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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Tue, 20 May 2025 09:38:08 -0400
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"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.
And a drive transformer with two secondary windings for the base current in each.

>
> I found the Infineon INWH170R450M1 part for which I'm now looking for a Spice model with exactly that kind of search string.
>
> I've been jumping through Infineon's support hoops for a couple of days now, and they haven't yet even admitted that they have a 
> Spice model
>
> -- 
> Bill Sloman, Sydney
>
>