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Help selecting power over ethernet (power source) chips

user1845401
Prodigy 180 points

Hello,
We want to design a new device that can accept ethernet at 2.5G over copper, and then it outputs at 2.5G with power over ethernet. I need to select a chip that can supply power over ethernet (power source) in this way. Can anyone recommend a product that can support this? I would prefer if there was an existing product that includes a reference design. Thank you.

  • 0
    TI__Genius 15275 points

    Nice to meet you!

    I can assist you in selecting the correct Power over Ethernet (PoE) device, could you answer the following questions to help me guide you in the right direction:

    - What is the power level need?

    - What is the output voltage?

    - Is isolation needed?

    - Is efficiency or BOM cost priority?

    - Are there any specific IEEE802.3bt standard or at standard features needed?

    These will help me select correct device for you and provide you with reference design for your needs!

    Very Respectfully,

    Brandon Beader

  • 0 in reply to Brandon Beader
    Prodigy 180 points

    Hi Brandon,
    - Total power up to 250 W would be desired. If a single chip has lower power rating, can we run these in parallel?
    - Voltage up to +48VDC that can provide an auto detcted +24V/+48V both 2 pair and 4 pair PoE
    - Isolation would be nice but not required
    - BOM cost is a priority but we are willing to spend more on a chipset to get the features we want
    - I don't have a specific IEEE standard in mind

  • 0 in reply to user1845401
    TI__Mastermind 37121 points

    Dear Sir/Madam,

    Thanks for your information.

    -A single chip can support up to 71.3 W (Class 8, the highest PD power rating from existing IEEE802.3bt standard). TI has TPS2372-4 and TPS2373-4 for 71.3 W rating. TI has reference design but it is up to two paralleled input PoEs. You could take a look for its schematic.PMP22492B(001)_Sch.PDF

    -The PoE input voltage is normally 37-57 V, if isolation is not required, for the considering of low cost and high efficiency, would mind to have non-regulated output voltage (just use the PoE PD chip as a circuit breaker between Vin and Vout)? 

    Updated on Jan/2023: I will closed this thread for now as we have not received your reply for a relative long period. Please open a new thread if you have any further questions. 

    Best regards,

    Diang