Re: LTSpice model for a SiC MOSFET

On 21/05/2025 12:04 am, john larkin wrote:

On Mon, 19 May 2025 09:33:28 -0400, legg <legg@nospam.magma.ca> wrote:

>
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'd keep it simple and repurpose a backwards commodity CCFL ($0.50)
transformer, in a low frequency (20-50KHz) buck regulator 'of sorts'.

 A ccfl transformer is ideal for the HV step-down application, and dirt
cheap is a side benefit.
 They often have several windings, which helps build oscillators. More
details might involve using a search engine.

It's not the sort of component that a search engine will find for you.
A manufacturer and a part number would be helpful.
<snip>

I'd expect that the transformer and one transistor and a few passives would
make a basic step-down converter without low-side logic to power up.
Parts cost could get below $3 for a regulated 1K to 3.3 supply, $2 in
quantity.

So post an LTSpice simulation - an .asc file rather than some screen shot. That way we can run the simulation for long enough to see that it really does settle down, rather than just looking okay at some point during start-up.
--
Bill Sloman, Sydney