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TPS23754EVM-420: Clarifications on transformer operation

Jejomar Ildefonso
Genius 9550 points
Part Number: TPS23754EVM-420
Other Parts Discussed in Thread: TPS23754, TPS23730

Hi Team,

Our customer intends to use the TPS23754EVM-420 but just had some queries particularly on how it works with the transformer. The user guide says that a separate 24V or 48V adapter may also be used instead of the PoE connection. However, we've checked the transformer (POE300F-50L) datasheet and it was mentioned that its operating supply voltage is 36V–72V.

May we know how does the transformer work generally with the EVM considering the EVM operates at 24V, outside of the transformer's operating range?

Thanks in advance!


Kind Regards,

Jejomar

  • +1
    TI__Mastermind 21320 points

    Jejomar, 

    The TPS23754 accepts a 24Vin with jumpers J8 and J9. They must be selected to use PPD instead of APD. 

    The DCDC does work for 24Vin despite the transformer input voltage rating. The range given by the transformer vendor is standard for PoE input range. However, a transformer still has inductance no matter what voltage is put across it. Although the transformer may not say that it accepts wide-Vin, we have tested it and can confirm that our DCDC design works. 

    I will say, we have a wide-Vin (16V-57V) design that is 5V/5A out that uses our new TPS23730. The TPS2373x is the new generation of parts for the TPS23754. Please send me an internal email and I can share the design. So this new design would directly replace this one with lower cost, board space and other design improvements. Thanks. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    TI__Genius 9550 points

    Hi Michael,

    Many thanks for your support! We've shared these information to the customer and it really helped them a lot.

    They're also interested in seeing the proposed reference design based on TPS23730. I've sent you an internal email referencing this post to follow-up. Thank you!


    Kind Regards,

    Jejomar