WT7522

Weltrend Semiconductor, Inc. WT7522 POWER SUPPLY PWM SUPERVISOR Data Sheet Version 1.10 April 29, 2009 The information in this document is subject to change without notice. ©Weltrend Semiconductor, Inc. All Rights Reserved. 24 2 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278. WT7522 Data Sheet Rev. 1.10 GENERAL DESCRIPTION The WT7522 is a pulse–width modulation (PWM) control circuit with complete protection circuits for used in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage Protection, Under Voltage Protection, Power Good Output (PG), Remote On/Off control, Opamp and etc. It can minimize external components of switching power supply systems in personal computer. Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage Protection (UVP) monitors 3.3V, 5V, 12V and one negative voltage input voltage level. Power Good Output monitors the voltage level of power supply. FEATURES Complete PWM Control and Protection Circuitry Over Voltage Protection for 3.3V / 5V / V12 / PT 3.3V / 5V / 12V Under Voltage Warning for PG Low Under Voltage Protection for 3.3V / 5V / V12 Two Opamp loop function 300ms PG Time Delay Power Good Output is Open Drain Output Push-pull PWM Output Remote ON/OFF function De–bounce Time Soft-Start function built-in 20–Pin Dual In–line Package PIN CONFIGURATION PSON V33 V5 PT DET NVP V1...