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用UCC28180设计了一个2000KW的PFC, 带点负载一切正常，空载时输出会达到500V, 设定值为400V. 什么原因？ 周边参数都是参考300W的评估板。电感是200uH空载时。频率180Khz.
用示波器看看输出，是一直保持再500V不降低还是说升高到500V又慢慢降低到400V又升高到500V？
