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求大神帮忙。。。。关于POE的问题!!!!!

Other Parts Discussed in Thread: TPS2376

小弟第一次接触POE,设计的是PD端额,PSE端拿了一个现成的POE交换机。  采用的是TPS2376+DC/DC的方案,现在测试现象是,PD端跟PSE连接后PES供电一瞬间然后断电,又供电 断电,一直持续供电  断电 供电 断电的过程,请教大神们,这是什么问题啊,电路采用的是datasheet里面的电路。