Kumar:
That's a bit vague. I mean, what are your constraints...what is it for...etc. That's a BIG range (90-275), though not a lot of power. For an "easy" solution, I'd recommend doing something like a switchable doubler vs. full wave bridge on the front end to deal with the wide input range, a bank of caps for clean-up, then a two output buck converter. The ccts are pretty easy to come by (recommend picking up the SMPS books by Billings and/or Pressman...it won't take you too much to spin something basic together that'd work.)
Regards,
haz1