Non-Isolated Switched Capacitor Intermediate Bus Converter with High Power Density for 48V Data Center Applications

Flex Power Modules has introduced a non-isolated switched capacitor intermediate bus converter (IBC) which provides high power density for data centers, thus improving board space utilization and freeing space for other components. The new BMR310 IBC is built on the proprietary Zero voltage switching Switched capacitor Converter (ZSC) technology of Infineon Technologies AG and achieves an efficiency of over 98 percent at half load. It can deliver power up to 875W continuous in a compact package and is suitable for high-performance computing (HPC) applications. It operates over an input voltage range of 40V to 60V and delivers an unregulated output voltage of 10 V to 15 V.

The BMR310 is mounted horizontally with a height profile of 10.3mm, making it suitable for systems with limited space due to large heatsinks or cold plates. It measures 58.4mm x 25.0mm x 10.3mm (2.3 x 0.98 x 0.41 in 3). The current mounting option is base-plated but an open frame will be available with future models. The BMR310 IBC complies with IEC/EN/UL 62368-1 safety standards and includes over-voltage, under-voltage, over-current, and over-temperature protection functions. Moreover, it is compatible with the Flex Power Designer software tool and includes a PMBus interface for digital control.

The Infineon ZSC delivers the highest efficiency and power density for applications using 48V to generate an intermediate bus voltage. This is achieved through capacitive energy transfer with soft switching of the power MOSFETs, and therefore enables an easy and low-risk migration path for legacy 12 V systems to a 48 V infrastructure at significantly reduced total cost of ownership (TCO).