I have done DC converters before, both the curious way (AVRing it) and the lazy engineer's way (applying a datasheet formula) but it was always from nice DC sources with a fairly big filter cap.
Now, just for the reason of size, I'd like to go with a much smaller filter cap on the input, so the DC will have much ripple on it. I imagine this is going to muddle common buck-converter designs.
I'm looking for advice from people who did such a stunt before. What to look for to select a buck converter chip which behaves tame in such a situation?
EDIT: I found it's worth to note, these are many tiny boards needing +5V, and supplied 24VAC from a central distribution.