Hi,

I would like to analyze the junction temperature of a SCT3022AL MOSFET during switching operation on LTspice.

Followint the Spice model and the thermal model of the MOSFET:

https://www.rohm.com/products/sic-power-devices/sic-mosfet/sct3022al-product/documents

I'm going to use SOAtherm-Nmos block.

Unfortunately the thermal model of SCT3022AL is not alredy inserted inside the block.

How can I add the thermal model given in the above link into this block?

Thank You.

 

Here you go..

Attached...

eT

 

Here you go..

Attached...

eT

Thank You, but what is the procedure to add the thermal model into the library?

 

Hi

There are different philosophies and ways to do this..here’s one way.

Copy the symbol file to the default LTspice “sym” folder of your choice.

Rename the model file so it has a .sub extension, then copy the model file to the default LTspice “sub” folder.

The default folders are both located under the LTspiceXVII folder in “Documents”.

You can then select the symbol from the component selector.

eT

 

Thanks for your great share.

I am wondering how did you generate the 'nmos_rohm_t.asy ' symbol file?

Instead of this, since the LTspice has already the SOAtherm-Nmos block in the library, could we use that block ? However, that block only contains limited MOS selections as attached picture shown, my question is then how could we define the thermal model to be used in this block? LT provides the 'user-defined' option as shown on picture, but I failed to define that.

To be more specific, I have the SISS06DN_PS spice model as attached. Could you help on how to use this model to be fitted into the SOAtherm block in LT?

Thank you very much for your kind reply.