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UCC27211全桥逆变烧驱动芯片12管脚

 本人电源新手,初次使用UCC27211驱动芯片,搭建DC-AC逆变全桥电路,使用CSD19535功率MOS,在不通直流输入电压时驱动电路工作良好,波形正常,在通电后,电路短暂工作,之后烧毁电源驱动芯片,UCC27211驱动芯片的1脚和2脚被烧穿。请问这是什么原因?