Ericsson Power Modules Reduce Hardware Costs

The PKB-A power module series, based on an electrical platform used by Ericsson Power Modules in its original eight-brick PKB, delivers 30A or 125W for applications requiring an average power of 100W. With the legacy of the PKB series combined with elements of the cost-efficient PKM-E platform, the PKB-A has been designed to provide low power consumption and cost efficiency. As a result, the PKB-A offers an alternative solution for customers wanting to reduce hardware costs without compromising on quality and long-term reliability.

Combining electrical and mechanical design, layout optimisation and a simple-to-manufacture methodology are all part of Ericsson Power Modules' Design for Manufacturing (DfM) concept. Excellent thermal design makes it possible to utilise full power so that the 100W ceiling is passed with a cost-efficient product, according to the company. Currently, the PKB-A series comprises two models within the PKB 4000A 48V input (38-72V) platform.

Both the PKB 4111A (5V/25A) and the PKB 4910A (3.3V/30A) are available for surface-mount use as SI versions and through-hole assembly use as PI versions. At its nominal voltage (48V) at 50 per cent load, the PKB 4111A (5V) has a typical efficiency of 93.1 per cent and 92.3 per cent at full load, while the PKB 4910A (3.3V) offers 92.7 per cent at 50 per cent load and 91 per cent at full load.

To address the needs of information and communication technology (ICT) applications requiring higher functional isolation, the PKB-A is designed to sustain 2,250VDC input-to-output isolation. Its low profile of 8.5mm (0.335in) allows designers to lay out in a chassis using a narrow board pitch below the traditional 0.8in and, thanks to low building practices, significantly improve airflow across the board. Primarily designed to power 100W boards in 48V ICT applications, the PKB-A is a suitable board-mounted power module to power micro-cell repeaters, local transmitters and many other onboard power applications such as servers, routers and a range of systems.

Specific examples include 100W boards powering systems such as 5V intermediate bus architecture, memories, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs) and other integrated circuits requiring 5V and/or 3.3V. The PKB-A is pin-out compatible with quarter-brick units, meaning that it can be used to replace older, low-efficient 100W quarter-bricks when upgrading boards. It is compliant with the RoHS 2002/95/EC directive. According to Ericsson Power Modules, comprehensive protections embrace output over-voltage and short-circuit protection, input under-voltage protection and over-temperature protection.

Other features include monotonic start-up, remote sense and control and a choice of remote control logic (negative or positive). The PKB-A is based on the deployment of a board-integrated transformer and its layout has been optimised to minimise hotspots and to reduce layer-to-layer power losses. On the top side, the layout and positioning of components have been enhanced to simplify cooling when converters are mounted onto a cold wall via a thermal pad.

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