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UCC27511A: connecting the Two power Mosfets in parallel with one driver ucc27511

hema danda
Prodigy 160 points
Part Number: UCC27511A
Other Parts Discussed in Thread: UCC27511, UCC27531, , UCC27624, UCC27614

Tool/software:

HI

I am Driving two parallel mosfets for PFC using one driver IC ucc27511

or else I can use dual channel driver ucc27531  for two MOSFETs with inputs INA and INB  short 

Which one of the above approaches would be good for a 2.2kw design 

I am attac hing images  both down below

  • 0
    TI__Expert 8771 points

    Hi Hema,

    The primary reason to use a dual-channel gate driver would be to control the FETs independently. If you are switching the FETs at the same time, you could use one gate driver to drive multiple FETs in parallel (provided that they are connected to the same source). However, the overall capacitance increases when more FETs are added, so the rise/fall time may be slower when compared to the datasheet specs.

    Your schematic with the UCC27511A looks good to me, but the UCC27531 is actually not a dual-channel gate driver. Did you get that schematic model from TI?

    If you would like to use a dual-channel gate driver, then I would recommend the UCC27624, which is part of our latest generation of low-side gate drivers. If you would like to use one gate driver to drive the two FETs, then I would recommend the UCC27614 over the UCC27511A. The UCC27614 is the single-channel variant of the UCC27624, and has a 10A peak output current.

    Thanks,
    Rubas