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Brick converter sustains 250Vdc input to output isolation

Posted: 29 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:brick converter? hardware? communications? broadband?

PKB-A brick converter

Ericsson Power Modules has introduced its latest eight-brick PKB-A brick converter series optimized to deliver 30A or 125W with high efficiency throughout the operating range for applications requiring an average power of 100W.

With the heritage of the PKB series combined with elements of the cost efficient PKM-E platform, the PKB-A has been designed to meld two important market requirements, low power consumption and cost efficiency. The PKB-A offers customers an alternative solution when the requirement is to reduce hardware-cost without compromising quality and long-term reliability.

"With the increase in demand for high-speed communications and broadband everywhere, systems architects are facing an increase in demand for remotely located low and medium power systems requiring an average of 100W of power. Because these systems are deployed in high-volumes, they have to be cost-effective without compromising quality and reliability, and that is what Power Modules has achieved with PKB-A", said Patrick Le Fvre, marketing and communication director at Ericsson Power Modules.

The PKB-A series comprises two models within the PKB 4000A 48V input (38V to 72V) platform. These are the PKB 4111A (5V/25A) and the PKB 4910A (3.3V/30A). Both products are available for surface mount use as SI versions, and through-hole assembly use as PI versions. At its nominal voltage (48V) at 50 percent load, PKB 4111A (5V) has a typical efficiency of 93.1 percent and 92.3 percent at full load, whilst the PKB 4910A (3.3V) offers 92.7 percent at 50 percent load and 91.0 percent at full load.

To address the needs of ICT applications requiring higher functional isolation, the PKB-A is designed to sustain 2250Vdc input to output isolation. Its low profile of 8.5mm allows designers to layout in a chassis using a narrow board-pitch, and thanks to low building practices, significantly improve airflow across the board.

Primarily designed to power 100W boards in 48V ICT applications, as a result of its optimized cost structure and efficiency, PKB-A is an ideal board-mounted power module to power micro-cells repeaters, local transmitters also many other on-board power applications such as servers, routers and wide range of systems where cost reduction is the aim. Specific examples include 100W boards powering systems such as 5V intermediate bus architecture, memories, DSP, FPGA, ASIC and other integrated circuits requiring 5V and/or 3.3V.

The PKB-A is pinout compatible with quarter-brick units making it simple to replace older, low efficient 100W quarter-bricks when upgrading boards. It is compliant with the RoHS directive 2002/95/EC.

Comprehensive protections embrace output over-voltage and short-circuit protection, input under-voltage protection, and over-temperature protection. Other features include monotonic startup, remote sense and control, and a choice of remote control logicnegative or positive.

In technology terms, the PKB-A is based on the deployment of a board-integrated transformer, and its layout has been optimized to minimize hot spots and to reduce layer-to-layer power losses. On the top side, the layout and positioning of components have been optimized to simplify cooling when converters are mounted onto a cold-wall via a thermal pad.

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