Let's use LTspice - Let's add a SPICE model (3) - Semiconductor business -Macnica

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This time, I will introduce how to use LTspice to perform a circuit simulation of ONSEMI's SiC MOSFET product spice model.

First, we will introduce how to download and install SPICE model of ONSEMI SiC MOSFET products.

Finally, circuit simulation is performed using the LT8316, a micropower isolated flyback controller that does not require an optical isolator.

If you are just starting LTspice, we recommend that you look at the "basics" from the list below.

Let's use LTspice series list is here

Also, if you would like to see a video on how to write a basic circuit and how to execute it, there is an on-demand seminar that does not require you to enter personal information, so please take a look if you are interested. Detailed information about the seminar is also provided to those who fill in the questionnaire.

LTspice On-Demand Seminar - Function check with RC circuit -

Download the SiC MOSFET SPICE model

ONSEMI has released three types of SPICE models for SiC MOSFET products: the PSpice model, the SIMetrix model, and the LTspice model.

The public spice model can be downloaded from the link below.

https://www.onsemi.com/design/resources/design-resources/models?category=18460

The spice model for LTspice uses the one described as LTspice (or ltspice, LTSPICE) in the Document Title.

This time, we will use the 900V withstand voltage SiC MOSFET Spice model.

Click the Document Title "ONSEMI SiCMOSFET 900 LTspice Model" to automatically download the Zip file containing the spice model.

Importing spice models

When you unzip the downloaded Zip file, the following files and folders exist in the folder.

・"Symbol" folder: SiC MOSFET schematic symbol files are stored.
・“ONSEMI_SiCMOSFET_900_ltspice.txt”: Spice model showing the electrical characteristics of SiC MOSFET.

This ONSEMI_SiCMOSFET_900_ltspice.txt is encrypted for use only with LTspice.

To use this model, do the following:

1. Create a new “ONSEMI” folder in the LTspice directory (C:\Users\(user name)\Documents\LTspiceXVII\lib\sub).
(The folder name can be set arbitrarily.)

2. Store the downloaded “ONSEMI_SiCMOSFET_900_ltspice.txt” in the “ONSEMI” folder created in step 1.

3. Create a new “SiC MOSFET” folder in the LTspice directory (C:\Users\(user name)\Documents\LTspiceXVII\lib\sym).
(The folder name can be set arbitrarily.)

4. Store the schematic symbol file stored in the downloaded “Symbol” folder in the created “SiC MOSFET” folder.

5. Open the schematic symbol file stored in the “SiC MOSFET” folder with a text editor.

6. Write “SYMATTR ModelFile ONSEMI\ ONSEMI_SiCMOSFET_900_ltspice.txt” in the schematic symbol file opened with a text editor, and overwrite and save it.

( "ONSEMI\~" here should be the folder name created in step 1.)

Do this for your schematic symbol file or any downloaded ONSEMI SiC MOSFET schematic symbol file.

7. Launch LTspice.

8. Open a new schematic editor window and click the “Component” button.

9. Confirm that the downloaded SiC MOSFET model exists, select the model to use, and click "OK".

10. Create a simulation circuit in LTspice's schematic editor and check that the simulation runs.

This completes the import of ONSEMI SiC MOSFETs.

Let's simulate by incorporating the imported SiC MOSFET into the LT8316 sample circuit diagram.

Run the simulation

Replace the power switch M1 STW11NM80 used in this circuit with the SiC MOSFET imported this time.

However, unlike silicon MOSFETs, SiC MOSFETs require a high gate voltage (+18V) and negative voltage (-5V) for the gate drive voltage.
Therefore, add a separate circuit for driving the gate of the SiC MOSFET.

As a result of the circuit simulation, it was confirmed that the circuit works normally.

LTspice demo file verified this time

test_SiCMOSFET.zip

A simulation file using the LT8316 that was performed this time is stored.

This demo file does not include a model of ONSEMI SiC MOSFET, so if you run it as is, you will get an error saying "there is no model".
Please try importing the ONSEMI SiC MOSFET SPICE model introduced this time, and then run the simulation!

At the end

As mentioned above, each company has released a spice model for LTspice, which can be used for easy circuit verification.

In addition, an overview of ONSEMI's SiC MOSFET products introduced this time and other useful information are introduced on the following pages.

https://www.macnica.co.jp/business/semiconductor/manufacturers/onsemi/