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Thread: Question about the voltage-class

  1. #1
    Beginner Beginner JoFoe is on a distinguished road
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    Question about the voltage-class

    Hey all,
    is it mandatory to use -5V during turn-off? Can 0 V be used?

  2. #2

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    I believe you are asking the gate voltage window.

    For the gate voltage, please follow the application note. 0V is recommend for the discrete devices.

    https://www.infineon.com/dgdl/Infine...63b098fe26306a
    Last edited by YUAN; Aug 19th, 2019 at 09:50 AM.

  3. #3

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    Also for the Easy modules 0 V can be used in case simplicity of the design has priority vs. switching speed. With a higher turn-on gate resistor the dV/dt can be reduced to a level that also modules - inspite of their longer internal and external gate connections - can be operated with 0 V. In some applications - like drives - dV/dt needs to be limited anyhow to avoid adverse effects on the machine windings and bearings.
    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.

  4. #4
    Beginner Beginner Fränce is on a distinguished road
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    Quote Originally Posted by YUAN View Post
    I believe you are asking the gate voltage window.

    For the gate voltage, please follow the application note. 0V is recommend for the discrete devices.

    https://www.infineon.com/dgdl/Infine...63b098fe26306a
    Dear YUAN,
    I had a look at the application note AN2018-09 and i am not sure if the the IMZ120R030M1H is able to operate with a gate voltage of +18/-5. Is it safe to operate the device for a reasonable amount of time?
    Could you please clarify?

  5. #5

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    It really depending on the what is the reasonable time and the switching frequency. In the appnote, we translate the total switching events into a nominalized switching frequency. Please calculate the total switching events in your application, if your switching fsw * total designed operation time is smaller than 10k*10*365*24*3600, then 18/-5V(including undershoot) is OK. However, CoolSiC MOSFET is very robust against parasitic turn-on effects, we do not see the reason to have such low turn-off voltage.
    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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