DC-DC Converter - SYNC pin from EMC perspective
Among the engineering challenges and trade-offs, beside the technical ones, there is always the system cost. The main design goal is typically to achieve what the marketing department asks for, with the minimal cost. This will enable a cheaper product and would allow a better revenue margin by selling the product in the market. The SYNC pin is a typical feature offered by high current DC-DC converters (typically from 2A and higher) that enables reducing the size of the input capacitance in case multiple DC-DC converters are required. The article will introduce how and why the SYNC feature is used, and which benefit may bring also from the EMC perspective.
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