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Original question:

LM5176: Parallel operation

LM5176: Phase Interleaving of LM5176 IC's

Carson Miller
Prodigy 10 points
Part Number: LM5176

I am working on a high-power, DC-DC converter application, and planning to use the LM5176 IC to drive the control(s) for this converter.  Given the high power, 20-40V @ 50A application, I was looking to interleave 2 phases together - with each phase being 180 degrees apart.  Output is nominally 30V, and so buck-boost functionality are both required in this application.  

However, in looking at other Power Management forums, this "master-slave" configuration of two LM5176 ICs may not be supported or functional.  Can anyone shed light on this for me?  Will these work in a master-slave configuration, for 2 interleaved phases? Or should I be looking at a different control IC.  

  • 0
    TI__Guru* 78340 points
    Hi Carson,

    Thank you for considering the LM5176. Please refer to the following application note for dual phase configuration. You may need to external clock if you want 180 degree interleaving. Note that this may not guarantee the interleaving in the buck-boost transition mode (Vin=Vout), but in pure buck and pure boost it will stay 180 degree interleaving. In the buck-boost mode, it can be random: either interleaving or in phase, depending on when each IC decide to enter the buck-boost mode.

    www.ti.com/.../snva826

    Thanks,
    Youhao Xi, Applications Engineering