This replicate the boost example in the youtube video. I took @ivan1 circuit and modified that with parameters (Ron=1m instead of 100m) closer to LTspice example in the youtube example. I believe what make people uncomfortable is the repeated oscillation when simulation run into steady state.
I discussed this boost example with Mike Engelhardt. My study suggests the problem is related to simulation timestep profile in running this example. In general, it is not a common situation you run into as this is a lengthy setup (run up to 4s). Default Qspice setting seems not handle this example well. To run this example with a result similar to LTspice, Mike suggests to set .option trtol2=0
Hope this can settle your concern.
boost-trtol2.qsch (5.8 KB)
