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TPS23753A: TPS23753AEVM——001

Part Number: TPS23753A

参考的是TI的TPS23753AEVM-001 48V转5V设计,接外部电源48V时,能够正常输出;但是连接POE时,PSE端检测不到PD端,POE输入端0.5V,以下是原理图: