Hi, all,
I have a measurement application (finding blood spots in hen's eggs) for which I need to pulse a 20W white LED at a couple of kilohertz. No problem there.
Thing is, it needs about 28 V at 700 mA, and the available supply is only 24 V.
So there are a few ways of slicing this. The two most obvious ones are (a) a boost converter to make +30, and (b) an inverter to make -6. The control is going to be optoisolated, so there's no real difference in the driver complexity.
The inductor waveform is going to be basically the same in both instances, ISTM, so it's really the available regulator chips that are relevant.
The whole thing will be in a metal box by itself, so I don't much care about it talking to the rest of my circuitry, but I do care about passing EMC. (The customer is doing the layout, so it's his headache, but I'd like to make it easier if possible.) Environment is benign--the eggs have to survive!
Suggestions?
Thanks
Phil Hobbs