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LMG3522R030-Q1: Conduction in third Quadrant

Oscar Liborio
Intellectual 1020 points
Part Number: LMG3522R030-Q1


Tool/software:

Hi,

Is it possible to avoid current conduction in the third quadrant with this device?

Bests,

Oscar

  • 0
    TI__Expert 7435 points

    Hi Oscar,

    The GaN device can't block voltage in the reverse direction. To avoid third quadrant conduction losses, if you turn the device on you'll only have Rdson conduction losses.

    Best,

    Kyle Wolf  

  • 0 in reply to Kyle Wolf
    TI__Intellectual 1020 points

    Hi Kyle,

    I am not sure If I fully understood your point.

    You mean if they leave the device on they will have just conduction but no switching losses?

    BR

    Oscar

  • 0 in reply to Oscar Liborio
    TI__Expert 7435 points

    Hi Oscar,

    GaN cannot block in the reverse direction (source to drain). When there is current from source to drain, the conduction losses will be different if you drive the gate on or drive the gate off.

    In the gate off case with current from source to drain the conduction losses will be Vsd * Isd (Vsd can be found in the datasheet figure 5-6)

    In the gate on case with current from source to drain the conduction losses will be: Irms^2*Rdson 

    Best,

    Kyle Wolf