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Eighth-brick data centre DC-DC converter delivers up to 1100W

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By Nick Flaherty

Flex Power Modules has launched a series of digital eighth-brick intermediate bus DC-DC converter capable of delivering between 600 to 800W of continuous power along with a peak power of up to 1100W for short periods of under a second.

This ‘burst mode’ operation is commonly required for CPUs (such as Intel’s Ice Lake processor for example) for datacom and data centre applications.

The BMR4920302/861 DC-DC converter is the first of three variants of the BMR492 family to be introduced and delivers a 12V output. Rated to a maximum 600W output over an input voltage range of between 40-60V, the step-down DC-DC converter is used for nominal 48 or 54 V input voltage systems commonly found in data centre server applications. The through-hole mounted device is fully regulated and includes an input to isolation voltage of 1500Vdc.

This BMR492 variant delivers an extremely efficient operation evidenced by a peak efficiency of 96.7 percent at 48 Vin at half load. The output voltage is pre-programmed at 12 V as standard, but this can be adjusted across a wide range of 8 to 13.2 V via the incorporated PMBus interface. This feature is also useful to optimize system level efficiencies through dynamic bus voltage adjustment according to the supplied load.

“The BMR492 delivers a power level that was previously only made possible in a quarter-brick format. The reduction of board area now provided when using this new converter enables our customers to free up space on PCBs for the core technology of their designs rather than for power,” said Olle Hellgren, Director Product Management and Business Development at Flex Power Modules. “For demanding datacom applications, the BMR492 is a versatile power solution in a small package that solves many major design challenges.

The eighth-brick format measures 58.4 x 22.7 x 12.7 mm (2.3 x 0.90 x 0.34 in) with a standard DOSA pinout including the 7-pin digital header for the PMBus interface.

Over-voltage, over-temperature, and short-circuit protection mechanisms help to provide a prolonged operational lifespan with a mean time between failures (MTBF) of 6.64 million hours. Additionally, as with all Flex Power Modules’ DC/DC converters, these units comply with IEC/EN/UL 62368-1 safety standards. The devices offer an operational temperature range of -40°C to +125°C.

The DC-DC converter family is supported by Flex Power Designer software tool.

The BMR492-0302/861 variant is available in OEM quantities from April 2021. Final specifications may be subject to further modification and future variants are expected to be introduced later this year. 

www.flexpowermodules.com 

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