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LOAD sharing of 2 LM5118s

Frank Wright
Prodigy 10 points
Other Parts Discussed in Thread: LM5118

I have a board with 3 LM5118s on it 2 deliver 12VDC and one delivers 24VDC. I have a new design that needs higher power but at 12VDC. Can I tie the 2 12VDC s together? what do I need to do  if they already have there SYNC pins connected? Can this be done?

  • 0
    TI__Mastermind 21720 points
    Frank,

    Please note that load sharing the LM5118 is not recommended and is not the normal use case. One way to do it would be to have one IC act as a master and the other as a slave.
    The master would be:
    1. Populate like normal utilizing the SYNCIN signal.
    The slave IC would:
    1. Remove the Feedback resistor divider, the compensation components between FB and COMP pin.
    2. Tie the COMP pin of the master and slave together
    3. Tie the FB pin to GND.
    4. SYNCIN signal should be 90degree shift from Master SYNCIN for best output ripple performance.


    What is the new designs power level? It maybe an easier solution to design for the increased power level than trying the above approach.

    Thanks,

    Garrett