Step up converter

Flyback Converters for Dummies

http://www.dos4ever.com/flyback/flyback.html

A Half H-Bridge Buck-Boost Converter with high side N-type MOSFET
http://jiggerjuice.info/electronics/projects/power/buck-boost-half-bridge-nmos.html

dc-dc boost converter-mosfet getting damaged

http://www.edaboard.com/thread215886.html

http://www.daycounter.com/LabBook/BoostConverter/Boost-Converter-Equations.phtml