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DC/DC module touts high output power

Posted: 16 Feb 2009     Print Version  Bookmark and Share

Keywords:line-regulated  sixteenth-brick  IBC 


Ericsson has unveiled the line-regulated IBC PKU-B series with the PKU4101B PI 5V@ 20A DC/DC converters available in through-hole and surface-mount versions. The devices are suitable for datacom/networking, wireless networks, optical network equipment, server and data storage applications.

The products are aimed at existing sixteenth-brick customers who want to power higher-demand applications without redesigning boards for larger products (eighth-brick), thus saving time, costs and making the transition faster and easier (reduced time-to-market).

The PKU-B will also benefit customers facing challenging board space optimisation and migrating from eighth-brick to sixteenth-brick without compromising performance.

Flaunting less than 8.3mm height, the PKU-B module is suitable for applications aiming for low building height, guaranteeing enough isolation distance between the module and an adjacent board.

The converters meet the insulation requirements of EN60950 and come complete with vital industry-standard features, such as remote on/off, overt temperature protection, output over-current and over-voltage protection, and input under voltage protection.

A major factor driving the demand for these types of products are end-customers who are continually adding functionalities to applications that require more power per board while expecting a reduction in the space allocated to the on-board power sources.

Offering high power in a small density package, the sixteenth brick PKU-B's output power reaches 100W (312W/inch²). That is in line with some IBC eighth-brick products available on the market.

High reliability
The PKU-B is designed to be highly efficient and cost effective. With its creative design technology and optimised component placement, the converter possesses high electrical and thermal performance as well as high reliability under stressful operating conditions. The 5V product is up to 92 per cent efficient across the entire input voltage range, and from 50 to 100 per cent load.

The electrical design is a line-regulated half-bridge configuration with the control circuit on the primary side. Both the transformer and the output inductor windings are integrated in the PCB. The primary side is fed internally with an isolated flyback converter with the switching frequency synchronised to the main control circuit.

Compared to traditional regulated intermediate bus converters and the previous generation of PKU DC/DC converters, the PKU-B delivers up to 100 per cent higher power. In fact, the PKU4101B PI (5V output) delivers 100W, compared to the PKU 4511 PI, which delivers 50W.

To attain its high power density, the PKU-B series uses a very advanced 14-layer PCB with a copper thickness of 3oz to achieve high efficiency and good thermal performance. The PKU-B series has monotonic start up and can withstand 100 per cent pre-bias on the output.

With the already released quarter-brick intermediate bus converter PKM-B, and the eighth brick PKB-B in development, this latest sixteenth-brick completes the IBC product portfolio.

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