...

Page 5

Figure 11. Overvoltage Protection and Undervoltage Fault Indication with Programmable Delay R1A R1B U.V. Fault Power Indicator Supply 4 6 U.V. U.V. 4.5V to 40V Sense IND – MC3425 1 3 O.V. O.V. Sense ...

Page 6

The MC3425 is a power supply supervisory circuit containing all the necessary functions required to monitor over and undervoltage fault conditions. The block diagram is shown below in Figure 15. The Overvoltage (O.V.) and Undervoltage (U.V.) Input Comparators are both ...

Page 7

Referring to Figure 16, it can be seen that the crowbar SCR, when activated, is subject to a large current surge from the output capacitance, C out . This capacitance consists of the power supply output capacitors, the load’s decoupling ...

Page 8

Figure 17. Crowbar SCR Surge Current Waveform Surge Due to Output Capacitor Current Limited Supply Output 2. Surge Current If the peak current and/or the duration of the surge is excessive, immediate destruction due to ...

Page 9

F –A– NOTE 2 C –T– N SEATING PLANE 0.13 (0.005) M MOTOROLA ANALOG IC DEVICE DATA MC3425 OUTLINE DIMENSIONS P1 SUFFIX PLASTIC PACKAGE CASE 626–05 ISSUE ...

Page 10

MC3425 NOTES MOTOROLA ANALOG IC DEVICE DATA ...

Page 11

MOTOROLA ANALOG IC DEVICE DATA MC3425 NOTES 11 ...

Page 12

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of ...

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