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I'm pretty new to SMPS.I am trying to design a boost converter using the UC3845. I want to step up from 19V (e.g. laptop PSU, but currently using a bench power supply) to about 250V. It would be nice to get 50mA out of it, but I would settle for less. I have a circuit that is sort of...

I posted a thread in the amplifiers section,but it looks like no one goes there, so here's a new thread and questions! I'm trying to drive an old ATX PSU transformer backwards to get a high voltage (like 150Vdc at 100ma if I'm lucky). I'm driving the old 12-0-12 secondary with a push-pull 12V...

I have a hankering to make a high-voltage SMPS, but I want to avoid having to wind my own transformer. I have been looking at some old off-line ATX power supplies, and they all seem to use a half-bridge to step down half the supply voltage (about 300Vdc where I live) to +/-12V etc. I think the...