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UCC28070一路工作正常一路异常

各位好,现在遇到一个比较棘手的问题,28070一路带载工作都正常,另外一路,带载之后PF值变低,测试电流波形发现,电流波形畸变比较严重,请各位帮忙分析一下可能的原因。