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Thread: Request on CMTI

  1. #1
    Beginner Beginner Gyro Gearloose is on a distinguished road
    Join Date
    Aug 2019

    Request on CMTI

    Dear all,

    I have a question regarding CMTI:

    1) Why is CMTI important in a gate driver IC?
    2) What CMTI is recommended?

    Thanks in advance!


  2. #2

    Infineon Employee
    Infineon Employee
    electricuwe is on a distinguished road
    Join Date
    Sep 2019
    Dear Gyro,

    when switching SiC-Mosfets with a strong driver, a low gate resistor value and low additional parasitic capacitance dV/dt values of 50..100 kV/us can be reached. This is good to minimize losses, but there are also detrimental effects on the system:

    - a driver IC with insufficient CMTI might generate erroneous gate signals in case the internal signal transmission gets corrupted
    - current spikes will be injected to the control side even across the smallest parasitic capacitance

    If you anyhow limit dV/dt by larger gate resistors -e.g. in a drive application- of course also you driver will only see moderate stress.

    Best regards,

    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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