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LM2677 in Parallel

Rikil Shah
Prodigy 20 points
Other Parts Discussed in Thread: LM2677, LM3150, LMZ23608

Hello,

I am designing a power supply in which I need more than 6.5A current whereas as per Datasheet LM2677 provides 5A max. So, I was wondering if is it possible to parallel outputs of LM2677. Usually, I understand that it is not recommended to parallel two PSUs but LM2677 has Output Sync pulse so I though if we could give same oscillator pulse to both LM2677 and that way we could parallel two outputs without one output getting sinked in other.

Best Regards.

  • 0
    TI__Expert 3840 points

    Hi Rikil,

    The LM2677 architecture does not allow for current-sharing and paralleling of multiple outputs since both control loops will be fighting each other.  If you need wide-input voltage ranges similar to the ones offered by the LM2677 and currents in excess of 5.0A, I recommend you to use a buck controller such as the LM3150.  If you want to simplify your design and have an integrated solution, including an in-package integrated inductor, you can use the LMZ23608 Power Module.

    Regards,

    -JP

  • 0 in reply to Juan Paulo Fung
    Prodigy 20 points

    Thanks Juan for the info. Although, LMZ23608 is a great solution but Pricing is bit pointy for my application. LM3150 is a good solution. Although, one more thing I would like to clarify. Is it possible to make Isolated output by introducing coupling transformer at output inductor? I am referring AN-1081 for this idea which is attached herewith. My ultimate goal is to create Two isolated outputs of 24V, 2A and 48V,2A for a 18-30V input. Also, if you have anything better than this, Kindly let me know.

     4237.Low_cost_DCDC_TI.pdf