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UCC28070使用问题

Other Parts Discussed in Thread: UCC28070

各位TI的精英们,我最近使用UCC28070做3KWPFC,参照官网上的那个5KWPFC做的,现在诸多问题:1.负载带到1.5KW以上输入交流电流波形有尖刺;2.交流输入电流波形不对称;3.带负载瞬间会拉低输出电压,输出瞬间跌到200多伏。以上问题请了解这款芯片的大师给点指点,甚是感谢!