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LM5177: Parallel connection of 4 switch buck/boost converters for supercap charging 0-28.2V @ 80A from 18-26V

user4928306
Prodigy 115 points
Part Number: LM5177

Tool/software:

I'm looking to design an 80A supercap charger that will charge 1360F from 0-28.2V from an 18-26V source in <10 minutes.

I have seen the application notes on multiple LM5177 being operated in parallel with a phase shifted clock source.

Is there a limit or trade off on the number of parallel converters aside from size/cost? Is there a practical limit to the number of synchronised parallel converters?

Would I be better off with 2 x 40A converters, 4 x 20A converters or 8 x 10A converters for example?

Is the LM5177, LM51770 a suitable device or is there a more suitable device for the application?

Have I settled on the wrong topology- is there something more suitable?

Automotive rating would be an advantage.

  • 0
    TI__Guru 58661 points

    Hi,

    yes, the LM51770 can be used for that (Note: recommend to use the newer version LM51770 instead of the LM5177).

    There is no strict limit of amount of devices which can be used for the parallel operation here. What number of phases are required needs to be decided by the design of the power stage and the losses which can be handled.

    Note: for your parameters also the LM51772 could be used - this would provide the option to have two phases without the need of an external clock generator as it could provide a 180 degree phase shifted clock for the second phase (device).

    All of that devices (LM51770 and LM51772 are or will be available as automotive version)

    Best regards,

     Stefan