Isolated DC/DC converter helps data centres meet energy efficiency benchmarks

Two variants of Flex Power Modules’ BMR491 series of quarter brick, isolated DC/DC converters are for deployment in next generation data centres aiming to meet increasingly stringent efficiency benchmarks.

The converters include the company’s proprietary hybrid regulated ratio (HRR) technology, developed to extend power capabilities with the efficiency and resilience to voltage transients that would usually be expected from a fixed-ratio converter, says Flex.

The BMR4910204/852 converter is capable of delivering an output power of up to 1300W continuous and has 1850W peak power for a period of up to one second. It supports 97.6 per cent efficiency at 48Vin at half load.

It is supplied in an industry standard low-profile quarter-brick format, measuring 58.4 x 36.8 x 14.5mm (2.30 x 1.45 x 0.57 inch). They have an input voltage range of 48V to 60V. This range is in line with what data centre applications mandate, points out Flex. The BMR4910204/852 can provide up to 160A of output current. Input to output isolation is 1500V.

The second introduction is the BMR4910203/851. It operates over a wider input voltage of 40 to 60V and also delivers up to 1300W of continuous power with 12V over the whole input range. It is a fully regulated version which also allows up to five modules to be paralleled, enabling up to 500A or 6.5kW. Efficiency is 97.4 per cent at 48Vin and half load.

There is also over-voltage, over-temperature and short-circuit protection, to prolong operational lifespan with a mean time between failures (MTBF) of 7.7 million hours.

A baseplate facilitates heat dissipation and there is a 1500V galvanic isolation between the input and output to contribute to safety levels.

Both modules comply with IEC/EN/UL 62368-1 safety standards. The devices offer an operational temperature range of -40 to +125 degrees C.

The BMR491 will be available in OEM quantities before the end of the year (specifications are subject to modification in the interim period, advises Flex).

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