Second Generation Direct Conversion DC-DC Converter for Data Centers
06-15-2021 | Flexible power supply module | Power
Flex Power Modules offers the BMR482, its second generation of direct conversion isolated DC-DC converter. By converting directly from a 48V power supply to load voltage without an intermediate stage, the device offers increased efficiency in a compact package, enabling it to meet the higher power demands of data centers and cloud computing. today.
The device can achieve an efficiency of up to 91.3% with an output of 0.8V at 53Vin, which is 2-3% better than an equivalent solution based on an IBC and a PoL. The single-stage converter also requires up to 50% less board space than a conventional two-stage solution, helping to reduce overall costs.
The new converter is offered as a “main unit”, measuring only 30mm x 12.7mm x 16.8mm, which incorporates a digital interface for monitoring, configuration and control, and can produce a maximum output current of 110 A. If a higher output current is required, up to five “satellite” modules can be added, each measuring 30mm x 12.7mm x 15.4mm, to give a maximum total output current of 660 A. These are automatically turned on and off by the main unit according to the output current consumed, indicating that the efficiency is dynamically optimized over the entire current range.
Designed for server applications, it has an input range of 40 to 60 V, which allows it to operate with nominally rated power supplies of 48 V or 54 V. It has a programmable output voltage of 0.5 to 1 , 35 V and the main powertrain has 1500 V isolation from input to output.
The device is compatible with PMBus v1.3, AVSBus and Intel SVID interfaces, providing full digital control. It is supported by the Flex Power Designer software tool, which makes power system design simpler and faster.
Olle Hellgren, Director of Product Management and Business Development at Flex Power Modules, said: “Today’s data centers are testing the limits of conventional IBC / PoL architectures, with up to 3kW or 4kW required by card. The BMR482 solves this problem by directly converting the 48 V or 54 V system bus voltage to PoL voltage, which is typically less than 2 V.