Maker : Weltrend
Part No. : WT7520

  Datasheet PDF : WT7520.pdf
  Cross Reference : WT7520 Cross Reference
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Product Information

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 2¼Ó ¸¹ 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 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 built-in 16–Pin Dual In–line Package PIN CONFIGURATION 7520 V33 V5 V12 PT GND RT C1 C2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VADJ OPNEGIN OPOUT VCC DET PG SS REM Ordering Number WT7520 Package Type DIP 16 Weltrend Semiconductor, Inc. Page 2 www.DataSheet4U.com WT7520 Data Sheet Rev. 0.90 PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9 Pin Name V33 V5 V12 PT GND RT C1 C2 REM TYPE I I I I P O O O I FUNCTION OVP/UVP input FOR 3.3V. OVP/UVP input for 5V. OVP/UVP input for 12V. Extra OVP protection input. Ground. Oscillation frequency set by external resistor. PWM open drain output 1. PWM open drain output 2. Remote on/off input. REM=”low” that means the main SMPS is turned-on. REM=”high”, the main SMPS is turned-off. Soft start function set by external capacitor. Power good signal. PG= ”high” means “power good”. PG= ”low” means “power fail”. Extra protection input. Supply voltage. OP compensation output. OP compensation negative input. OP compensation positive input , feedback voltage sense input. 10 11 SS PG O O 12 13 14 15 16 DET VCC OPOUT OPNEGIN VADJ I P O I I *The difference between WT7905 and WT7520 ITEM WT7905 Pin-6 CT; external capacitor (PWM frequency) Pin-10 TPG; external capacitor (PG delay-time function) OVP-3.3V,5V,12V 100us (Typ.) UVP-3.3V,5V,12V 100us (Typ.) Soft-Start function Set by internal circuit Pin-4 (PT) PT default 0.8V (with internal voltage divided resistors) WT7520 RT; external resistor (ex. 120k£[ ) SS; external capacitor (Soft-start function) 510us (Typ.) 110us (Typ.) Set by external capacitor (Pin-10:SS) PT default 0.8V. (with internal voltage divided resistors) (24K+4.6K) Weltrend Semiconductor, Inc. Page 3 www.DataSheet4U.com WT7520 Data Sheet Rev. 0.90 BLOCK DIAGRAM [1] V33 - UV + [2] V5 - UV + [3] V12 - UV + UVP 110us 280ms delay IN OUT CLR 510us S Q -OV + OVP -OV + R -OV + -OV + [4] PT 0.62V + QOUT 280ms delay IN OUT 5K [11] PG [9] REM 36mS Delay 4.5mS Delay REMONF Vss REMON SS [10] [12] DET 0.62V + OSC [6] RT ERROR AMP [16] [15] VADJ OPNEGIN 2.45V + CLR C1 PWM CONTROL PWMCMP D Q [7] + - C QN C2 [8] + [14] OPOUT - DETCMP SOFT_START CONTROLLER ABSOLUTE MAXIMUM RAT INGS, VCC=5.5V CHARACTERISTICS Supply voltage Drain output voltage Drain output current Power dissipation Operating temperature Storage temperature SYMBOL VCC Vcc1, Vcc2 Icc1, Icc2 Pd Topr Tstg VALUE 5.5 5.5 200 200 -10 ~ +7...

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