How to model the losses of MOSFET with Diode?

Question

I'm trying to model the losses of Microsemi MOSFET in a buck converter. The data sheet has information about losses at just two values (I=40A V=800V and corresponding losses at 25degC and 150degC). I believe this doesn't give a realistic figure. However I tried to model using the two values and I'm getting error for negative switching loss. I've attached the datasheet and screenshot of error.

Answer 1

Hello,

With this particular datasheet, there is limited information available as you mentioned, and we recommend you contact the manufacturer to request additional datapoints, curves, etc. To fully diagnose the issue regarding the error message, we would need to see your model and thermal description files. This might be easily fixed with a few additional datapoints in the thermal description. It might also be that the thermal cooling network is insufficient or that you are not operating the device within its normal range.

Regards,

Kris