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FLYBUCK-FLYBACK-DESIGN-CALC: Ringing in Flyback Topoloy

Part Number: FLYBUCK-FLYBACK-DESIGN-CALC

Hi,

On the flyback topology (working in DCM), There are two types of ringing/ oscillations observed across the drain to source of switching FET.

Please see marked regions A and B. What is the root cause for these? From my understanding, an active/ passive clamping circuit can be used to remove A. What about B?