Simple High Voltage Power Supply Circuit
There's a Design Idea in EDN magazine that uses just one IC in a simple, high voltage power supply. See the June 26, 2008 issue. It's a fixed output supply with limited adjustment capability. If you need a small, inexpensive power supply, this is a good possibility.
The output voltage can be increased by adding more secondaries, and stacking them up, as in the design as shown.
The regulation is not great, but if that is all you need, then that is ok. However, if you prefer better regulation, and if you don't need a floating output, then the circuit would work better if the voltage feedback was taken from the output (with a voltage divider) rather than from a separate secondary winding.
You can find the article at http://www.edn.com/article/CA6571003.html