Flex Power Modules Introduces Isolated DC-DC Converter


BMR481 Isolated DC-DC converter will address the demands of next generation data centres by implementing compact, higher efficiency and cost-effective power system

Flex Power Modules has released new BMR481 Isolated DC-DC converter. It is the first generation of Direct Conversion products to address the growing need for higher energy efficiency levels in data centres and cloud computing infrastructure.


According to the company, this direct conversion DC-DC converters have increased efficiency which can help data centres in saving considerable amount of power, reducing heat and saving cost too.

Specification of BMR481 DC-DC converter:

  • Input range of 40-60V targeting 48-54V nominal supplies
  • Programmable 0.5-1.35V output
  • Footprint 12 x 27.7mm
  • Maximum output current of 70A
  • Incorporates a digital interface for monitoring, configuration and control purposes

This main unit can be supported by up to 5 additional ‘satellite’ modules, resulting in a total current rating that reaches 420A. Despite the incredibly small size of the modules they are able to handles phenomenally high currents for their size.

Provides Streamlined and Economical Solution

The single-stage BMR481 act as an attractive alternative for conventional two-stage intermediate bus converter (IBC) and point of load (POL) architecture – where an extra conversion step is required, which thereby takes up greater space and impacts operational performance.

In contrast, this new Direct Conversion module presents engineers with streamlined and economical solution. It is capable of achieving up to 92% efficiency from a 1V output at 53V in – which is 2-3% higher than what an equivalent IBC-based deployment can deliver.

It also allows a reduction in board area of up to 50%. MTBF is in excess of 8.7Mhrs for the main module.

Digital PoL Regulator For High Power Density ICT Applications

Optimized Efficiency

Optimized efficiency is achieved by automatic enabling and disabling of phases/satellite modules depending on the required load, along with dynamic voltage adjustment to provide optimum supply rails to connected ICs.

Reduced Noise and Ripple
Output ripple and noise is extremely low, typically 1mV p-p, due to the zero voltage/zero current switching employed. Load and line regulation are typically kept to just 1mV. At 53V input and 0.5V output, the full 70A output current is available from the main module to over 75°C ambient temperature with 0.5m/s airflow and to over 90°C with just 2m/s airflow.

Full Digital Control

With a PMBus v1.3 interface compliant with PMBus or AVS / SVID, provides full digital control. Isolation is rated at 1500VDC (functional).

Olle Hellgren, Director Product Management and Business Development at Flex Power Modules, commented: “Direct Conversion will be pivotal in stopping data center capital and operational costs from spiraling, as well as enabling increasingly stringent energy efficiency guidelines to be met. This is being made possible by eliminating the 12V intermediate level conversion stage in order to boost efficiency, along with utilizing less board space. With the BMR 481, Flex is pushing forward the proliferation of Direct Conversion, and demonstrating the huge potential of this new power conversion architecture.”



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