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  • TI Thinks Resolved

UCC27525: how to deliver accurate current ?

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Replies: 3

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Part Number: UCC27525

Dear TI Experts,

My customer want to evaluate UCC27525 to drive MOSFET, they want to deliver accurate high peak current to load. For there is no feedback in the reference schematics,

they want to know if it is possible that UCC27525 can accomplish this, if the answer is yes, what's the mechanism inside, such as how to balance the influence such as temperature?

Thanks a lot.

  • Hi Bruce Li,

    Thanks for reaching out to the High Power Drivers team, my name is Mamadou DIallo and I will help address your concern.

    UCC27525 and the rest of drivers portfolio are designed to drive power FETs therefore capable of delivering peak current to reduce switching losses. The choice of gate driver will depend on many factors including load(MOSFET's total gate charge) or the number of FETs being driven, drive current, etc...
    Knowing your switching frequency and total gate charge of the FETs, you can estimate the average gate current required to turn-on/off your MOSFET. I discuss this a bit more in the copied thread below.
    e2e.ti.com/.../782189

    Our driver's datasheet typical characteristics section (7.7)show consistent performance across temperature(-50C to 150C) and supply range variations. One thing to look out for is capacitance variations over temperature reason why we recommend 2 low ESR, ceramic parallel capacitors placed very closed to the driver's pins.

    If possible, feel free to share schematic and layout (via e2e here if no NDA or private email) so that I can review for your customer and add recommendations.

    Please let us know if you have further questions or press the green button if this helped answer your question.

    Regards,

    -Mamadou
  • In reply to Mamadou Diallo:

    Dear Mamadou,
    Thanks a lot for your timely support. I'll forward your suggestion to my customer and come back if he has further questions.
  • In reply to Bruce li:

    Sounds good.

    I look forward to their feedback.

    Please let us know if you have further questions.

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