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TPS2378 非隔离PD,外壳接地导致问题(兼容性)

Other Parts Discussed in Thread: LM5085, TPS2378

我们用TPS2378 和LM5085 设计一款非隔离PD,电路如附件: TPS2378&LM5085&RJ45.PDF.  样机PCBA如附件:sample.jpeg。

其中TVS (58V)D6,D7 连接外壳地(安装孔,RJ45屏蔽罩直接连接外壳地)。

当POE 交换机(博达  S2108POE,华为S2700 交换机)外壳接地,样机也外壳接地时,PD不上电。

断开样机PCBA 外壳地,供电正常。

请帮忙分析原因,谢谢!

TPS2378&LM5085&RJ45.pdf