1.5kW quarter brick isolated DC-DC converter for data centres

December 09, 2020 // By Nick Flaherty
1.5kW quarter brick isolated DC-DC converter for data centres
The 1.5kW BMR491 DC-DC converter provides a peak power up to 2450W for 1s for data centre applications

Highlighting the increased power requirements of data centre applications, Flex Power Modules has launched a quarter brick DC-DC converter with digital control that delivers a peak power of 2450W.

The BMR491 DC-DC converter can deliver 2450 W peak power for periods of up to one second, with a continuous output power rating of up to 1540W. Flex says this makes it the highest power density digital isolated DC-DC isolated converter available today.

A digital interface is available in either 4 or 7-pin DOSA standard and the BMR491 is supported by the Flex Power Designer software tool.

The unit operates over an input voltage range of 48 V to 60 V and delivers a nominal 12 V output, making it suitable for data centre applications. Efficiency is 97.5 percent at 48 Vin at half load, and the BMR491 can provide output current of up to 205 A.

The converter is supplied in an industry standard low-profile quarter-brick format, measuring 58.4 x 36.8 x 14 mm (2.30 x 1.45 x 0.55 in) with baseplate, and is also available with an integrated heatsink with a height profile of 19 mm. The converter has an operational temperature range of -40°C to +125°C.

The digital DC-DC converter uses Flex Power Modules’ proprietary hybrid regulated ratio (HRR) technology, which enables it to deliver extended power capabilities, as well as the efficiency and resilience to voltage transients that would more commonly be expected from a fixed-ratio converter.

Operating lifespan is increased through the inclusion of advanced over-voltage, over-temperature and short-circuit protection mechanisms, and mean time between failures (MTBF) is over 7 million hours. Heat dissipation is helped by the inclusion of a baseplate and the use of enhanced thermal conduction techniques, with an integrated heatsink option also being available.

As with all the Flex DC-DC converters, the new device complies with IEC/EN/UL 62368-1 safety standards. Input to output isolation is 1500 V.

The BMR491 will be available in OEM quantities in the first


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