Gate resistor used in application note CPWR-AN28

Duclair

Hello,

In application note CPWR-AN28, peak voltage vs gate resistors are drawn in figure 25 and figure 26. I would like to know if the gate resistors as indicated on these graphs are only the external ones, or a combination of both internal and external gate resistors.

Thanks.

Forum_Moderator

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AustinC

Hi Duclair,

Do you mind to double-check the Application Note number or provide the title? I believe CPWR-AN28 refers to the mounting guide for the XM3 power module: https://assets.wolfspeed.com/uploads/2020/12/CPWR-AN28.pdf

Best Regards,

Austin C.

Duclair

Hi. Sorry, the page title on windows explorer when I open the app note is CPWR-AN28, but I just noticed the right name of the file is rather : CPWR-AN45

AustinC

Hi Duclair,

Thank you for specifying. The gate resistors listed in these plots refer to the external gate resistor (typically called RG-EXT) on the gate driver PCB only. These values also do not include the output resistance of the gate driver IC. For transparency, we utilized the Texas Instruments® UCC21710 gate driver IC for this testing.

Thanks,

Austin C.

Duclair

Ok, Thanks!

TBhatia

Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.