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交错式单级PFC UCC28061方案

Other Parts Discussed in Thread: UCC28061

我现在用UCC28061做的交错式单级PFC电路,前面是抄得TI的设计范例,我做了160W,后面恒流用的是DC-DC恒流,现在PFC下降很严重,低压可以勉强做到0.9以上,输入电压高于150V时,PFC就感觉不正常了,谁能帮我分析下是什么原因呢,先谢谢了