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LMR33630: 按照规格书做了LMR33630测试板,上电后芯片损坏

Part Number: LMR33630

我先后使用LMR33620CDDA LMR33630ADDA芯片做了试验板,在试验过程中损坏了几片芯片,请大家帮忙分析一下是什么原因。谢谢。

具体现象为上电后(24V,电流限制0.6A),电源直接工作在CC模式,供电电压被拉到3V。

断电后测量VIN和SW直通, 也有的VIN和SW与GND直通,电阻几乎为0。

原理图如图: