WT7520 PDF Datasheet – PC Power Supply PWM Supervisor

Part Number: WT7520

Function: PC Power Supply PWM Supervisor

Package: DIP 16 Pin Type

Manufacturer: Weltrend Semiconductor


2 page


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.


1. Complete PWM Control and Protection Circuitry

2. Over Voltage Protection for 3.3V / 5V / 12V / PT

3. Under Voltage Protection for 3.3V / 5V / 12V

4. 280ms PG Time Delay

5. Power Good Output is Open Drain Output

6. PWM Control Output are Open Drain Output

7. 280 mS Time Delay for UVP

8. Remote ON/OFF function De–bounce Time

9. Soft-Start function built-in



Absolute Maximum Ratings :

1. Supply voltage : VCC 5.5 V

2. Drain output voltage : Vcc1, Vcc2 5.5 V

3. Drain output current : Icc1, Icc2 200 mA

4. Power dissipation : Pd 200 mW

5. Operating temperature : Topr -10 ~ +70 ℃

6. Storage temperature: Tstg -65 ~ +150 ℃


Other data sheets are available within the file: WT7905, WT-7520

WT7520 Datasheet