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TPS23758: non-isolated PD solution

George Zhao
Intellectual 1635 points
Part Number: TPS23758
Other Parts Discussed in Thread: TPS23755

Hi team,

Do we have reference design or guide for a non-isolated PD instead of flyback based on TPS23758?

Thanks.

George

  • 0
    TI__Expert 3700 points

    Hi George,

    Thank you for your question.

    We do not have a reference design for a non-isolated PD using the TPS23758. However, we have a design that uses the TPS23755 in a non-isolated buck. Please find the BOM, schematic and test report files attached.

    In general, the TPS23755 is recommended for lowest cost buck solution over the TPS23758. However, the TPS23755 can be replaced with the TPS23758 in the attached design and used for non-isolated applications as well. 

    Please let me know if you have any additional questions. Thanks!

    TPS23755 Buck PSIL048E1(001)_Sch (3).PDFTPS23755 Buck PSIL048E1(001)_BOM (3).xlsTPS23755 Buck PSIL048 RevE1 Test Report (3).docx

    Best Regards,

    Brett Colteaux

    PoE Product Marketing Engineer

  • 0 in reply to Brett Colteaux
    TI__Intellectual 1635 points

    Hi Brett,

    Thanks for reply.

    Looks like it only supports 7.5W maximum, what if customer needs class 3 which is 13W?  is it still suitable?

    George

  • 0 in reply to George Zhao
    TI__Expert 3700 points

    Hi George, 

    The TPS23755 and TPS23758 devices integrate the switching FET. As a result, the current is the limiting factor for total power consumption. That is, the TPS23755/58 devices can support the following voltages/power levels in non-isolated applications:

    1. 12V at Class 3 power levels

    2. 5V at Class 2 power levels

    3. 3.3V at Class 1 power levels

    If the design requires a 12V non-isolated rail, then these devices can be used to support the full 13W. However, with voltages lower than 12V, these devices can not support the higher current required. 

    Please let me know if you have any additional questions. Thanks! 

    Best Regards,

    Brett Colteaux

    PoE Product Marketing Engineer