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TPS23753A: PoE power connection

Part Number: TPS23753A

Hi

I would like to know if both of two connections of PoE power line are okay to design? (please aee the yellow circle of the circuit in attached file)

Any concern (e.g., EMC )for that ?

It seems connection2 has more thermal performance because the current loop in different HD01(diode bridge) at the same time.

Thanks!

Chin

PoE power connection.docx

  • Hello Chin,

    Thank you very much for your question. The Ethernet Alliance created a standard for power delivery other ethernet CAT cables. The standard can be found on their website: https://ethernetalliance.org by searching for "IEEE802.3 bt standard"

    (Note you might need to create an account to view the PDF)

    In this standard they outline PSE pinout configuration and permissible power supply polarity on page 40. If you do not follow this standard, then the device will need a specialized power sourcing equipment, and neither will be IEEE802.3bt compliant. 

    If you would like a reference for how it is done according to the standard, any of our EVMs or TI reference designs can be used to compare. Below I provided a PDF link to one of our schematics that includes the diode bridge input:


    Please let me know if you have any questions, or if you feel that this solved your question please indicate to us by clicking the resolved button. Thank you!

    Regards,

    Michael Pahl