Demand for power savings in electronic devices has become increasingly challenging, requiring both high efficiency and a low power consumption at standby. For AC/DC converters, there is a dramatic need for on-board design and further optimization. Dealing with high voltages and often requiring transformer design, developing an AC/DC converter can be a true challenge. The good news is that an increasing number of control ICs has come into play that is able to facilitate the construction of AC/DC converters but needs careful selection.