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POE TPS2378 作为PD端,当有其他供电源时,POE交换机不供电,电路怎么设计?求赐教!

Other Parts Discussed in Thread: TPS54360, TPS2378

前端TPS2378,后端是TPS54360把电压转换成24V。

当有一个直流24V直接给PCB板供电时,POE交换机则不输出电压。

没有其他电源供电时,POE交换机输出电压。

求教电路怎么设计?

谢谢各位!