mij59, do you mean the efficiency? That looks not very high at all indeed. 280/100 -> 35.7% efficiency, that's bad. I guess it's better at higher loads but this is not what I need. The suggested LMR62014 appears at be better at 70-80% efficiency at the 15mA-100mA loads that I need (see 'LOAD (mA)' specs on page 6). Do you know any already soldered dc-dc converters that would fit better my needs?
blueskull, my was almost 3 times cheaper including shipping. I wouldn't pay 120$ for it indeed. I choose to get this for my PMTs (=photomultipliers) because it's designed for them, by the same manufacturer. It has protection features, is low ripple/noise and saves me a lot of time when I would have bought the individual parts myself and done the work. Of course this has its disadvantages as it's more expensive, less repairable and I learn less. But I wanted this to get working first. If you have schematics for building such a PMT supply, maybe as a kit to buy from somewhere, you may please post it, I'm certainly going to build it because as you can see in the picture there are 3 PMTs, so I need a HV supply for the other 2.