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

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

Johnsin Tao：

HI频率是你自己设置的，然后用这个频率来算变压器等，一旦这些参数定了，工作频率也就定下来了。www.ti.com.cn/…/zhcu017.pdf