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UCC28019功率因数太低

Other Parts Discussed in Thread: UCC28019

使用功率因数校正芯片UCC28019,功率因数只有百分之七十多,随着负载增加稍微升一点点,但是没有达到百分之八十,我看别人的文档都可以达到百分之八十多,请问是什么原因,与布局有很大的关系吗?谢谢了