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UCC24624: Paralleling 2x UCC24624s

Mitchell
Expert 4915 points
Part Number: UCC24624
Other Parts Discussed in Thread: PMP21683

Hi Team, 

My customer wants to have a SR with paralleled FETs with a gate charge of 250 nC driven at 100kHz to 160kHz, which I think will be too much for one UCC24624. Would there be any issue with paralleling two UCC24624s to drive the FETs?

Thanks,
Mitchell

  • 0
    TI__Mastermind 27135 points

    Hi Mitchell,

    One concern I would have is with the tolerance of the turn-on threshold, you may have cases where one UCC24624 decides to turn on but the other does not. The two gate drives would fight each other with one trying to turn on and the other trying to stay off. 

    One scheme that has been used before when multiple MOSFETs are preferred for spreading out the power dissipation is to use FETs with a lower miller plateau and supply the UCC24624 with a lower VDD voltage (~5V or so). The gate charge will be smaller while still being able to fully turn on the FETs. PMP21683 is an example using this approach to drive 4x FETs on each side with one UCC24624:https://www.ti.com/tool/PMP21683

    Best Regards,

    Ben Lough