Hi there - at work I'm probably going to have to design a high voltage DC/DC converter sometime in the near future. It looks like it'll be something along the lines of 5V input and 250V output. Current will be under 10ma. Probably more like 1-2ma. The more regulated the better, but I will probably just regulate it down a bit with a FET to clean it up.
My understanding is that once you start to get to something like an output voltage 10x or more of the input voltage the standard boost circuit (cap + diode + inductor) no longer really cuts it. Instead, I've read that step-up transformers are a better way to go. However, when I look through Digi-Key, all I see are step down transformers for stepping down wall power, as well as various specialty transformers.
Any suggestions? Thanks!