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TPS23758EVM-080: Use the TPS23758 as buck converter

Sunset
Genius 13985 points
Part Number: TPS23758EVM-080
Other Parts Discussed in Thread: TPS23758, TPS23755

Hello Team,

cab we use the TPS23758 as buck converter, in particular to get a PoE solution via the TPS23758 and generate Vout 3.3V?

Not optimal but 5Vout could be an option as well?

Do we have any reference design for it?

Thanks,

SunSet

  • 0
    TI__Genius 15275 points

    Hi SunSet,

    Since TPS23758 PD has no-opto sync flyback DC-DC controller, we typically do not use this device for buck converter designs. Thus, we do not have any reference designs for 5V or 3.3V for a buck converter, only flyback topology. 

    Typically for Type 2 power buck topology, we recommend using TPS23755. With this device we have some reference designs for 3.3V and 5V.

    Very Respectfully,

    Brandon Beader

  • 0 in reply to Brandon Beader
    TI__Genius 13985 points

    For the TPS23755 I have seen the reference design. I have shared it.

    So the TPS23758  is really a no go as buck, "not working" or not recommended since we have not done any test?

    Thanks,

    SunSet

  • +1 in reply to Sunset
    TI__Genius 15275 points

    It is not necessarily a "no go", it is achievable and would be very similar to TPS23755 as these devices are P2P. The reason we use TPS23755 over TPS23758 for buck converters is due to aux control which allows for smooth transition. Since it is non-isolated we can assume the aux power will be same as the output voltage and therefore OR'd at the output.

    TPS23758 would work and almost mirror reference design for TPS23755, we just do not have any current ones produced due to the reason above.

    Very Respectfully,

    Brandon Beader