BMR492 Digital Eighth-Brick DC/DC Converter with Peak Power Capabilities

Flex Power Modules' BMR492 series of digital eighth-brick intermediate bus converters is capable of delivering between 600 W to 800 W of continuous power along with a peak power of up to 1100 W for short periods <1s. This so-called "burst mode" operation is commonly required for the demanding CPUs in datacom and data center type applications.

The first of three available variants is the BMR4920302/861 converter. It delivers a 12 V output and is rated to a maximum 600 W output over an input voltage range of 40 V to 60 V. The DC/DC step-down solution is ideal for nominal 48 V or 54 V input voltage systems commonly found in data center server applications. The through-hole mounted device is fully regulated and includes an input to output isolation voltage of 1500 V_DC.

This BMR492 variant is extremely efficient, evidenced by a peak efficiency level of 96.7% at 48 V_IN at half load. The output voltage is pre-programmed to 12 V as standard, but this V_OUT level can be adjusted across a wide range of 8 V to 13.2 V using the incorporated PMBus® interface. This feature is also useful to optimize system-level efficiencies through dynamic bus voltage adjustments according to the supplied load.

The converter comes in an industry-standard eighth-brick format with 58.4 mm x 22.7 mm x 12.7 mm (2.3 in x 0.90 in x 0.34 in) dimensions. The baseplated variants have a standard DOSA pinout, including the 7-pin digital header for the PMBus interface.

The converter is equipped with smart protection mechanisms such as overvoltage, overtemperature, and short-circuit protections, which help provide a prolonged operational lifespan with a mean time between failures (MTBF) of 6.64 million hours. Additionally, as with all Flex Power Modules' DC/DC converters, these units comply with IEC/EN/UL 62368-1 safety standards. The devices offer an operational temperature range of -40°C to +125°C.

Applications

• BMR491 is designed for datacom applications but can be applied in telecom and other applications as well.