EMC & Efficiency Optimization of High Power DC/DC Converters

ANP049

Choosing the appropriate capacitor technology, storage inductors, switching frequency and semiconductors, among other factors, is vital for the efficiency of DC/DC switching regulators with relatively high input and output currents. A high-efficiency switching regulator is market-ready if it, and the end product in which it is used, comply with all necessary EMC standards. This often means that further appropriate filters must be included at the input and output to reduce emissions of interference. However, with high input and output currents, it is difficult to find a compromise between the efficiency, size, damping and cost of the filter, and the actual performance level. This document will use the example of a 100 W buck-boost DC/DC design to outline the considerations, layout and components necessary to find such a compromise.

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