Warning: Singular matrix. Check node N09 Added gshunt=1e-13

macsky · February 15, 2024, 12:22pm

How to solve this warning? anyone can help?

Thanks,
Mac

physicboy · February 15, 2024, 12:24pm

Just connect that yellow trace to gnd

macsky · February 15, 2024, 12:30pm

Nice… solved. Thank you.

physicboy · February 15, 2024, 1:13pm

this is how I made my schematic

more detail here QSPICE/PWM_example_SRbuck at main · physicboy/QSPICE · GitHub

KSKelvin · February 15, 2024, 1:58pm

Singular matrix warning can commonly occur when a node is floating (i.e. no path to GND). + and - pins of Switch is isolated and that why with - pin connect to Gnd you can resolve this problem.