Power supply design, even the design of common DC to DC switching converters can present a number of challenges; this is especially true with higher power designs. Beyond the functional issues, an engineer must make sure the design is robust, meets the required cost targets and thermal and space constraints all while staying on schedule. Additionally, and hopefully not as an afterthought, the design must produce sufficiently low Electromagnetic Interference (EMI) both for reasons of product compliance and system performance. However, a power supply’s EMI level is one of the more difficult aspects of the design to accurately predict. Some might even argue that it’s simply impossible and the best a designer can do is take sufficient care in the design, especially in the layout.