What is the best strategy to minimize EMI?
There is no one perfect EMI strategy for all applications, but some basic thought before-hand can make the task much easier. The first step is to make sure that the location of components minimizes noise. For example, de-coupling capacitors should be located as close as possible to the converter, especially X-caps and Y-caps. Use ground planes to minimize radiated coupling, minimize the cross sectional area of sensitive nodes, minimize the cross sectional area of high current nodes that may radiate such as those from common mode capacitors. The location of the EMI components is critical; avoid placing the converter in close proximity to your filter to avoid noise coupling back into the filter. Keep in mind that you are not just filtering the power supply, but all the circuitry that the converter is powering as well. Most of today’s communication cabinets employ as much local filtering as possible at the card level, and then another filter at the power entry module, where the power feed
