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!
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