Quarter-brick DC/DC converter boosts power rating

Flex Power Modules has released an enhanced version of its BMR350 non-isolated quarter-brick DC/DC bus converter. With the new BMR350 x250/531 DC/DC converter, the continuous power rating is increased from 860 W to 1300 W, with a peak power capability of 1700 W.

Flex Power Modules attributes the increased rating to an additional bottom side cooling plate along with doubling up the output connector pins.

Quarter-brick DC/DC converter boosts power ratingLike the original BMR350, the new device is housed in the same footprint, measuring 58.4 × 36.8 × 12 mm, and offers the same input range of 40-60 VDC (80 V/100 ms). Output is set at nominal 12.12 VDC, now rated at 108 A continuous (170 A peak), and is adjustable from 8 V to 13.2 V.

The BMR350 x250/531 DC/DC converter is suited as an intermediate bus converter for powering processors and ASICs with high peak power demands. Features include a transformer-coupled, non-isolated topology, which reduces component count and current stress and delivers an efficiency level peaking at 97.7% at 54-V input, said the company.

Derating for the product is characterized by Flex Power Modules’ 3D thermal data graphs that specify available output power for given real-world pin and baseplate temperatures. Active current sharing is available to support paralleled modules for higher power levels.

The BMR350 x250/531 meets EMI standard EN 55032/FCC part 15J ‘Class B’ when used with a recommended external filter. The DC/DC converter includes protection against output over-Voltage, over-current, and module over-temperature.

A PMBus interface provides remote control and monitoring, supported by the Flex Power Designer software tool. A key feature is an ‘event data recorder’ that can be interrogated even after a converter shutdown for analysis of any specific stress or fault conditions. The new BMR350 variant will be available in OEM quantities in May 2022.

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