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TPS2378: TPS2378跟上端PSE供电协议问题

Part Number: TPS2378

TPS2378跟上端PSE供电协议问题:

1、TPS2378芯片模块焊接最小检测分级系统,在测试与上级PSE(MP3924)供电协议的时候,供电不正常,一直处于循环状态,请问这是什么原因造成的?