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TPS43061: Gate voltage

Dice-K
Mastermind 7808 points

Part Number: TPS43061
Other Parts Discussed in Thread: CSD17575Q3, TPS43060

Tool/software:

Hi support team,

If I use the CSD17575Q3 as the MOSFET, is the gate voltage of the TPS43061's 5.5V sufficient?
Is the TPS43060's 7.5V excessive?

Regards,
Dice-K

  • 0
    TI__Mastermind 19715 points

    Hello Dice-K,

    Thanks for reaching out to us.

    In terms of abs max ratings of this combination, both controllers could be used.

    The test conditions of the CSD17575Q3 show a 4.5V gate voltage.
    So, if there is a choice, I would recommend using the TPS43061 with 5.5V gate drivers.

    All information in this correspondence and in any related correspondence is provided “AS IS” and “with all faults” and is subject to TI’s Important Notice: http://www.ti.com/corp/docs/legal/important-notice.shtml

    Best regards
    Harry

  • 0 in reply to Harry Hofner
    Mastermind 7808 points

    Hi Harry,
    Thank you for your reply.

    The TPS43061 has a smaller VGS, so Qg is smaller.
    Smaller Qg means faster switching.
    Is there a possibility that switching noise will increase as a result?

    Regards,
    Dice-K

  • 0 in reply to Dice-K
    TI__Mastermind 19715 points

    Hello Dice-K,

    When you carefully read the datasheet, you will find that the TPS43061 does not only have a lower output voltage on the gate drivers,
    the drivers themselves are also weaker (higher inner resistance and longer rise- and fall times.
    See page 6 - Section "Power Switch Drivers".

    Fast switching FETs like the NexFets will always be challanging as they may introduce higher ringing.
    So, please implement at least some footprints for gate-resistors (maybe also a snubber) and
    take special care of a good layout with short and thick gate traces and a minimized area of the gate loop
    (forward path - to the gate of the FETs AND return path - from the Source of the FETs back to the PGND and SW pin of the controller).

    Best regards
    Harry