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插拔适配器,烧坏DCDC



现在的适配器电压为24V,使用降压DCDC  TPS54335DDA,实现24V降压为5V,TPS54335DDA的输入电压范围为4.5-28v;

在插拔适配器进行开关机实验的时候,发现2块板子的DCDC芯片被烧坏,输入端电源对地短路,输出端电源也对地短路。

电源部分的原理图如下,请帮忙分析一下原因,怎么改善,谢谢。