Power Electronics
Image courtesy of Ericsson

(Image courtesy of Ericsson).

Advanced Bus Converter Module

Ericsson Power Modules announces the BMR458, a third-generation 3E* quarter-brick advanced bus converter that delivers industry-leading performance to system architects developing equipment for Information and Communication Technology (ICT) applications, including datacom and server and storage systems. The module is ideal for high-power applications that are powered by multi-cell batteries or rectifiers commonly used in the ICT industry and employ intermediate bus conversion (IBC) or dynamic bus voltage (DBV) architectures.

The BMR458 represents the cutting edge of technology for advanced bus converters and comes with a host of features. These include the highest power delivery (650W) in the industry for a quarter-brick advanced bus converter, thereby reducing the number of required modules in very high power applications; and highly accurate current sharing, as well as it being the only advanced bus converter available today to offer active- or droop-current sharing. Other key features including dynamic load compensation, snapshot parameter capture, and a PMBus v1.3 interface.

Key electrical characteristics of the module include class-leading high efficiency of up to 96.6% at half load and 96.3% at full load; maximum current output of 54.2A; tightly regulated 12V output (±2mV, typical) across the 40 to 60V input voltage range; output current monitoring of ±1A to enable highly accurate system monitoring capability; and a fast transient recovery time of only 1ms. Further specifications include: an MTBF of 8.2 million hours; and I/O functional isolation of 2250Vdc, which meets the latest IEC/EN/UL60905 safety standard.

The BMR458's dynamic load compensation (DLC) feature adjusts the control loop to meet the capacitance load. To help engineers further, the DLC feature can also be used in conjunction with the Ericsson Power Designer software tool, which has been developed for the initial development and prototyping of digital power systems, via the module's PMBus (revision 1.3) interface, which also enables advanced digital energy-monitoring and control functionality.

Available in the industry-standard quarter-brick format with dimensions of 2.28 x 1.45 x 0.5in (57.9 x 36.8 x 12.7 mm), 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.

The groundbreaking BMR458 has been built to the highest quality design and manufacturing standards, enabling Ericsson to deliver to customers a continued high level of confidence in its power modules. The price of the BMR458 starts at $62 for OEM quantities. 

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