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TPS23753A: How to design for non isolated POE with an output of 24V/0.5A?

Jon WANG
Intellectual 780 points

Part Number: TPS23753A
Other Parts Discussed in Thread: TPS23753, TL431, TLV431

Tool/software:

Dears,

     The customer wants to use TPS23753 on a non isolated POE with an output of 24V/0.5A. We have found the attached document, which shows a 12V output. What parameters need to be modified to output 24V?

TPS23753APW SCH.pdf

  • 0
    TI__Mastermind 37111 points

    Hi Jon，

    Thanks for reaching out!

    I will look into your question and get back to you in this week.

    Best regards,

    Diang 

  • 0 in reply to Diang Xing
    TI__Mastermind 37111 points

    Hi Jon,

    Please see comments below and let me know if you have other questions or concerns. 

    1. Adjust the feedback loop. Make TLV431 to TL431, which has 36V rating and ~2.5V Vref. Also better to make R31 and R30 3 times or 4 times higher, R13 2 times higher.  

    2. Increase the 68uH inductor to 100 - 400uH 

    3. Adjust the D2, D2 snubber, output capacitor with higher current rating accordingly.  

    4. Make R12 3 times since BREBO rating could be low

    Best regards,

    Diang