Politically correct power: it's not sexy but, increasingly, it's the law: if you want to sell your products into a growing number of geographic markets, you have no choice but to be a good power-line citizen. Fortunately, power-semiconductor manufacturers are easing the needed compliance

One of the intended consequences of universal-power-supply designs--those that accommodate inputs from 100V ac or less to 240V ac or more--is that the power-management circuits become source-independent and the designer [...]