Hello,

I am new to plecs and I trying to estimate losses of synchronous buck converter using the a mosfet with body diode. The mosfet I have chosen is **STL210N4F7AG. **

The questions I have are as follows:

- I am using formula based turn and turnoff loss calculation as manufacturer’s datasheet doesn’t provide turn on and turn off loss energies in their datasheet. Plecs has certain rules regarding voltage and current convention of mosfet with diode, I am getting errors when plecs tries to compute
**negative switching losses.**(which I am ignoring in diagnosis tab) - The manufacturer datasheet provides only +ve voltage and +ve current (1
^{st}quadrant characteristics) for mosfet but no -ve current and –ve voltage (3^{rd}quadrant characteristics, which are required by plecs to estimate reverse conduction losses). So plecs throws again**negative conduction losses**.

I want to know how can I bypass this by not ignoring negative switching and conduction losses (so that they can finally add up to total switching losses at the end)?

Thank you for the analysis and suggestions. I will check accordingly and revert back if required.