Capacitor selection for active clamp flyback

Thread Starter


Joined May 22, 2019
I am wondering what the best capacitor type for an active clamp flyback converter is for the clamp capacitor. My switching frequency is 300-500kHz, to be finalised.

I assume the best capacitors at this frequency range are ceramic capacitors.Since the capacitor also forms a resonant circuit with the transformer leakage inductance and magnetising inductance, I assume high stability COG capacitors would be best.
Is it best general practice to have a single capacitor as the clamp, or does a parallel capacitor bank tend to offer better suitability?

Possibly the best option is to have a PCB which has room for additional capacitors if they are required?