Direct conversion DC/DC converter for data centers

June 09, 2021 // By Jean-Pierre Joosting
Direct conversion DC/DC converter for data centers
Second generation 48V-to-load direct conversion technology delivers up to 91.3% efficiency and cuts board space requirements up to 50 percent.

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 compact package, enabling it to meet the higher power needs of today’s data centers and cloud computing.

The BMR482 can achieve up to 91.3% efficiency with a 0.8 V output at 53 Vin, which is 2 to 3% better than an equivalent product 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 product, helping reduce overall costs.

The new 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 1500 V isolation from input to output.


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