400W non-isolated unregulated Intermediate Bus Converter
The BMR320 is a non-isolated, unregulated Intermediate Bus Converter (IBC) housed in an extremely compact package measuring just 27 x 18 x 6.4mm (1.06 x 0.71 x 0.25 in), and delivers 400W of continuous output power from an input voltage of 40-60V. This equates to a power density of 128 W/cm3 (2126 W/in3).
The unregulated device utilizes an 8:1 fixed ratio, meaning the output voltage ranges from 5-7.5V, ideal for those applications that require a lower intermediate bus voltage that can be helpful to optimize overall system efficiency when used in conjunction with downstream POLs, VRMs or Integrated Power Stages such as the BMR510 and others.
With efficiency peaking at 97.7%, up to three units can be paralleled for a total load of 1080W. The parts are mechanically and thermally designed for top-side cooling to a heatsink with airflow, or for liquid cooling via a thermal block, where the relatively flat design of the topside of the converter allows for easy connection via a thermal interface material such as a gap pad.
The BMR320 protection features include output current limit and over-voltage, along with over-temperature and input under-voltage. A PMBus® interface is included for monitoring, configuration and control, and the part is supported by the Flex Power Designer Tool.
As with all Flex Power Modules’ DC/DC converters, it complies with IEC/EN/UL 62368-1 safety standards.