Sunday, December 4, 2022

Compact Non-Isolated Bus Converter With 97.7% Efficiency

By Sharad Bhowmick

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BMR320 is an 8:1 non-isolated bus converter suitable for applications where power density, efficiency and low cost are critical factors.

Image of BMR320 module (source: Flex Modules)

 

Flex power modules have released BMR320, an 8:1 non-isolated bus converter. The BMR320 is an unregulated, DC-DC intermediate bus converter which operates over a 40-60 VDC input range. The module comes in a compact package measuring just 27 x 18 x 6.4mm with an efficiency of up to 97.7%. A non-isolated DC/DC bus converter can increase efficiency and density at a lower cost. The flat design of the module allows easy integration of the heatsink, thus making the module suitable for top-side cooling to a heatsink with airflow or for liquid cooling via a thermal block. The module is suitable for a wide field of applications including use in datacom, cloud computing and AI.

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The BMR320 operates over a 40-60 VDC input range, producing a 5 to 7.5 VDC output, and a maximum rated power of 400W/60A at 54V. The module offers a high power density of 128 W/cm3 (2126 W/in3) with efficiency peaking at 97.7%. Moreover, cascading of up to three units is possible which can provide a total load of 1080 W. The BMR320 offers multiple safety features including output current limit and over-voltage, along with over-temperature and input under-voltage.

Anders Sellin, Strategic Product Manager at Flex Power Modules comments “The BMR320 intermediate bus converter is designed for optimum system efficiency when used alongside point of load converters and Integrated Power Stages such as our BMR510 and upcoming BMR515. It is a great solution for datacom, cloud computing and AI applications, where power density, efficiency and low cost are critical factors”.

According to the company, the module is supported by the Flex Power Designer tool and a PMBus interface available in the module enables monitoring and control. The unregulated, non-isolated architecture used in the BMR320 reduces the output impedance of the converter when compared to regulated designs, which effectively reflects the input bus capacitance efficiently to the output, enhancing its ability to cope with large load transients with minimal “droop”.


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