- #1
Number2Pencil
- 208
- 1
Greetings. I am not sure how to approximate a MOSFET's switching energy from datasheet parameters. I have stumbled upon a few ways, but in all cases I've found it is pretty rare to find a datasheet with all the correct parameters.
Here are some ways I've found:
1) Eon and Eoff are listed directly in the datasheet. Very rare find.
2) The turn-on/turn-off voltage and current waveforms are provided on a single time plot, so I can multiply them together and integrate (usually with geometric approximations). Also very rare.
3) The method outlined in this document:
http://www.btipnow.com/library/whit...lculation Using the Data-Sheet Parameters.pdf. Seems to be based off of a particular test-circuit (some test circuits have Rg going from the gate to ground instead of gate to pulse generator and don't include the upper mosfet/inductor). Also, the "gate plateau voltage" is a rare find in the datasheets for me...unless it is listed with a different name. I actually haven't found any datasheets with this parameter listed.
So I'd like to know if there is a way to approximate switching energy that could be derived from the most common mosfet datasheet parameters.
Thanks in advance
Here are some ways I've found:
1) Eon and Eoff are listed directly in the datasheet. Very rare find.
2) The turn-on/turn-off voltage and current waveforms are provided on a single time plot, so I can multiply them together and integrate (usually with geometric approximations). Also very rare.
3) The method outlined in this document:
http://www.btipnow.com/library/whit...lculation Using the Data-Sheet Parameters.pdf. Seems to be based off of a particular test-circuit (some test circuits have Rg going from the gate to ground instead of gate to pulse generator and don't include the upper mosfet/inductor). Also, the "gate plateau voltage" is a rare find in the datasheets for me...unless it is listed with a different name. I actually haven't found any datasheets with this parameter listed.
So I'd like to know if there is a way to approximate switching energy that could be derived from the most common mosfet datasheet parameters.
Thanks in advance