gnetlist -v -g spice-sdb -obuck.net buck.sch ngspice source buck.net tran 0.001us 0.25ms plot nout ndiode nin Vind#branch Vcap#branch
gnucap get buck.net print tran v(*) i(*) tran 0.25ms 0.25ms trace all >z !gwave z &then drag the signals you want onto the gwave canvas.
Things to try
The buck-math script generates ideal values for the inductor and capacitor based on the load and vin/vout parameters. What happens is you use a smaller inductor? A smaller capacitor?
The inductor value is a minimum. Try one ten times bigger. Add a PWL/switch/resistor to the load to simulate a step load. What happens to the load response time?
The current through the inductor falls nearly to zero, or even hits zero depending on the vin/vout ratio. What can you do to keep it from falling to zero?
What changes if you change the frequency? What doesn't change?
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