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DRV8343-Q1: Variability of Gate drive voltage

Part Number: DRV8343-Q1

I got a question from customer about Gate drive voltage.
Below figure shows one portion of EC list.

In case of VVM=13V, IVCP = 0 to 25 mA, GHx no output load
8.4V(min) 11V(Typ) 12.5V(max)

It doesn't look normal distribution.
(The typical value doesn't mean the center of distribution)

Does this device has clipping function not to go over 12.5V?
Otherwise, it means simply temperature characteristic? just like 8.4V(Hot) 11V(Room) 12.5V(Cold)
We just want to know the median value at room temp.

Regards,
Tosh+

  • Tosh,

    Thanks for posting on the MD forum!

    The High Side gate output is charge pump driven so the charge pump will adjust accordingly to provide the VCP output within the specified range. We expect that the median value at room temp will be the typical value as stated in the datasheet.

    As to the reason why the typical value is not the mid-point of the min/max, let me ask and get back to you later today.

    Regards,

    -Adam

  • Hello Adam,

    Thanks for the reply.
    OK, we understand the main reason would be related the ability of charge pump.
    However, I need something reason why the mid-point value is not center.
    I'm still waiting additional feedback from you!

    ti

  • Tosh,

    The reason the typical is not centered between the Min and Max is because these limits aren't symmetrical.

    The Min is guided by the minimum regulation of the charge pump loop, the CP is in drop out.

    The max is guided by the accuracy of the charge pump regulation loop. 

    In any case, the typical is what the CP will regulate to and what we expect the output to be.

    Regards,

    -Adam