Re: LTSpice model for a SiC MOSFET

On 19/05/2025 10:48 pm, legg wrote:

On Mon, 19 May 2025 18:27:01 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
 

On 19/05/2025 2:12 am, legg 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?

>
1kv, sitting there all alone and bashfull. Not a common occurEnce.
Is this the only power source in the vicinity? Tell us more.

>
It's not my project. I just got asked about what a Baxandall
down-converter for a 1kV 10uA source would look like.
>
Because it's not my project I'm not at liberty to talk about the power
source. My first thought was an intensely radio-active source pushing
out a lot of high energy beta rays (electrons) or alpha rays (helium
nuclei), but it isn't.
>
>

It sort of limits your ability to help.

I know what the power source is - in general terms. I haven't got any kind of okay to talk about it

At 1W, you should be able to get away with murder, if efficiency
isn't really an issue.

Efficiency is an issue, if only on the sense that a 0.1W power source isn't up to much, so even 50% efficiency would be nice. Jim Williams got about 93% out of the Baxandall configuration, but 50% might be good enough.
Bill Sloman, Sydney