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Original question:

UCC28070: ucc28070 current sample question

UCC28070: gate drive clamped voltage

Jerry Chen
Expert 5110 points
Part Number: UCC28070

Hi team,

Below is the schematics of customer gate drive. They have little confuses about datasheet specs.

1. VCC can be as high as 20V in datasheet, how it be clamped to 13.5V without damage?

2. Why the typical gate drive is 13V not 13.5V?

Thanks.

  • 0
    TI__Genius 9140 points

    hello Jerry,

    There has an buck/LDO in the controller from VCC  to  the supply for Driving circuit and limit the GDA/GDB to be 13.5V. if the loss is not so high, it should be safe with damage.

    for the second question, my understanding is it should be typical 13.5V.

    Let me confirm with IC design about this parameter and feedback to you.

  • +1 in reply to David Huang33
    TI__Genius 9140 points

    Hello Jerry,

    feedback from the designer, the target of the clamped voltage is 13.5V, but in real design of the IC through temperature characterization, it did not match well with the original target but are not off far enough to be concerned about.

    keep in mind, the specifications in the Electrical Characteristics table take precedence, of course, and min and max are the only numbers that are guaranteed.

    hope this helps you.