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Hi,  I working on 48VV output, 60-200V input design based on UCC28951.  Target output current is about 90A.  My first attempt at this type of PSU design so excuse my lack of knowledge.

Following on from this thread: UCC28951 PSFB Controller - Sense Signal Filtering question

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 www.edaboard.com/threads/ucc28951-psfb-controller-sense-signal-filtering-question.401935/

Can you give me an example of the type of film/foil cap might be required, something like ECQ-E2106JF 10uf/250V ?

I've also been struggling a bit with the ringing across the output synchronous rectifier fets Qe and Qf at light loads and found there is a lot of power dissipation in the resistor of the RC snubber and RCD clamp when I tried that.  I think I need to use fets with lower capacitance, I currently have IPW60R041P6 which I think is a bad choice Coss 310pf, Co eff 1200pf.

Also

Sic Fets for the synchronous rectifier fets or the primary fets or both?  I looked at something like the NTHL025N065SC1, Coss is similar 278pf (maybe Coss eff is better, it's not quoted in the datasheet).

Thanks.