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UCC27624-Q1: Negative voltage shutdown of IGBT

Grey Guo
Intellectual 1020 points
Part Number: UCC27624-Q1
Other Parts Discussed in Thread: UCC57108-Q1

Tool/software:

Hi team,

My customer wants to know whether UCC27624-Q1 can support negative voltage shutdown of IGBT. If not, is there any recommended TI devices? BTW, the low side IGBTs are required to be turned off within 3us once the input is pulled down.

Best Regards

Grey

  • +1
    TI__Genius 12275 points

    Hey Grey,

    Thank you for reaching out with our customers questions regarding the UCC27624-Q1.

    The negative voltage rating of the OUTA/OUTB pins is -0.3V for a >200ns condition. But, there is a way to achieve this negative bias to turn off the IGBT using a level shift circuit to offset the bias of the driver. The following FAQ discusses that in detail when using the UCC27624-Q1.

    [FAQ] How to drive a SiC FET or IGBT with a negative bias using a low side gate driver (bipolar drive)?

    As for the 3us turn off time requirement, the typical fall time of the UCC27624-Q1 is 10ns. Also included in that time is the propagation delay from the input falling to the output falling which is typically 17ns. So the IGBT will sufficiently be turned off within 3us. The gate resistor selections and IGBT characteristics also are a factor in how fast it will turn off.

    Let me know if there are further questions.

    Thank you,

    William Moore

  • +1 in reply to William Moore
    TI__Genius 12275 points

    Hey Grey,

    I also wanted to make you aware of the UCC57108-Q1. It is a single channel gate driver that has negative voltage handling pulldown capabilities with -15V capabilities on VEE. This allows the gate-source voltage to go negative in SiC and IGBT applications.

    Let me know if you have further questions.

    Thank you,

    William Moore