先在PCB板上烧坏了两片，检查Layout及原理图，没有找到问题，电源供应器限电流调节过高，都热击穿了，后来直接用新的焊Vin和GND，发现上电后就出现大电流，焊接过程注意了ESD的防护，目前最怀疑样品是不是混料了，芯片正面的Marks是"PFLI",背面的Mark“KAF”，是原装的吗？
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