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LMG3411R050: max fsw

HS FAE Germany
Mastermind 31125 points
Part Number: LMG3411R050
Other Parts Discussed in Thread: LMG3410R050

Hello,

in datasheet fsw is set to typical 0.5MHz.

What is the limiting factor for fsw?

Is it possible to use this device with fsw 1-2MHz?

Regards, Holger

  • 0
    TI__Genius 16390 points

    Hello Holger,

    Thanks for contacting us. The limiting factor for fsw is the amount of loss and heat generated. As the switching loss is directly proportional to the switching frequency, the higher switching frequency will generate higher losses, and thus more heat.

    It is possible to switch at a higher frequency, and the actual maximum frequency depends on the PCB design and the cooling method. While you try to push the frequency higher, please keep monitoring the FET temperature and make sure it's in a reasonable range.

    Regards,

  • 0 in reply to Yichi Zhang.
    TI__Mastermind 31125 points

    Hello Yichi,
    what is the max frequency you have experiences with? Any reference design?

    > please keep monitoring the FET temperature and make sure it's in a reasonable range.
    What is a reasonable temperature range?

    Regards, Holger

  • 0 in reply to HS FAE Germany
    TI__Expert 3225 points

    Hello Holger,

    The max. frequency of our LMG3410R050 is about 1.2MHz. There is a buck-boost converter with a max. current limit output on the converter. If you exceed the GaN switching frequency, you can see the UVLO reporting since the buck-boost cannot supply the enough current for GaN to switch on and off.

    As is mentioned in the datasheet, the max. recommended temperature is 125C. Thanks!

    Yichi Zhang

    Systems Engineer

    ti.com/GaN