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RE: what do you look for in the graphs?

Those are broad questions.

I assume the reason you are simming the supply is to predict the voltage and ripple?

Those are shown in the graph when you have V(C[last cap]) checked.

If your supply is cap input then you might also look at the charging currents to the first cap, I(C1).

The higher the first cap's value, the higher the charging current and the shorter the "on" time for each diode. This is also shown on the graph.

Also look at the diode "peak current" I(D1). Also shown on the graph.

Make sure the peak repetitive current rating (IFRM) of the rectifier tube is not exceeded.

With the step response you can see if the supply is ringing.

That is shown on the graph (with V(C[last cap]) checked) by the voltage "bouncing" up and down several times before settling down after the current "step".

A smooth "ski slope" (without the bouncing) shows a non-ringing behavior of the supply.

If you set the sim to run for 20 seconds after a reporting delay of 6 seconds and set the current step to increase the current by 10 or 20% after 8 seconds then you get a clean graph without things "running into" each other.

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 05/28/17 05/28/17 05/28/17

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