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Original question:

TPS2376: TPS2376PWR

TPS2376-H: Can I use only the UVLO function to turn on the PD at 22V without mounting RDet and Rclass?

Said Djedid
Prodigy 30 points
Part Number: TPS2376-H


Tool/software:

Hi,

If I use a non IEEE compliant PSE , can I use only the UVLO function to turn on the PD at 22V without mounting RDet and Rclass?

Then when I use a IEEE compliant PSE, Rdet and Rclass need to be mounted.

Thank you.

Said

  • 0
    TI__Mastermind 37111 points

    Hi Said,

    Thanks for reaching out!

    The adjustable UVLO is for the internal hotswap's UVLO. For non compliant PSE or passive PoE injector without detection/classification, RDet and Rclass are not needed and the PD can be turned on when UVLO is reached (meanwhile VDD-VSS is higher than the internal circuit startup voltage, which is ~13V).

    And yes, for standard PSE, you need correct RDet and Rclass to pass detection and classification. Or the standard PSE won't turn on its port.

    Best regards,

    Diang