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The message:
| Timestep too small |
is not actually due to non-convergence. It means that, because of the nature of your circuit, to achieve the required accuracy, a time step smaller than the minimum permissible was needed. This can happen if you perform a very long transient analysis on a circuit with relatively short time constants. If you get this message, you can try reducing the minimum time step with the MinTimeStep simulator option. The default value for MinTimeStep is 1e-9*max time step and the max time step defaults to (Tstop-Tstart)/50 where Tstop and Tstart are respectively the stop and start times of the transient analysis. This option can be set in the user interface. See User's Manual/Analysis Modes/Transient Analysis/Setting up a Transient Analysis/Time Step.
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