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TPS92641 mos管发烫和芯片发烫设定的频率有跳动

Other Parts Discussed in Thread: TPS92641

我的tps92641设计开光频率为185kHz但有某个瞬间频率跳到1MHz,mos管和芯片也在发烫,我的输入电压是55V,输入电流为3A,电压为38V,如何解决MOS持续发热呢?