Strange thing about the plecs switching loss calculation

hi lok,

What I mentioned earlier isn’t accurate, and I’ve removed it from this thread to avoid confusion. What is happening is the high-side switch at turn off has positive blocking voltage right after turn off and NEGATIVE conducting current right before turn off. In the thermal description for C3M0045065J1 the losses for this condition is zero and thus you are not seeing any turn-off switching losses.

In your setup, the high-side switch will effectively experience diode reverse recovery, which is typically modeled as a loss by extending the switching loss calculation to include positive blocking voltage and negative conducting current. Please see Diode reverse recovery loss modelling using the MOSFET-with-diode component - #2 by Bryan_Lieblick .

To obtain accurate results, you will need to contact the Wolfspeed applications team to determine whether they can provide the necessary reverse recovery data for your device.

Hope this helps and sorry about the confusion.