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AN4105

Design Considerations for Switched Mode Power Supplies Using A Fairchild Power Switch (FPS) in a Flyback Converter

Fairchild Semiconductor 

AN4105

PW M

IC

Cu rre n t

S e n sin g

APPLICATION NOTE

Rg

Rf

MO S FE T

Cf

Rs

(a<) N o ise elim inat ion u sing R C f ilter >

Ifb

V fb

Cfb

V ck

OSC

Vi

LEB

Va

Vb

V is

S

Vq

Q

R

Vo

Ifb

Fe e d ba ck

Cir cu it

(<b) In te rn al blo ck d iag ra m f or no ise elim inat ion u sing L E B >

Vck

Va

0

V fb

V is

0

Vb

0

Vq

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(c) Noise elimination and waveforms in LEB

< Noise elim ination and waneform s in LE B >

Figure 14. Leading edge blanking.

12

©2002 Fairchild Semiconductor Corporation

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