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Original question:

TPS2373: Does TPS23861 Support UPOE standard?

TPS2373: Function of TPS2373 switch

David ke
Intellectual 310 points
Part Number: TPS2373

Dear sir:

I have a problem,When the PSE shakes hands with TPS2373 successfully, does TPS2373 turn on a switch to let VSS (4,5,21) and RTN (11,12)

  • 0
    TI__Mastermind 41790 points

    Hi David,

    After negotiation, the PSE will turn ON to nominal PoE voltage (52-57V). During this voltage ramp up, then the voltage goes above the UVLO threshold of the TPS2373 (~38V), the internal pass FET will slowly turn ON. I say slowly because it will turn ON to a inrush current limit to charge bulk cap meaning the voltage between VDD-RTN will ramp up depending on the bulk cap (C28). Figure 17 of the datasheet shows the RTN-VSS behavior. Thanks!

    Regards,

    Darwin