WT7520

www.DataSheet4U.com °¶¸à¹q¤lªÑ¥÷¦³--¤½¥q Weltrend Semiconductor, Inc. WT7520 PC POWER SUPPLY PWM SUPERVISOR Data Sheet REV. 0.9 February 21, 2005 The information in this document is subject to change without notice. © Weltrend Semiconductor, Inc. All Rights Reserved. ·s¦Ë¥«¬ì¾Ç¤u·~¶é°Ï¤u·~ªF¤E¸ô 24 ¸¹ 2¼Ó 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:[email protected] www.DataSheet4U.com WT7520 Data Sheet Rev. 0.90 GENERAL DESCRIPTION The WT7520 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 (PGO), Remote On/Off control 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 and 12V 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 / 12V / PT Under Voltage Protection for 3.3V / 5V / 12V 280ms PG Time Delay Power Good Output is Open Drain Output PWM Control Output are Open Drain Output 280 mS Time Delay for UVP Remote ON/OFF function De–bounce Time Soft-Start function ...