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Input: -24V DC; Output: 5V, 100mA

Hi team,

Does TI has a proper solution for below requirements?

Input: -24V DC

Output: 5V, 100mA, no isolation

Many thanks!

Bell

4 Replies

  • Hello Bell,

     If you go to the TI Reference Designs: http://www.ti.com/power-management/reference-designs.html , the closest design we have is an inverting buck-boost PMP20371: http://www.ti.com/tool/PMP20371 .

    This could be a good start; you would have to take the design concepts and change to match your requirements.

    I will also look for any other solutions we might have.  Let me know if you can work from this PMP20371 design.

    ~Leonard 

      

  • In reply to LeonardEllis:

    Hi Leonard ,

    Thanks a lot for your answer. this seems to be a good solution. I will check with customer and feedback you later.

    regards,
    Bell
  • In reply to LeonardEllis:

    Hi Leonard ,

    Thanks for the feedback. we also have considered this topology like below. While, the only concern is that: the output 5V (actual 29V) is reference to the -24V input. When the input -24V is not stable (there can be some fluctuation), the output 5V can also have a 1:1 change. this can be a big problem.

    Do you have any idea to solve this problem? thanks!

    regards,

    Bell

  • In reply to Bell Ye:

    Bell,

    Please look at the following reference design. The TPS40210 is utilized and transforms -12V to +12V @1A. This might be a good starting point for our application.
    www.ti.com/.../PMP4742

    More reference designs can be found on the TI Designs website.
    www.ti.com/.../refdesignsearchresults.tsp

    Thanks,

    Garrett

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