Power Tip 68: Pick the Right Turns Ratio for a Fly-Buck Converter

Sometimes you are faced with a need for a simple, low-power isolated output voltage from a wide-ranging input source. Regulation may not be important, but cost and board area may be. A good solution to these requirements is a Fly-Buck power supply, which is simply a buck regulator with a coupled-winding. Regulation is achieved by rectifying the secondary winding of …