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TPS2373: TPS2373-4RGWR cannot work with 19V POE

Poh Kok Keng
Genius 5512 points
Part Number: TPS2373
Other Parts Discussed in Thread: TPS23754

Dear Sir/Madam,

One of my customer is using TPS2373-4RGWR for POE function. He mentioned the part TPS2373 work normally with POE. 

But they faced problem to work with 19V POE. Is there any suggestion for pin compatible device that work with 19V POE? 

Best regards,

kpk

  • 0
    TI__Mastermind 41770 points

    Hi KPK,

    Can you clarify what is 19V? Is it the voltage over the Ethernet cable? Or is it the DCDC output?

    If the Ethernet cable, then the TPS2373 cannot operate with a 19V input. Per the standard, the nominal voltage is 37-57V and the TPS2373 is designed to comply with the standard.

    If it is the output of the DCDC, this is a function of the converter design. A 19V converter design with a PoE input voltage range should be chosen from TI design library to pair with the TPS2373.

    Thanks!

    Regards,

    Darwin

  • 0 in reply to Darwin Fernandez
    Genius 5512 points

    hi Darwin,

    Customer feedbacked 19V is on the ethernet cable. any alternative suggestion or any other TI part can work with this? 

    Best rgds,

    kpk

  • 0 in reply to Poh Kok Keng
    TI__Mastermind 41770 points

    Hi kpk,

    The TPS23754 can be used in 19V PoE input because it has a PPD function. I recommend looking at the datasheet on how it works.

    Note however, that 19V is within the Classification range of the PoE standard. So the DCDC will turn ON when a 19V input is connected. This means that your solution can only work with PoE 19V and would not work with PoE since class phase of PoE would fail. If your customer has control of both sides of the ethernet cable (PSE design and PD design), then this can be a custom non-standard solution.