Related to a previous thread, I found this link:

<http://www.powerint.com/PDFFiles/di30.pdf>

It's a complete design for a 180W offline smpsu using a switcher from 
power integration. Includes transformer winding data, testing methods 
including scope probe preparation for ripple measurement and thermal data, 
full parts list, pc board, transient load testing. But no calculus sheet.

Peter
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