I'm designing a regulator/converter that can generate -120/-108/+60Vdc for a current of 180mA each from a supply of 12Vdc or 24Vdc (5A like it's nothing, 15A tops) and I was choosing a MC34063 but the absolute maximum rating for Vout is 40Vdc:
- Is it sane to overspec for 300%? In the datasheet there is a circuit for use with external transistors, but I really know little of supply design.
- Is there another ubiquitous IC for doing this? (I googled it and all that I can find are car inverters)
EDIT: the three separate rails can be independently regulated
EDIT: for the record there is a circuit called the Villard cascade that works for very low currents (like the CRT screens), but it was too dangerous to prototype (by me).
Final Update I found a full LED replacement for the screen I was planning to supply and for the old ones we salvaged supplies from older equipment.