开关电源中WT7525_601WT7525SN1MGLF应用.pdf

偉詮電子股份有限公司偉詮電子股份有限公司 偉詮電子股份有限公司偉詮電子股份有限公司 Weltrend Semiconductor, Inc. WT7525-141 PC POWER SUPPLY SUPERVISOR Data Sheet REV. 1.04 January 17, 2012 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24號2樓 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 WT7525-141 Rev. 1.04 GENERAL DESCRIPTION The WT7525 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 / Under Voltage Detector (OVD / UVD) monitors V33, V5, V12A and V12B input voltage level. The Over Current Detector (OCD) monitor V33I33, V5I5, V12BI12AB and V12AI12AB input current sense. When OVD or UVD or OCD 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 3.5 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/Under Voltage Detector (OVD / UVD) monitors V33, V5, V12A and V12B input voltage. • The Over Current Detector (OCD) monitors V33I33, V5I5, V12BI12AB and V12AI12AB input current sense. • Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output. • 75ms / 300ms time delay for UVD and OCD. • 300ms time de