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请教TI工程师,UCC28600D驱动波形异常

在低压AC输入约90-120V时,满载约110W时,占空比大时,驱动波形出现大小波,并且只是一部分波形出现大小波,如图片,调高输入电压问题消失,变压器反射电压120V。电感量240uH.请问有什么对策?