Re: LTSpice model for a SiC MOSFET

On 26/05/2025 4:20 am, JM 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:

The drain swing is actually 1.67 times the supply voltage, but it does

 Where does 1.67 come from?

Integrate a series of half-sine peaks that get to 1.67V and the voltage averages to about 1V.
You can do it as purely mathematical exercise, and I did it years ago, and that's roughly the result I got.
There's a voltage drop across the switching FET that's on and the Baxandall circuit doesn't product perfect half-sine waves, so it hasn't got a lot to do with precise reality, but it's good enough for preliminary design.
If senile dementia hasn't set in too far I could probably do it again.
--
Bill Sloman, Sydney