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poe芯片-TPS23752PWP,无法被路由检测!

Other Parts Discussed in Thread: TPS23752

直接用直流53V给tps23752工供电,可以正常输出12v,但是用poe路由供电就是无输出(量rj45,12,36脚之间无电压)!,请问大神给点思路!原理图如附件!

SWH1088-V2-161128.pdf