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How to selection UCC28810 oscillation frequency selection and tranformer calculation in PMP5112

Xiaobing (Eric)
Prodigy 100 points
Other Parts Discussed in Thread: UCC28810

Hi All,

 I would like to design a buck Flyback converter by UCC28810, the input/utput condition are:

 Vin:96Vac to 264Vac, 

 Vo: 220Vdc, 0.5A (100W), isolation is required. 

 Can I have to know how about work frequency for UCC28810 in PMP5112 application? How to know more details for  Transformer calculation? Thank you. 

Regards,

Eric