Flex Power Modules increases quarter brick’s continuous power to 1300W 

Digital quarter brick DC/DC converters from Flex Power Modules have an increased power rating to 1300W continuous and 1700W peak.

Enhancements to the BMR350 non-isolated, quarter brick DC/DC bus converter have resulted in the BMR350 x250/531. The increased continuous power rating has been increased from 860 to 1300W, with a peak power capability of 1700W.

The footprint of 58.4 x 36.8mm and a height of 12mm have been maintained as has the input range of 40 to 60V DC (80V / 100ms). Output is set at nominal 12.12V DC, now rated at 108A continuous and 170A peak. Output is adjustable from 8.0 to 13.2V. The company has added an additional bottom side cooling plate and doubled the output connector pins to achieve the increased rating.

The BMR350 x250/531 can be used as an intermediate bus converter for powering processors and ASICs with high peak power demands, advised Flex Power Modules. It features a transformer-coupled, non-isolated topology which reduces component count and current stress. Efficiency level peaks at 97.7 per cent at 54V input. 

Flex Power Modules 3D thermal data graphs specify available output power for given real world pin and baseplate temperatures. This enables maximum power to be extracted without stress to the converter. Active current sharing between paralleled modules is also available for even higher power levels.

The BMR350 x250/531 meets EMI standard EN 55032/FCC part 15J ‘Class B’ when used with a recommended external filter.

Full protection is included against output over-voltage, over-current and module over-temperature, and a PMBus interface provides remote control and monitoring, supported by the Flex Power Designer software tool. An event data recorder can be interrogated even after a converter shutdown to analyse specific stresses or fault conditions.

Terminations are via through hole pins which are suitable for pin-in-paste reflow, wave or manual soldering.

The BMR350 variant will be available in OEM quantities in May 2022. 


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