Yes you can simulate that to demo the point.
Those diodes aren’t necessarily only for parallel smps, they can be used with a single smps.
Its just that when an smps goes into no-load, its error amplifier tends to rail low…..the error voltage just plummets all the way down to the rail…..this is a problem when it is subsequently suddenly loaded, because the compensation capacitors then need charging up a lot further in order to get the smps into regulation, so all the diodes do is stop the error amplifier railing in no-load.
So basically it stops the compensation capacitors from charging/discharging too much, then taking too much time to get back into the zone of regulation.
Those diodes are always a good idea, but often people just don’t bother with them, and just tolerate a large vout undershoot following a no-load-to-full-load transient.
Be sure to get the diodes the right way round though
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by the way, parallel smps's that regulate vout need either current sharing circuits, or they must use the same error amplifier for feedback