If you really want to learn about high speed switching power supplies, get Fundamentals of Power Electronics by Bob Erikson and Dragan Macksimovic. Or you can skim over their lecture notes which are very nice PDFs that summarize each chapter in the book.
http://ece.colorado.edu/~ecen5797/notes.html (PWM Switching Converters)
http://ece.colorado.edu/~ecen5807/lectures.html (Modeling and Control)
http://ece.colorado.edu/~ecen5817/schedule.html (Resonant converters)
Heres a link to a copy amazon.com sells, but I must warn you that this version has many typos as its the first edition, and the second edition was released almost 2 years ago.
http://www.amazon.com/gp/product/041208.../002-3529841-2705661?v=glance&n=283155
This was my power textbook when I took Power Electronics Theory from Dragan. However, I found out later that many many people in industry use this book as a general reference, and I must say its quite comprehensive in discussing everything from design, to implementation and analysis of all switching power converters (DC/DC,AC/AC, AC/DC, DC/AC and even Resonant converters) If your curious, or really interested, this book is awesome, and the only textbook I can see using frequently at my jobs in the future.
This morning I was actually finishing up my Power Lab final project, taking a 120V AC line input, using a DCM Flyback Transformer and outputting 12V converter with a peak power of around 80W (closed loop compensator regulated). It may go higher, but I dont like things blowing up, plus with a hand-wound transformer, leakage inductance is a serious issue. Building a switching transformer like this is no small feat I must say, and due to what turned out to be snubber/transformer design flaws, we ended up nuking about 6 diode bridges, 10 fuses, 18 mosfets and 15 power diodes. But now I learned my lesson
p.s. Power diodes become shorts when they nuke, and most normal diodes become open circuits when they explode. Power diodes breaking is a good way to blow fuses.