Bus converter module raises the bar for high power control and delivery

Bus converter module raises the bar for high power control and delivery

New Products |
By Nick Flaherty

The BMR458 is aimed at high-power applications that are powered by multi-cell batteries or rectifiers commonly used in the ICT industry and uses intermediate bus conversion (IBC) or dynamic bus voltage (DBV) architectures over the full operational input range of 40V to 60V.

With the highest power delivery in the industry for a quarter-brick advanced bus converter, the 12 V, 650W BMR458 reduces the number of modules needed for very high power applications with accurate current sharing, as well as offering active- or droop-current sharing. Other key features including dynamic load compensation, snapshot parameter capture, and a PMBus v1.3 interface.

“This is a major product introduction by Ericsson and further strengthens its position as the leader in delivering the world’s most advanced power modules, while also meeting growing industry demands for ever higher power,” said Martin Hägerdal, Head of Ericsson Power Modules. “The BMR458 is the highest power advanced bus converter available today and comes with innovations to deliver best-in class reduction in energy consumption for today’s power system architects.”

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. The MTBF is 8.2 million hours and the I/O functional isolation of 2250Vdc meets the latest IEC/EN/UL60905 safety standard.

The module’s dynamic bus voltage capability is important for the most advanced power systems and enables the module’s output voltage to be adjusted to suit the load, thereby maximising overall system efficiency and reducing energy consumption. The module also delivers highly accurate current sharing with both active and droop options for paralleling up to more than six modules, delivering higher reliability and greater available power. The dynamic load compensation (DLC) feature adjusts the control loop to meet the capacitance load and this can also be used in conjunction with the Ericsson Power Designer software tool via the module’s PMBus (revision 1.3) interface, which also enables advanced digital energy-monitoring and control functionality.

Other features include a snapshot parameter capture analysis tool, which stores the last known measurement; adaptive ramp time, which modifies ramp time to suit output capacitive load; and automatic backward current protection when paralleling modules, which simplifies OR’ing circuitry.

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