Advanced bus converter from Ericsson delivers industry-leading efficiency

Ericsson’s PKB4413DA is a low-profile, 408W DC/DC converter module, designed to provide point-of-load (POL) DC/DC converters with tightly regulated 12V output at up to 34A.

The module’s five-pin, 1/8-brick footprint is compatible with the Distributed-power Open Standards Alliance’s (DOSA) standard and has a full 36-75V telecom input range, making it suitable for intermediate bus conversion in information and communication technologies (ICT) applications.

The PKB4413DA enables engineers to benefit from Ericsson’s Hybrid Regulated Ratio (HRR) technology, which minimises power losses while delivering high-power conversion from a wide range of input voltages. The module also offers class-leading performance in thermally challenging situations. Efficiency can be up to 96% with a 48V input and 12V output at half-load, significantly cutting energy and cooling costs.

The module meets the deployment requirements for intermediate bus voltage and distributed power architectures, and is aimed at high-performance, high-power use cases in industrial, networking, telecoms, servers and data storage equipment.

The HRR topology, found in the PKB4413DA, means that it responds well to load and line transients, guaranteeing that output voltage remains stable, and won’t be affected by the voltage deviations that occur as a result of system bus power disturbances. For power system architects, this ensures intermediate bus voltage integrity remains within the required tolerance.

The PKB4413DA can reliably deliver higher usable power in environments with limited airflow or high ambient temperatures. Its tellurium copper pins give excellent thermal transport, while the module is connected to a coldplate or heatsink via a baseplate. The thermal path from the thermally critical components to the baseplate has been carefully designed, resulting in a flat thermal profile for the key elements, along with excellent heat transfer to the heatsink or baseplate.

The module comes in a standard eighth-brick format (58.4 x 22.7 x 13.2mm), is designed to be through-hole mounted and offers 1500V(DC) I/O isolation. It also includes I/O protection and operational features, such as input under-voltage shutdown, monotonic start-up and remote control, as well as output over-voltage, over-temperature and output short-circuit protection. Its calculated MTBF is 8.5 million hours, and the module meets IEC/EN/UL60950-1 safety requirements.

Neil Tyler