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LM5143-Q1: Estimation of the body diode reverse recovery current possible?

Catherine
Prodigy 20 points
Part Number: LM5143-Q1

Hello,

is there any possibility to estimate the peak value of the body diode reverse recovery current if you use the settings as told in the datasheet?

Thank you.

  • 0
    TI__Guru 73752 points

    Hi Catherine,

    The body diode reverse recovery current is determined by the low-side FET. The Qrr value for a given forward current is typically provided in the MOSFET datasheet. If the reverse recovery pulse of current is assumed to be triangular, then Qrr =~ Irr*trr/2.

    Fortunately, the LM5143-Q1 controller has a short deadtime - under 20ns - this helps to minimize the resultant recovery charge. You can also use the LM5143-Q1 quickstart calculator to examine MOSFET power losses, see www.ti.com/tool/lm5143design-calc.
     
    Regards,
    Tim