WT7520 データシートの表示（PDF） - Weltrend Semiconductor

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WT7520

PC Power Supply PWM Cupervisor

Weltrend Semiconductor 

3.REMOTE ON/OFF：

REM

REMONF

trem

REMON

toff

SS

WT7520

Data Sheet Rev. 0.90

trem

toff

4. Under Voltage Protection Delay Time：

REM

REMON

UVP

td,uvp

5. Pulse Width Modulation Block：

The output pulse width modulation is generated by comparision of the saw–tooth waveform

from the capacitor CT to the feedback of the voltage.

Therefore, an increase in feedback control signal amplitude cause a linear decrease of the

output pulse width. Also, the SS(DTC and Soft-Start) limits the output pulse width. The timing

diagram is shown as below:

CT

DTC

FF-CLK

FF-Q

FF-QN

C1

C2

PWM OUT

Weltrend Semiconductor, Inc.

Page 7

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