• The uninsulated design allows lower $ / W
  • High peak efficiency and full load efficiency
  • Fully regulated output
  • Digital control interface with “event data recorder” and active power sharing

Flex Power Modules has introduced an improved version of its popular BMR350 uninsulated DC / DC quarter-brick bus converter, BMR350 x250 / 531. The constant power has been increased from 860 W to 1300 W, with the possibility of a peak power of 1700 W.

The product supports the same footprint of 58.4 mm x 36.8 mm and a height of only 12 mm and has the same input range of 40-60 VDC (80 V / 100 ms). The output is set to a nominal 12.12 VDC, now rated at 108 A continuously (170 A peak) and is adjustable from 8 V to 13.2 V. The increased rating is allowed by an additional cooling plate on the bottom along with doubling the pins of the output connector.

As with the original BMR350, the product is ideal as an intermediate bus converter for CPU power and ASICs with high peak power requirements. The product features an innovative transformer-related, uninsulated topology that reduces the number of components and voltage and provides an efficiency level reaching a peak of 97.7% at 54 V input. The reduction in product characteristics is characterized by the innovative 3D graphics of the thermal data of Flex Power Modules, which determine the available output power for a given real temperatures of the pins and the base plate. This allows maximum power to be extracted without voltage to the converter. For even higher power levels, active current sharing between parallel modules is offered. BMR350 x250 / 531 complies with EMI standard EN 55032 / FCC part 15J “Class B” when used with a recommended external filter.

Full protection against output overvoltage, overcurrent and overheating of the module is included, and the PMBus® interface provides remote control and monitoring supported by the ‘Flex Power Designer’ software tool. A specific feature is the inclusion of an “event data recorder”, which can be interrogated even after the inverter is switched off for analysis of any specific voltage or fault conditions.
The finishes are through pins for through holes, which are suitable for re-melting with a pin in paste, corrugated or manual soldering.

Ole Helgren, Director of Product Management and Marketing at Flex Power Modules, commented: “We have almost doubled the power of our BMR350 product to the same size for an even wider range of applications such as bus converters. With its innovative cost-saving technology, the product now represents even better value per dollar per watt.

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






Digital quarter-brick DC/DC features increased power rating to 1700 W peak

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