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TPS23753A: Problem with pwering up PoE PD circuit

Part Number: TPS23753A

Hello,

I am using the TPS23753A PD controller for my PD circuit, which is PoE type 1 class 1.

When applying a voltage of 48V and a current around 300mA at PWRSPARE1 and PWRSPARE2 nothing happens.

Could you please advise?

Thank you!

Amina