I’m having trouble getting a spice simulation of a MOSFET LED driver circuit working. I’m using the manufacturer’s spice model of the FET, and I initially suspected the issue was not mapping the KiCAD symbol pinout to the model pinout correctly. However, I’ve tried every permutation of 1,2,3 as the alternate node sequence, and I still get no switching of the FET.
I would attach my eeschema file here, but I don’t have permission for that. Here’s a Google drive link to it, though, along with the spice model I’m using. https://drive.google.com/file/d/1eLkow2idSstImzFHO8_LO_eNhvlb5M0U/view?usp=sharing
Here’s my schematic:
The comments in the spice model for the FET show:
- External Node Designations
- Node 1 → Drain
- Node 2 → Gate
- Node 3 → Source
I think that means that my “alternate node sequence” should be 2,1,3, correct?
Disclaimer: I am very much just hacking my way along with electronics. I’m a mechanical engineer, and electronics are just side projects for fun.