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UCC28070 应用只炸1相或2相PFC的mosfet,其他都没坏,有什么可能原因?

Other Parts Discussed in Thread: UCC28070

UCC28070 应用只炸1相或2相PFC的mosfet,其他都没坏,有什么可能原因?

公司内部测试还可以,