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negative input to positive output

WER-HSIANG LO
Prodigy 10 points
Other Parts Discussed in Thread: UCC2897A, LM5122, PMP20371

Hi Team,

May I know if there is any suitable solution, either device or reference design, for the following spec?

100W Power

Input voltage: -34V to -100V range

Output voltage: 12V

Output current: 8.3A

  • 0
    TI__Intellectual 2770 points

    Hello Sir,

    if it needs to be isolated for 100W an Active Clamp Forward Converter is the right choice, UCC2897A.

    If it's non isolated a boost controller is needed to build a positive referenced inverting buck boost topology.
    For this current level synchronous rectification is beneficial, so a boost controller that supports SR is needed.
    Unfortunately LM5122 can't handle the -100V input voltage, ends up at 65V.

    PMP20371 shows a built & tested design for topology mentioned above:

    https://www.ti.com/tool/PMP20371

    Best regards, Bernd