doAnalyses: TRAN: Timestep too small; initial timepoint: trouble with node "probe_int_probe_int_net-_u1-_on/off__xu1_5_xu1_5" run simulation(s) aborted

Schematic Simulation (Ngspice)
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I want to sim this ckt but having error “Timestep too small”

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https://forum.kicad.info/search?context=topic&context_id=60685&q=Timestep%20too%20small&skip_context=true

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For switched power electronics applications, I usually have to adjust some of the simulations options:

.options method=gear chgtol=1e-11 abstol=1u reltol=0.01 rshunt=1G rseries=0.05 cshunt=1p trtol=1

It’s helpful to look them up in the ngspice manual so you have an idea what you are changing there. Also consider to add a load to the output.

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Have you carefully inspected your circuit? I’m not sure it should work, regardless of the simulation system. (Check the power symbols, and the on/off and probably everything else including diode models)