Fully regulated intermediate bus converters incorporate digital control to provide high performance benefits

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By eeNews Europe

The converters are CUI’s first product release based on the license agreement with Ericsson, the world’s leading provider of technology and services to telecom operators, for their Advanced Bus Converter portfolio based on the FRIDA II platform.  

CUI’s NQB and NEB series are pin and function compatible with Ericsson’s BMR456 and BMR457 series respectively, enabling OEMs to address interoperability challenges, reduce time to market, and decrease supply chain risk for these leading-edge digital products. 

The NEB series, housed in an 1/8 brick package, and the NQB series, housed in a 1/4 brick package, incorporate a 32-bit ARM-based microcontroller with power-optimizing firmware designed to maximize and flatten the efficiency curve, providing peak performance across a much wider range of loading conditions when compared to intermediate bus converters currently on the market. 

With typical efficiencies as high as 96.4% and optimized efficiency from 20% to 100% load, the modules are ideal in applications where loading conditions can vary greatly, including next-generation Information and Communication Technology (ICT) equipment.  The firmware is also designed to handle input voltage transients with slew-rates of up to 0.5 V/µs, while keeping the output voltage within ±10% and ensuring that the output voltage does not trigger over-voltage protection.

Both the NEB and NQB series provide a digital interface that is PMBus 1.2 compliant, allowing customers to configure and store a range of parameters via a USER_STORE memory block.  Designers are able to set a number of protection features including over-temperature, over-current, and over-voltage.  Additional configurable parameters include output voltage, voltage margining, fault management, precision delay ramp-up, and start/stop.

The new converter family is available in two input range configurations; 40 to 60 Vdc input for datacom applications and 36 to 75 Vdc for telecom applications.  The NEB 1/8 brick series is offered with power ratings ranging from 264 to 300 W, while the NQB 1/4 brick series is available in 420 to 468 W configurations.  Output voltage for all models is preset at 12 Vdc, but for dynamic bus applications, users are able to dynamically adjust the NEB’s output voltage via PMBus from 6.9 to 13.2 Vdc and the NQB’s output voltage from 4.0 to 13.2 Vdc.  For higher power requirements, optional Droop Load Sharing is offered in both series.  Additional features include insulation requirement that meet EN60950 standards, 2250 Vdc isolation voltage, and remote sensing.  To address high temperature applications, both series offer an optional baseplate for improved thermal performance.

For conventional intermediate bus converter requirements, the NEB and NQB series are available without digital communication pins in an industry standard 5-pin package.  


Samples are available now for digital and 5-pin models.  

Visit CUI at


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