Next-generation non-isolated digital quarter-brick DC-DC delivers high efficiency

Flex Power Modules is launching the BMR350, a quarter-brick, non-isolated DC-DC converter rated at 860W continuous and 1200W peak power, ideal as an intermediate bus converter for powering processors and ASICs with peak power demands. The product provides an input of 40-60V (80V/100ms) and a fully regulated output of 12V at 100A maximum, adjustable from 8V to 13.2V. An innovative transformer-coupled, non-isolated topology reduces component count and current stress. It yields an efficiency level peaking at >97.8% at half load 48V input voltage. Derating for the device is characterised by the innovative company's 3D thermal data graphs, which specify available output power for given real-world pin and baseplate temperatures up to 100C, with the user's airflow rate. This allows maximum power to be extracted with no stress to the converter.

Active current sharing between paralleled modules is an option for higher power levels. The device meets EMI standard EN 55032/FCC part 15J 'Class B' with a recommended external filter.

Complete protection is included against output over-voltage, over-current and module over-temperature, and a PMBus interface offers remote control and monitoring, supported by the 'Flex Power Designer' software tool. A distinct feature is the inclusion of an 'event data recorder', which can be interrogated to analyse stress conditions before converter shutdown.

The device is in the standard quarter-brick format of 58.4mm x 36.8mm footprint with a height of only 12mm, including the integrated baseplate with its threaded fixing holes. Terminations are via through-hole pins, suitable for pin-in-paste reflow, wave, or manual soldering, and positions are compatible with similar products on the market.

Anders Sellin, product manager, Flex Power Modules, comments: "We have adopted a novel approach with the BMR350 with its transformer-coupled, non-isolated topology. This keeps costs and component stresses low without compromising efficiency."