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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Wed, 21 May 2025 11:43:14 -0400
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"john larkin" <jl@glen--canyon.com> wrote in message news:8osr2klq9oepgqsva13nljp4aikmh75rkv@4ax.com...
> On Wed, 21 May 2025 09:42:11 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:100jsf2$2n1hq$2@dont-email.me...
>>> On 21/05/2025 3:44 am, Edward Rawde wrote:
>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:100ibpi$2at8a$2@dont-email.me...
>>>>> On 20/05/2025 11:38 pm, Edward Rawde wrote:
>>>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:100hb9s$24itl$3@dont-email.me...
>>>>>>> On 20/05/2025 4:26 am, Edward Rawde wrote:
>>>>>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:100epio$1h4ca$1@dont-email.me...
>>>>>>>>> On 19/05/2025 1:38 pm, john larkin wrote:
>>>>>>>>>> On Mon, 19 May 2025 12:23:54 +1000, Bill Sloman <bill.sloman@ieee.org>
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> On 19/05/2025 12:15 am, john larkin wrote:
>>>>>>>>>>>> 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.
>>>>>>>>>>>
>>>>>>>>>>> It isn't going to be inefficient. That configuration is famous efficient.
>>>>>>>>>>>
>>>>>>>>>>> The drain swing is actually 1.67 times the supply voltage, but it does
>>>>>>>>>>> need two switching devices and a specially wound transformer (and we
>>>>>>>>>>> know how reluctant you are to design them or get them made).
>>>>>>>>>>>
>>>>>>>>>>> It is probably going to be too expensive for the application, and we'd
>>>>>>>>>>> be grateful for your insights into a cheaper alternative. I can't think
>>>>>>>>>>> of one.
>>>>>>>>>>
>>>>>>>>>> I'm not sure what the specs are, but I have a few ideas.
>>>>>>>>>>
>>>>>>>>>> One could make a flyback converter with a high-ratio transformer.
>>>>>>>>>> Coilcraft makes some, capacitor charging transformers and CCFLs. There
>>>>>>>>>> must be crazy cheap Indian or Chinese CCFL transformers.
>>>>>>>>>>
>>>>>>>>>> ST makes a 1400v NPN transistor for under a dollar.
>>>>>>>>>
>>>>>>>>> But you can't be bothered to post the part number.
>>>>>>>>
>>>>>>>> What you should have said is that you couldn't be bothered to use a search engine.
>>>>>>>
>>>>>>> I need at least 1.7kV. A 1400V part isn't interesting.
>>>>>>
>>>>>> Centuries ago they'd put two transistors in series in the TV horizontal deflection department because a single one didn't 
>>>>>> have
>>>>>> enough Vce max.
>>>>>
>>>>> The transistor was invented in the 1950's. Decades ago is closer to the mark.
>>>>
>>>> LOL sane people would have known what I meant without needing to point that out Bill.
>>>
>>> Sane people don't say "centuries" when they mean "decades".
>>
>>Does the word "hyperbole" mean anything to you Bill?
>
> He's obviously unwell.

Yes I think you're right so I'm going to leave it there.

>