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TPS54295: 工作时突然输出失电

Part Number: TPS54295

我采用TPS54295作为电源管理芯片,输入:5V,输出:3.3V和1.2V。现在遇到的问题是工作时tps54295的3.3V和1.2V有时会突然失电,失电后其输入5V还是正常的。而且要断电后重新上电,3.3V和1.2V才能恢复正常。想请教一下,什么原因可能导致这种情况?