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LMR33630ADDAEVM: 芯片输出电流达不到3A,且输出对地短路时会烧毁

Part Number: LMR33630ADDAEVM

请教各位专家一个问题,为什么我的设计输出电流在2A左右时芯片会烧毁,并不会出现文档中描述的hiccup mode,附原理图。另外,如何防止+5.2位置对地短路时芯片烧毁这一问题