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UCC28070带载PF低

Other Parts Discussed in Thread: UCC28070

2600W的PFC电路,采用UCC28070交错式PFC,电感133UH,频率100KHZ,输出电容1330UF,输入220V,输出390V,带500W负载的时候一切正常,带1000W负载时PF掉到0.5-0.7之间,电感电流波形杂乱,时有时无的,但是都没有达到3V的临界点。输出电压很正常,就是无法实现PFC。不知道有什么原因会导致这样的情况嗯