BMR310 IBC boosts power density for data centres

A non-isolated switch capacitor intermediate bus converter (IBC) from Flex Power Modules is based on Infineon Technologies’ ZSC (Zero voltage switching Switched capacitor Converter) technology.  The BMR310 provides high power density for data centres, to free space for other components.

The BMR310 achieves efficiency of over 98 per cent at half load and can deliver up to 875W continuous. It operates over an input range of 40 to 60V and delivers an unregulated output voltage of 10 to 15V.

ZSC delivers the highest efficiency and power density for applications using 48 V to generate an intermediate bus voltage, claimed Infineon, to meet the growing trend away from 12V power distribution in data centres and high performance computing (HPC) applications. As they adopt 48V power distribution to reduce distribution currents and power losses, ZSC facilitates capacitive energy transfer with soft switching of the power MOSFETs for a low-risk migration path for legacy 12V systems to a 48V infrastructure at “significantly reduced” total cost of ownership (TCO), said Infineon.

The compact BMR310 measures 58.4 x 25.0 x 10.3mm (2.3 x 0.98 x 0.41 inch3). It 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. The current mounting option is base-plated but an open frame will be available with future models.

To maximise operating lifespan, the BMR310 includes over-voltage, under-voltage, over-current and over-temperature protection function. As with all Flex Power Modules’ DC/DC converters, it complies with IEC/EN/UL 62368-1 safety standards.

Passive droop load sharing supports paralleling to enable multiple converters to be combined if required. The BMR310 is compatible with the Flex Power Designer software tool, and includes a PMBus interface for digital control.

Evaluation samples of the BMR310 are available now, with general availability scheduled for November 2021. 

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