Weltrend Semiconductor, Inc.
WT7527
PC POWER SUPPLY SUPERVISOR
Data Sheet
Version 1.20
June 22, 2007
The information in this document is subject to change without notice.Weltrend Semiconductor, Inc. All Rights Reserved.
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2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
WT7527
Rev. 1.20
GENERAL DESCRIPTION
The WT7527 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 VX, V33, V5, V12A and V12B input voltage level. The Under Voltage Detector (UVD) monitors V33, V5, V12A and V12B input voltage level. The Over Current Detector (OCD) monitor I33&V33, I5&V5, I12A&V12A and I12B&V12B input current sense. The pin VX provides an extra protection function. When OVD or UVD or OCD or VX detect the fault voltage level, the FPOB is latched HIGH and PGO go low. The latch can be reset by PSONB go HIGH. There is 4 ms delay time for PSONB turn off FPOB.
When OVD and UVD and OCD detect the right voltage level, the power good output (PGO) will be issue.
FEATURES
•The Over Voltage Detector (OVD) monitors VX, V33, V5, V12A and V12B input voltage.
•The Under Voltage Detector (UVD) monitors V33, V5, V12A and V12B input voltage.
•The Over Current Detector (OCD) monitors I33&33, I5&V5, I12A&V12A and I12B&V12B input pins.
•The VX > 1.2V provide an extra protection.
•Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
•75 / 600 ms time delay for UVD / OCD / VX .
•300 ms time delay for PGO.
•38 ms for PSONB input signal De–bounce.
•14 us for OVD internal signal De–glitch.
•60 us for UVD / VX internal signal De–glitch.
•20 ms for OCD internal signal De–glitch.
•73 us for PGI internal signal De–glitch.
•4 ms for PSONB turn-off FPOB.
PIN ASSIGNMENT AND PACKAGE TYPE
Pin assignment
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PGI |
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1 |
16 |
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PGO |
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GND |
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2 |
15 |
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VCC |
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FPOB |
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3 |
14 |
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V5 |
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PSONB |
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4 |
13 |
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V33 |
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I12A |
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5 |
12 |
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V12A |
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RI |
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6 |
11 |
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I33 |
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I12B |
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7 |
10 |
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I5 |
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V12B |
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8 |
9 |
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VX |
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Weltrend Semiconductor, Inc.
Page 2
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WT7527 |
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Rev. 1.20 |
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ORDERING INFORMATION |
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Part Number |
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Package Type |
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Note |
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WT7527–NN160–1D |
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16-Pin Plastic DIP, Pb-free |
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WT7527–NN161–1D |
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WT7527–SN160–1D |
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16-Pin Plastic SOP, Pb-free |
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WT7527–SN161–1D |
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PIN DESCRIPTION |
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Pin Name |
I/O |
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Description |
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PGI |
I |
Power good input signal pin |
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GND |
P |
Ground |
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FPOB |
O |
Fault protection output pin, open drain output |
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PSONB |
I |
On/Off switch input |
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I12A |
I |
12VA over current protection sense input |
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RI |
I |
Current sense adjust input |
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I12B |
I |
12VB over current protection sense input |
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V12B |
I |
12VB over voltage & under voltage & over current sense input |
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pin |
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VX |
I |
Extra protection sense input |
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I5 |
I |
5V over current protection sense input |
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I33 |
I |
3.3V over current protection sense input |
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V12A |
I |
12VA over voltage & under voltage & over current sense input |
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pin |
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V33 |
I |
3.3V over voltage & under voltage & over current sense input pin |
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V5 |
I |
5V over voltage & under voltage & over current sense input pin |
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VCC |
I |
Power supply |
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PGO |
O |
Power good output signal pin, open drain output |
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Weltrend Semiconductor, Inc.
Page 3
WT7527
Rev. 1.20
BLOCK DIAGRAM
WT7527-160 |
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VCC |
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PWR |
Power On Reset |
PWR |
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VCCI |
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38ms |
4ms |
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PSONB |
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debounce |
clr |
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1.2V ~ 1.8V |
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delay |
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Bandgap |
VREF = 1.2V |
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75ms / 600ms |
Reference |
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clr |
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delay |
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VREF = 1.2V |
-UN |
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V33 |
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+ |
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Internal |
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VCCI = 3.6V |
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Power |
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-OV |
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+ |
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V5 |
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-UN |
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+ |
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PWR |
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-OV |
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+ |
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-UN |
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OSC |
CLK |
V12A |
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+ |
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-OV |
clr |
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+ |
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60us |
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V12B |
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-UN |
debounce |
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+ |
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-OV |
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+ |
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clr |
R |
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FPOB |
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14us |
S |
Q |
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debounce |
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VX |
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-OV |
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+ |
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clr |
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PGO |
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- |
73us |
300ms |
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clr |
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PGI |
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+ |
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debounce |
delay |
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V12A |
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- |
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I33 |
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+ |
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V12A |
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IREF * 8 |
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V12A |
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V12A |
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VREF = 1.2V |
+ |
IREF=VREF / RI |
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- |
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- |
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RI |
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I5 |
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+ |
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IREF * 8 |
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V12A |
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- |
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I12A |
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+ |
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IREF * 8 |
clr |
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V12A |
20ms |
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debounce |
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- |
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I12B |
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+ |
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IREF * 8 |
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Weltrend Semiconductor, Inc.
Page 4
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