Question about ADuM3221A

Hi All,

ADuM3221A can be used as a driver for GaN Transistor? GaN needs +6V and -3V (Source and Sink) of

gate voltage. Please check the attached rough schematic and let me know if something wrong with it.

Regards,

Kazu

ADuM3321forGaNDriver.pdf
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  • 0
    •  Analog Employees 
    on Jul 19, 2017 9:39 PM

    Hello Kazu,

    The schematic you have drawn is correct, and a possible implementation of driving GaN. I don't recommend using the ADuM3221, though, for a few reasons:

    1) The CMTI is only 25 kV/µs, and GaN usually switches at a very fast slew rate

    2) The ADuM3221 has two channels, so unless you are using both, and are both referenced to the same isolated ground, it has a wasted channel.

    I recommend looking at the ADuM4120 or ADuM4121 for a single channel, high CMTI gate driver solution. The same setup will work on the ADuM4120 or ADuM4121.

    RSchnell

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  • 0
    •  Analog Employees 
    on Jul 19, 2017 9:39 PM

    Hello Kazu,

    The schematic you have drawn is correct, and a possible implementation of driving GaN. I don't recommend using the ADuM3221, though, for a few reasons:

    1) The CMTI is only 25 kV/µs, and GaN usually switches at a very fast slew rate

    2) The ADuM3221 has two channels, so unless you are using both, and are both referenced to the same isolated ground, it has a wasted channel.

    I recommend looking at the ADuM4120 or ADuM4121 for a single channel, high CMTI gate driver solution. The same setup will work on the ADuM4120 or ADuM4121.

    RSchnell

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