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關於TI的UCC28600設計問題

Other Parts Discussed in Thread: UCC28600

要设计一个120W开关电源,输入是90-265V,电路用反激式,PFC的IC选择L6561,升压后Vo固定为为400V,PWM的IC 选择UCC28600,在设计主变压器的时候有个疑问:TI的资料里关于变压器的设计都是以90-265V交流整流后的输入电压来计算,而我这个前端还有PFC电路,此时主变压器设计的参数计算的Vin应该还是以90-265V来计算呢,还是要以400V来计算?请帮个忙,谢谢!