DC/DC converters deliver up to 1,100W power capability

28th January 2021

Flex

Lanna Deamer

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Flex Power Modules has announced the launch of the BMR492 - a series of digital eighth-brick intermediate bus converters capable of delivering between 600 to 800W of continuous power along with a peak power of up to 1,100W for short periods less than 1s. This so-called ‘burst mode’ operation is commonly required for CPUs (such as Intel’s Ice Lake processor for example) for datacom and data centre applications.

The new BMR4920302/861 converter, the first of three variants of the BMR492 family to be introduced, delivers a 12V output. Rated to a maximum 600W output over an input voltage range of between 40-60V, the DC/DC step-down solution is suitable for nominal 48 or 54V 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 1,500Vdc.

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

Supplied in an industry-standard eighth-brick format with 58.4x22.7x12.7mm (2.3 x 0.90 x 0.34 in) dimensions, the baseplated converters have a standard DOSA pinout including the 7-pin digital header for the PMBus interface.

Sophisticated 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 solution is fully supported by Flex Power Designer, the design software tool freely available to download from the Flex Power Designer website.

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