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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Tue, 20 May 2025 18:46:30 +1000
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On 20/05/2025 1:13 am, Liz Tuddenham wrote:
> 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?
> 
> How about a piezoelectric transformer run in reverse?

The piezoelectric transformer is an interesting idea.

> Neon tubes illuminating a solar cell? 

Neither is all that efficient.

> Capacitive divider using a spare core in the
> mains supply lead as one plate of the capacitor?  (Depending on supply
> frequency and required output current.)

I can't see how that could work. Charging up lots of capacitor is 
series, and discharging them in parallel is one mode of current 
multiplication, but about the only kind of switch that would work would 
be a reed relay, and they are slow and don't last long when cycled fast.

Dry reeds are good for 10 million closures, mercury-wetted reeds for 
about 100 million, and neither is all that cheap or compact.

-- 
Bill Sloman, Sydney