1. Forum
  2. Usenet
  3. SCI.ELECTRONICS.DESIGN

  • LTSpice model for a SiC MOSFET

    From Bill Sloman@21:1/5 to All on Sun May 18 18:11:58 2025
    I'm looking at a problem where somebody wants to step down a 1kV low
    current source to 3.3V.

    The Baxandall class-D oscillator could do it, but it needs a pair 1.7kV
    MOSFETs for the job. The Infineon SiC IMH170R450M1 would do it - though
    it's a much higher current part (10A) than the job needs (about 1mA).

    I've dived into the Infineon rabbit-hole which promises LTSpice models,
    but wasn't able to find one.

    Does anybody know of a similar - ideally cheaper and smaller - part for
    which there is an LTSpice model?

    --
    Bill Sloman, Sydney

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From john larkin@21:1/5 to All on Sun May 18 07:15:47 2025
    On Sun, 18 May 2025 18:11:58 +1000, Bill Sloman <bill.sloman@ieee.org>
    wrote:

    I'm looking at a problem where somebody wants to step down a 1kV low
    current source to 3.3V.

    The Baxandall class-D oscillator could do it, but it needs a pair 1.7kV >MOSFETs for the job. The Infineon SiC IMH170R450M1 would do it - though
    it's a much higher current part (10A) than the job needs (about 1mA).

    I've dived into the Infineon rabbit-hole which promises LTSpice models,
    but wasn't able to find one.

    Does anybody know of a similar - ideally cheaper and smaller - part for
    which there is an LTSpice model?

    I use a Cree/Wolfspeed 1200v part, C2M0280120D, in my Pockels Cell
    driver.

    https://www.dropbox.com/scl/fi/5arhyamrp0bl3tgb2fasn/DSC02771.JPG?rlkey=3ttcc2yt6s9nrtdouuv3aneol&raw=1

    They do have an LT Spice model library that works.

    Gate drive for SiC parts is a bear. I did it myself, but I think there
    are chips for that now.

    There are multi-kilovolt silicon mosfets too.

    Baxandal looks to be inefficient and expensive as a low power
    converter. The drain swing is 2x the supply voltage, and it needs two
    fets and a difficult custom transformer.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From legg@21:1/5 to All on Sun May 18 12:12:54 2025
    On Sun, 18 May 2025 18:11:58 +1000, Bill Sloman <bill.sloman@ieee.org>
    wrote:

    I'm looking at a problem where somebody wants to step down a 1kV low
    current source to 3.3V.

    The Baxandall class-D oscillator could do it, but it needs a pair 1.7kV >MOSFETs for the job. The Infineon SiC IMH170R450M1 would do it - though
    it's a much higher current part (10A) than the job needs (about 1mA).

    I've dived into the Infineon rabbit-hole which promises LTSpice models,
    but wasn't able to find one.

    Does anybody know of a similar - ideally cheaper and smaller - part for
    which there is an LTSpice model?

    Ikv, sitting there all alone and bashfull. Not a common occurance.
    Is this the only power source in the vicinity? Tell us more.

    RL

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From legg@21:1/5 to All on Sun May 18 12:03:12 2025
    On Sun, 18 May 2025 18:11:58 +1000, Bill Sloman <bill.sloman@ieee.org>
    wrote:

    I'm looking at a problem where somebody wants to step down a 1kV low
    current source to 3.3V.

    The Baxandall class-D oscillator could do it, but it needs a pair 1.7kV >MOSFETs for the job. The Infineon SiC IMH170R450M1 would do it - though
    it's a much higher current part (10A) than the job needs (about 1mA).

    <snip>

    1mA from the source or into the 3V3 load?

    RL

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)