SUPPLY SUPERVISOR. WT7502V Datasheet

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WT7502V Datasheet
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Part WT7502V
Description PC POWER SUPPLY SUPERVISOR
Feature WT7502V; Weltrend Semiconductor, Inc. ` WT7502V PC POWER SUPPLY SUPERVISOR Data Sheet REV. 1.01 November 30,.
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Weltrend Semiconductor WT7502V
偉詮電子股份有限公司
Weltrend Semiconductor, Inc.
`
WT7502V
PC POWER SUPPLY SUPERVISOR
Data Sheet
REV. 1.01
November 30, 2010
The information in this document is subject to change without notice.
©Weltrend Semiconductor, Inc. All Rights Reserved.
新竹市科學工業園區工業東九路242
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419



Weltrend Semiconductor WT7502V
WT7502V
Rev. 1.01
GENERAL DESCRIPTION
The WT7502V provides protection circuits, power good output (PGO), fault protection latch (FPOB),
and a protection detector function (PSONB) control. It can minimize external components of switching
power supply systems in personal computer.
The Over Voltage Detector (OVD) monitors V33, V5 and VCC input voltage level. The Under Voltage
Detector (UVD) monitors V33, V5 and VCC input voltage level. When OVD or UVD detect the fault
voltage level, the FPOB is latched HIGH and PGO go low. When PGI detect the fault voltage level, the
FPOB would be kept LOW and PGO go low. The latch can be reset by PSONB go HIGH. There is 2.4
ms delay time for PSONB turn off FPOB.
When PGI and OVD and UVD detect the right voltage level, the power good output (PGO) will be
issue.
FEATURES
The Over Voltage Detector (OVD) monitors V33, V5 and VCC input voltage.
The Under Voltage Detector (UVD) monitors V33, V5 and VCC input voltage.
Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
75 ms time delay for UVD.
300 ms time delay for PGO.
38 ms for PSONB input signal De–bounce.
73 us for PGI and UVD internal signal De–glitches.
55 us for OVD internal signal De–glitches.
2.4 ms time delay for PSONB turn-off FPOB.
The UVD would been disabled when PGI < 0.95V.
PIN ASSIGNMENT AND PACKAGE TYPE
ORDERING INFORMATION
PACKAGE
8–Pin Plastic DIP
Green
WT7502V–NG084
8–Pin Plastic SOP
WT7502V–SG084
Weltrend Semiconductor, Inc.
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Weltrend Semiconductor WT7502V
PIN DESCRIPTION
Pin Name TYPE
PGI I
GND
P
FPOB
O
PSONB
I
V33 I
V5 I
VCC
I
PGO
O
Description
Power good input signal pin
Ground
Fault protection output pin, open drain output
On/Off switch input
3.3V over voltage & under voltage
5V over voltage & under voltage
Power supply
Power good output signal pin, open drain output
WT7502V
Rev. 1.01
FUNCTION TABLE
PGI
< 0.95V
< 0.95V
< 0.95V
0.95V < PGI < 1.2V
0.95V < PGI < 1.2V
0.95V < PGI < 1.2V
PGI > 1.2
PGI > 1.2
PGI > 1.2
X
X = don’t care
PSONB
L
L
L
L
L
L
L
L
L
H
UVD
No
No
Yes
No
No
Yes
No
No
Yes
X
OVD
No
Yes
No
No
Yes
No
No
Yes
No
X
FPOB
L
H
L
L
H
H
L
H
H
H
PGO
L
L
L
L
L
L
H
L
L
L
Weltrend Semiconductor, Inc.
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