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TPS2384 - Recommended 48V isolated power supply

Alex Silva
Prodigy 140 points
Other Parts Discussed in Thread: LM5122

Hello everyone,

I'm designing a pcb using the TPS2384 quad PoE controller and I'd like to power it up with a 48V isolated power supply which could provide at least 2.4A, however I haven't been able to find one. Could someone please recommend me one, or at least put me on the right track? My input voltage range is +9V to +20V DC.

Thanks in advance,

Alex.

  • 0
    TI__Genius 9130 points
    Alex

    The best place to start is to look at the selection of existing TI-Designs and TI reference designs, accessible here:

    www.ti.com/.../refdesignsearchresults.tsp

    If you click on "Search power designs by parameters", you can filter the results by input voltage, output voltage, output current, AC or DC input, isolated or non-isolated output, etc.


    Searching for 9-20 V input range, with > 44 V output, 10 results are listed. Of these, the following could be of interest to you:

    http://www.ti.com/tool/PMP7966
    6-42 V input range, 52-V output @ 2.5 A, uses LM5122 boost controller - could be adapted to 48-V output

    http://www.ti.com/tool/PMP8532
    6.5-36 V input range, 51-V output @ 1.25 A, uses LM5122 boost controller - could be adapted to 48-V output, but maybe requires more work to increase the power level.


    There are also other solutions but at much lower power.


    Hopefully one of these may be suitable for you, or least get you started.

    If this answers your question, please click the "verify answer" button.

    Thanks,
    Bernard
  • 0 in reply to Bernard Keogh
    Prodigy 140 points
    Hello Bernard,

    Thanks for your reply.
    I need it to be isolated. The closest one I found was: www.ti.com/.../PMP20058 (8V to 18Vin, 54Vout @ 1.5A out)
    54V out would work for me but I need more power. How would I increase from 1.5A to 2.4A?

    Regards,
    Alex
  • 0 in reply to Alex Silva
    TI__Intellectual 925 points

    Hi Alex,

    I am the designer of PMP20058. I personally modified PMP20058 to 54Vout @ 1.9A (100W) only at 12Vin, at 8V or 9Vin, peak primary curent is much higher than 12Vin, the primary FETs are sustaining a lot loss, and thermal is an issue. If you refer to my test report, at 8Vin, I could not even run the full power of 1.5A.

    48Vout @ 2.4A is close to 115W, my PMP20058 will run into thermal issue at 9Vin.

    Do you plan to have any heatsink or airflow present in your system?

    Best regards,

    Max