I am trying to follow the tutorial for Modeling Safe Operating Area Behavior of N-Channel MOSFETs (https://www.analog.com/en/technical-articles/ltspice-modeling-safe-operating-area-behavior-of-n-channel-mosfets.html), but LTspice XVII does not have the SOAtherm-NMOS symbol that is used in the tutorial.
I have LTspice XVII installed on my PC, and it's available for me:
It's definitely not there for me. I also just updated after seeing that you have it and it's still not there.
Interesting. I purged LTspice from my PC, and reinstalled, and now seeing that the model is missing. I'll report this, and let you know when it's resolved.
jgavin - I've been informed that the SOAtherm-NMOS symbol has been obsoleted, and this functionality now works without needing that symbol.
See SOAtherm-Tutorial.asc in the examples/educational directory
The symbol SOAtherm-nmos.asy has been removed.
Excerpt from the file changelog.txt : 01/18/19 Removed the obsoleted SOA accounting files from new installations.
If you had installed LTspiceXVII before this date, the symbol is still t here, because LTspice hasn't removed it in the newer version.
Even if you still have this out-dated symbol, you can't use it anymore, because the model-file belonging to this symbol has been removed by the later versions of LTspiceXVII.
In the old way of SOAterm, a subcircuit has been used for this model in the simulation. I guees it had increased the simulation time too much.
The new method of SOAtherm:
First I recommend to run the example from the folder Examples.
When the simulation of this example has finished, it plots tj#q1 and tc#q1. The default ambient temperature is 85°C. You can change the assumed ambient temperature with the procedure below.
CTRL-right-mouse-click on the Mosfet -> a dialog box will appearEnter in SpiceLine Tambient=50Click on "Vis"in this line, if you want make this parameter visible in the schematicOK
VDMOS-models which have thermal parameters can be identified by looking for the parameter "Rtheta" in its VDMOS model. Only a small percentage of the models have thermal data. The thermal calculations are only done if the following SPICE-directive is in the schematic.