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TPS92513HV 容易烧毁的问题

Other Parts Discussed in Thread: TPS92513HV

最近我设计了一个TPS92513HV的电路,但是出现一个问题,就是容易烧毁。

电路图如下

PCB如下,背面全部为接地覆铜

烧毁现象,上电烧毁/输出短路烧毁/插入负载烧毁。

后来加了个二极管改成如下 接入负载不那么容易烧毁了。但是还是会烧毁

 

我负载是150mA 3V白灯15个一串总共6串 就是1A

希望能有高人指点,谢谢