Isolated 40A eighth-brick DC-DC converters deliver 95% efficiency

May 09, 2017 // By Nick Flaherty
Ericsson has launched two DC-DC converter modules in eighth-brick formats that are able to handle currents of up to 40A and deliver efficiencies over 95% to make them the most efficient such modules in the industry.

 

The PKB4211D and PKB4110D deliver respective efficiencies of up to 95.3% and 94.7%, with tightly regulated 5V and 3.3V outputs at 50% load. The modules target high-end and high-power applications that are powered by multi-cell batteries or rectifiers, commonly used in the Information and Communication Technologies (ICT) industry. Designed for distributed power architecture systems, they meet the needs of a wide range of ICT applications including telecommunications and networking, servers and storage systems, and industrial equipment.

Offering a wide voltage input range from 36V to 75V, the PKB4211D delivers up to 200W output power with a 5V, 40A output, and the PKB4110D provides up to 132W with a 3.3V, 40A output. Both are available in an industry-standard DOSA-compatible five-pin eighth-brick footprint with dimensions of 58.4 x 22.7mm and low-profile height of 9.6mm.

A key feature of the PKB4000 series is its ability to deliver higher usable power in high ambient temperatures and environments with limited airflow. The PKB4211D can deliver full power of 5V at 40A in an ambient temperature of 70°C with 200 LFM (linear feet per minute) airflow in an open-frame unit with no baseplate. The module can also deliver the same load in an ambient temperature of 80°C with 200 LFM airflow with optional heatsink.

In addition, the open-frame version of the PKB4110D provides full power, delivering a 3.3V 40A output at 80°C with 200 LFM airflow and at 85°C with 200 LFM airflow with a baseplate. While use of the modules’ optional baseplate offers improved thermal performance, the units can also be connected to a heatsink or cold plate.

“The excellent thermal properties of these modules deliver high-power conversion across a wide input voltage range, while keeping power losses low,” said Martin Hägerdal, Head of Ericsson Power Modules. “This results in highly efficient power conversion of more than 95%, delivering exemplary performance and high reliability in applications that feature limited airflow.” 

Offering an MTBF (mean time