Ericsson upgrades BMR458 quarter-brick bus converter with burst-mode capability

Adding burst-mode capability to the BMR458 negates need for a second converter module in parallel, says Ericsson Power Modules. The BMR458 delivers up to 650W, making it suitable for a range of information and communication technology (ICT) applications.

The BMR458 is designed to meet the demands of high-end and high power applications based on intermediate bus conversion (IBC) and dynamic bus voltage (DBV) architectures, adds Ericsson.

Ericsson Power Modules has upgraded the BMR458 third-generation 3E quarter-brick, advanced bus converter, integrating burst-mode operation, which enables the module to handle 1079W of peak power for a brief period of time, up to a maximum of one second.

The company reports that high-performance microprocessors and ASICs will increasingly require brief bursts of high current demand in excess of normal system operation. This burst-mode or peak-power capability eliminates the need for a second converter module to be placed in parallel.

The BMR458 can be used by system architects developing equipment for ICT applications, including datacomms and server and storage systems. The module is suitable for high-power applications that are powered by multi-cell batteries or rectifiers commonly used in the ICT industry, and which employ IBC or DBV architectures.

The upgrade of the BMR458 meets the need to handle peak current, commonly demanded by the latest system processors, ASICs and other system on chip (SoC) devices. Other features of the BMR458 include, what Ericsson claims is the highest power delivery (650W) available for a digitally operated quarter-brick advanced bus converter controlled via the PMBus. This feature reduces the number of required modules in very high power applications. The BMR458 also has accurate current sharing, and is believed to be the only advanced bus converter available today to offer active- or droop-current sharing. It also has dynamic load compensation, snapshot parameter capture, and a PMBus v1.3 interface.

Electrical characteristics include class-leading high efficiency of up to 96.6 per cent at half load and 96.3 per cent at full load. There is a maximum current output of 54.2A; and tightly regulated 12V output (±2mV, typical) across the 40 to 60V input voltage range. Output current monitoring is ±1A, to enable accurate system monitoring capability; and a fast transient recovery time of only one millisecond. Further specifications include a mean time between failure (MTBF) of 8.2 million hours and input/output I/O functional isolation of 2250V DC, meeting the latest IEC/EN/UL60905 safety standard.

The BMR458 is available in the industry-standard, quarter-brick format, measuring 2.28 x 1.45 x 0.5-inch or 57.9 x 36.8 x 12.7mm. Ericssson adds that the module also offers excellent performance in challenging thermal environments. Delivering higher reliability overall, it provides higher useable power in applications that have a high ambient temperature and/or limited airflow. However, the module is also available with an optional baseplate, enabling connection to a heatsink or cold plate for the most extreme environments.


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