Wolfspeed Power Applications Forum

Wolfspeed Technical Community:

Characterization of parasitic capacitances of CAS300M12BM2 module

augarte
augarte Contributor Level 1
edited February 2023 in Module Products

Hi,

I am trying to model the CAS300M12BM2 SiC MOSFET module taking into account the voltage-dependant behaviour of the parasitic capacitances in order to reach a Matlab/Simulink simulation as close as possible to reality, so proper total charge gate and turning on/off dynamics are obtained.

To do so, I wonder if you could provide me the following data, which seems to have a noticeable impact in the accuracy of the dynamical behavior, according to some consulted works and papers:

· Vdg vs Cdg at negative Vdg values, that is when the MOSFET is fully turned on.

· Vgs vs Cgs. When obtaining Cgs from the capacitances provided on the datasheet, it is inferred that Cgs is almost constant on the whole Vds range, but as far as I know it does vary a bit depending on the applied Vgs voltage.

Thank you in advance

Tagged:

Comments

  • BlakeNelson
    BlakeNelson Wolfspeed Employee - Contributor Level 2

    Hi augarte,

    I agree that Cgs(Vgs) and Cdg(-Vdg) are important parameters for accurate dynamic models. As I understand it, any academic work using such measurements characterize these parameters themselves as no manufacturers (that I am aware of) provide it in their datasheets. We are looking into characterizing these parameters on a wider scale for future modules, but at this time we only have a narrow selection of this data and do not plan to add it to our datasheets.

    As a matter of chance, I do have Cgs(Vgs) data for the CAS300M12BM2 module.

    This data was collected by an academic partner, and is based on a single module. It may not be representative of all CAS300M12BM2 modules.

    From what I understand, while having data for both Cgs(Vgs) and Cdg(-Vdg) is ideal, using Cgs(Vgs) is a major improvement over C(Vds) alone. If you still need Cdg(-Vdg), you will have to collect it yourself as we can't support new characterization efforts for products not recommended for new designs.

    Thanks,

    Blake

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5

    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.

This discussion has been closed.