How can I achieve an isolated power supply with 12 to 15V dc input, 12V dc output @0.6W or 50mA?

The LM2585-12 flyback regulator should be able to satisfy your power requirement. There is an application note available, AN-1095, which provides design guidelines about building an isolated power supply using the LM2587 (the same family as the LM2585). Feedback voltage for controlling the duty cycle of the regulator to maintain its output constant is through an opto-isolator.

The appnote makes mention of the Switchers Made Simple software which is used to design the circuit (less the feedback loop). This software is also part of WEBENCH, National''s on-line design tool set. Either tool can be used to design your flyback circuit.

More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.