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PMP22477: Using diode vs FETs in rectifying center tap

Part Number: PMP22477

Tool/software:

Hello team,

I am implemementing POE functionality on a board. We are basing the design off of PMP22477and want to know the reasoning behind using FETs/ FET-diodes over diodes in a 50W application. Is it due to efficiency or are there other reasons for it to be "Almost neccessary" to be used?

PoE PD Schematic Review Guidelines