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Silicon Carbide Avalanche Energy

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StevenB
StevenB Contributor Level 1
edited October 2024 in Discrete Products

Id like to know how a SiC mosfet Avalanche can be tested at low (eg 50V) voltages?

Isn't the avalanche triggered by excess/over voltage? Or is the avalanche trigger voltage 'decoupled' from the 'avalanche' test?

Also why is this avalanche rating no longer listed in more recent products?

Kind regards,

Steven

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  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

  • jshao
    jshao Wolfspeed Employee - Contributor Level 2
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    Hi Steven,

    Avalanche test is also called unclamped inductive switching(UIS). The diagram is shown below. Vdd =50V is ok, as long as enough energy in the inductor to trigger the avalanche when the device is turned off.

    image.png

    Since avalanche rating is not a standard parameter, so it is not listed in the datasheet from Wolfspeed.

    Thanks,

    Jianwen

  • StevenB
    StevenB Contributor Level 1
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    Thank you for the clarification.

    //Steven

  • jshao
    jshao Wolfspeed Employee - Contributor Level 2
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    You are welcome. If you don't have any further question, I close this discussion.

This discussion has been closed.