LTspice sim not working "time step too small"

[Flyback]

Hi,
Does anyone know why the attached sim wont work?
It gives "time step too small error", but the U1, to which it refers , looks well connected.

 

[Tony Stewart]

When time step is too small and time lapse is 20ms , it might exceed buffer or cache limits or something in LTspice. Use 2ms or 5ms stop time which works.

 

[alec_t]

the U1, to which it refers , looks well connected.

I've sometimes found that tinkering with some other component than the one LTS points to effects a cure. Capacitors and inductors sometimes benefit from an internal parasitic parameter being set.

 

[Papabravo]

This also happens when the simulation creates derivatives with very steep slopes. As it tries to make the time step small enough to provide for such a slope it reaches a limit. There are no simple or easy - works every time solutions. The process of elimination is about the only thing that works.

 

[Tony Stewart]

Your circuit lacks phase compensation which due to lack of phase margin causes oscillations on start-up, which is easily fixed, but the no-load noise seems excessive for the values chosen after the output reaches target.
My simulation added a 0.2 ohm load.