Request for the Details and Spice model of SiC power module (CAS325M12HM2 and TH-3231-R).

Luowei

I am using SiC power modules (CAS325M12HM2 and TH-3231-R) separately for an EV traction inverter.

I want to ask the following questions:

1. Do you have the spice model for these two modules, especially CAS325M12HM2, that I can use in LTspice model or any solution to generate it with the other available spice models?
2. Any cross-talk consideration for them? Now I am using -5 and +20V to drive. I am considering how low the negative gate voltage can go and the limitations for the power modules.
3. Short-circuit consideration, how long the power module can handle the short circuit conditions and how much energy it can bear in a short period of time.

Feel free to ask any questions and give me any comments.

Best regards,

Luowei Wen

TBhatia

Hello, thank you for your message. A member of our technical team is looking into your questions and we will respond shortly.

BlakeNelson

Hi Luowei,

I am not sure what product you are referring to as "TH-3231-R." If you could provide me some more context, I'll do my best to offer some assistance.

As for the CAS325M12HM2, the product is obsolete, so while I would recommend you take a look at its replacement (CAS480M12HM3), I will do my to answer your questions.

1. SPICE Model: as this is an obsolete product, we CAS325M12HM2only have a very old models which is not up to our current standards. This model's prediction of circuit dynamics may not be accurate. Perhaps it could at least offer some high level guidance (e.g. parasitic values). We won't be able to provide any new / better models for this product.

CAS325M12HM2_SPICE_Model_Rev1.0.zip

2. Cross-talk considerations: I recognize that there may be advantages to using a gate drive voltage below the recommended -5 V. In fact, for transients, the die has a minimum voltage of -10 V (but this should be left as headroom for undershoots due to ringing). I would not recommend using a drive voltage below -5 V however, as there will be reliability concerns such as gate oxide failure and Vth shift. I do not have relevant reliability data for this product to guide you on the specific risks, but my general expectation for EV traction is that reliability is a critical concern (and therefore you should stick to the recommended value). Perhaps you could address issues through other strategies (e.g. common mode chokes, higher quality isolated gate drive PSU, etc).

3. Short circuit withstand energy: While I don't have a full dataset to answer your question properly, I do have a test report from some short circuit testing conducted a few years ago. It's a small sample size, but based on it, the withstand energy seems to be greater than 100 mJ.

CAS325M12HM2 Short Circuit Test Summary.pdf

I've attached the report in case it is beneficial to you.

Hopefully that information is helpful!

Blake

TBhatia

Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.