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DRV8320R: Average gate drive current

Part Number: DRV8320R
Other Parts Discussed in Thread: DRV8320

Hi team,

I have a question for average gate drive current.

Our customer is considering wheter DRV8320 matches their specification.

The average gate drive current is written in the data sheet as followed:

  

We have found application notes like this and are reading about the column of average gate drive current.

www.tij.co.jp/.../slva714b.pdf

Although there was an explanation as above, in this calculation, Qgd is substituted for Qg in equation (7).

I do not know why to calculate with Qgd.

Could you explain the reason to substitute Qgd for Qg?

Best regards,

Tomoaki Yoshida