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ucc28019功率因数校正输入电流波形到峰值总是这种问题（换了几个电感波形到峰值就降为零又升上来又将为零），电路与数据手册基本一样的，只有采样电阻有变化，小负载带不动，我应该怎么去改？在线等
电流波形异常，请把原理图发出来先分析，谢谢。
