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PDF MC3425 Data sheet ( Hoja de datos )
| Número de pieza | MC3425 | |
| Descripción | POWER SUPPLY SUPERVISORY/ OVER AND UNDERVOLTAGE PROTECTION CIRCUIT | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ON Semiconductort
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
VCC
VIR
IOS(DRV)
Value
40
–0.3 to +40
Internally
Limited
Unit
Vdc
Vdc
mA
Indicator Output Voltage
VIND
0 to 40
Vdc
Indicator Output Sink Current
IIND 30 mA
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air
PD
RθJA
1000
80
mW
°C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature Range
TA
0 to +70
°C
Storage Temperature Range
Tstg –55 to +150 °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
MC3425
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
6
U.V. IND
Output
5 U.V. DLY
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC3425P1 TA = 0° to +70°C
Plastic DIP
DC
Power
Supply
+
Cout
MC3425
Undervoltage
Indication
© Semiconductor Components Industries, LLC, 2001
April, 2001 – Rev. 3
1
Publication Order Number:
MC3425/D
1 page  
MC3425
APPLICATIONS INFORMATION
+VO Vin
R1A
+
Power
Supply
4.5V to 40V
-
R2A
R1B
8
VCC U.V. Fault
4 U.V.
U.V. 6 Indicator
Sense
IND
IH MC3425
3 O.V.
Sense
O.V. 1
DRV
O.V. U.V.
DLY Gnd DLY
R2B 2 7 5
CDLY
CDLY
Gnd
U.V. Hysteresis = IH
tDLY = 12500 CDLY
R1B R2B
R1B + R2B
, VO(trip) - 2.5 V
1+
R1A
R2A
AC Line
+5.0V
Power
VO = 5.0 V
VO(trip) = 6.25 V
Supply
8
15k VCC 1.0k
4 U.V.
Sense
U.V. 6
IND
MC3425
3 O.V.
Sense
O.V. 1
DRV
10k
100
O.V.
DLY Gnd
27
0.01µF
U.V.
DLY
5
0.33µF
Line Loss
Output
U.V. Sense
Pin 4
U.V. DLY
Pin 5
U.V. IND
Pin 6
2.5V
2.5V
OFF
ON
Figure 11. Overvoltage Protection and
Undervoltage Fault Indication with
Programmable Delay
Figure 12. Overvoltage Protection of 5.0 V
Supply with Line Loss Detector
+
12V
Power
Supply
+VO
8
12k
VCC
Alarm On when:
VO = 13.6 V
3 O.V.
Sense
O.V. 1
DRV
2.7k MC3425
4 U.V.
Sense
82k U.V. O.V.
DLY DLY Gnd
6.8k 5 2 7
100Ω
0.1µF
Gnd
Figure 13. Overvoltage Audio Alarm Circuit
Input Signal 5.0µF
I.V. p-p
10k
10k
12V
8
VCC
3 O.V.
Sense
O.V. 1
DRV
Output Pulse when:
f(input) <
1
25000 CDLY
MC3425
1.0k
4 U.V.
Sense
U.V.
DLY Gnd
O.V.
DLY
57 2
0.1µF
CDLY
O.V. Sense
Pin 3
O.V. DLY
Pin 2
O.V. DRV
Pin 1
2.5V
2.5V
ON
OFF
Figure 14. Programmable Frequency Switch
http://onsemi.com
5
5 Page 
Notes
MC3425
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MC3425.PDF ] | |
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