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72V Hybrid DC/DC Reduces Intermediate Bus Converter Size by Up to 50 Percent

Authored on: Jan 1, 2018 by Bruce Haug

Technical Paper / Product Paper

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Until now, most intermediate bus converters (IBCs) needed to provide isolation from input to output with the use of a bulky power transformer. IBCs are commonly used in datacom, telecom, and medical distributed power architectures. A typical IBC has a nominal input voltage of 48V or 54V and produces a lower intermediate voltage between 5V to 12V with an output power from about 50 watts to several hundred watts. However, in many new applications, called "48V Direct", isolation is not necessary in the IBC since the upstream 48V or 54V input is already isolated from the hazardous AC mains. In many applications, a hot swap front end device is required to use a non-isolated IBC. As a result, non-isolated IBCs are being designed into many new applications, which significantly reduce the solution size and cost while also increasing the operating efficiency and providing design flexibility.

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