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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 09:42:11 -0400
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"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?
A search engine should help.
I don't mean (x^2)/(a^2)-(y^2)/(b^2)=1

>
>> In any case there was no transistor capable of doing horizontal deflection and EHT  for a 20 or more inch CRT before the late 
>> 60s.
>> My father was never without a spare PL36.
>
> So what.
>
> <snip>
>
> -- 
> Bill Sloman, Sydney
>
>