PI Expert is an interactive program that takes a user's power supply specifications and automatically determines the components needed to generate a working switch mode power supply. This program can also optimize designs for cost and efficiency while it dramatically reduces design time. As shown in the slide, the new PI-XLS “LinkSwitch-II Flyback Design” file type displays data in a spreadsheet which allows parameters to be easily adjusted. For example, if the maximum computed duty cycle exceeds 55% the input capacitance can be increased by simply entering a new value.