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TPS53318输入19V,输出5V,过一段时间后,自动掉电是怎么回事?

Other Parts Discussed in Thread: TPS53318

使用TPS53318电源芯片,输入19V,输出5V,运行一段时间(大概15Min左右)后就自动掉电。请问这是什么问题?附上原理图(参考的webench设计和TPS53318 datasheet)。