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UCC28180 PFC 動作異常問題

Other Parts Discussed in Thread: UCC28180EVM-573

請問我使用UCC28180EVM-573測試時,PFC輸出端接LLC,兩組個別測試均正常,但合在一起測試時PFC動作異常,當輸出大於60W時,PFC輸出電壓變成鋸齒波,工率因數降到0.7,輸入電流如附件圖,不知要如何改善?謝謝