BMR491 high power quarter brick isolated DC/DC converter variants

16th October 2020
Alex Lynn

Continuing to extend its portfolio of high-density DC/DC converter solutions with built-in digital interfaces, Flex Power Modules has introduced two variants of the new BMR491 series. Aimed at deployment in next generation data centres striving to meet increasingly stringent efficiency benchmarks, these converters include versions that leverage the company’s hybrid regulated ratio (HRR) technology.

Through this, they are able to deliver extended power capabilities together with the efficiency and resilience to voltage transients that would usually be expected from a fixed-ratio converter.

The BMR4910204/852 converter for example is capable of delivering an output power of up to 1300 W continuous and has 1,850W peak power for a period <1s. It supports 97.6% efficiency at 48 Vin at half load. Supplied in an industry standard low-profile quarter-brick format, with 58.4x36.8x14.5mm dimensions, these units have an input voltage range of 48 to 60V (in-line with what data centre applications mandate) and can provide up to 160 A of output current. Input to output isolation is 1,500V.

The second variant, the BMR4910203/851, operates over a wider input voltage of 40 to 60V and again delivers up to 1300 W of continuous power with 12V over the whole input range. However, this fully regulated version also allows paralleling of up to five modules enabling solutions to be created delivering >500 A or 6.5kW. Efficiency is 97.4% at 48 Vin and half load.

Sophisticated over-voltage, over-temperature and short-circuit protection mechanisms deliver a prolonged operational lifespan with a mean time between failures (MTBF) of 7.7 million hours.

Incorporation of a baseplate facilitates heat dissipation, while 1500V galvanic isolation between the input and output assures elevated degrees of safety. 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 to +125°C.

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