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Second-generation direct conversion DC/DC converters for data centres

Flex Power Modules has introduced the BMR482, its second generation of direct conversion isolated DC/DC converter.

By converting directly from a 48 V supply to the load voltage without an intermediate stage, the BMR482 delivers increased efficiency in a more compact package, enabling it to meet the higher power needs of modern data centres and cloud computing.

The BMR482 is able to achieve up to 91.3% efficiency with a 0.8 V output at 53 Vin, which is 2 to 3% better than an equivalent solution based on an intermediate bus converter (IBC) and point of load (PoL). The single-stage BMR482 also requires up to 50% less board space than a conventional two-stage solution, helping reduce costs.

The converter is available as a ‘main unit’, measuring just 30 x 12.7 x 16.8 mm, which includes a digital interface for monitoring, configuration and control, and can deliver a maximum output current of 110 A. If a higher output current is required, up to five ‘satellite’ modules can be added, measuring 30 x 12.7 x 15.4 mm each, to provide a maximum total output current of 660 A. These are automatically enabled and disabled by the main unit depending on the output current drawn, meaning efficiency is optimized across the entire current range dynamically.

Designed for server applications, the BMR482 has an input range of 40-60 V, enabling it to operate with supplies nominally rated at 48 V or 54 V. It has a programmable 0.5-1.35 V output voltage, and the main power train has 1500V isolation from input to output.

The BMR482 is compliant with the PMBus v1.3, AVSBus and Intel SVID interfaces, offering complete digital control. It is supported by the Flex Power Designer software tool.

Author
Neil Tyler

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