Ericsson公司的PKM5000D是一个1/4砖 DC/DC电源模块，输入电压的范围是18V到75V，输出电压是 24V或者48V。对于使用24V或者48V电池供电的应用，设计者能够很轻松地使用本产品为其设计多总线电压板，从而简化管理并降低成本。PKM5000D能够提供120W的功率，相比市场上同类产品要高出20%。通过使用外部电阻，本产品的输出电压可调至10.8V至13.2V。PKM5000D有高温、限流、高压三种保护模式。

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Ericsson's ultra wide input range Power Module simplifies power radio applications

Jun 23, 2010

Designed for systems powered by 24V or 48V batteries, Ericsson Power Modules' PKM5000D is a quarter-brick, isolated DC/DC converter that is optimized to deliver the highest efficiency across an ultra wide input voltage range of 18V to 75V. It is suitable for a very large range of applications in ICT, offering systems' designers the opportunity to use the same DC/DC converter for use in 24V and 48V systems, also to power remote-feeding applications that utilise 20V to 60V line voltages with an operational margin to ensure that remote systems will always operate whatever the source voltage status is.

ICT equipment is mostly powered by 48V, but it is common in radio-applications to use 24V batteries instead. As a result, systems’ designers often have to design two versions of the same board, embedding a dedicated 48V or 24V DC/DC converter, when an ultra-wide input range module could accommodate both voltages in one single unit.

The series' ultra-wide input range of 4:1 is primarily for use in radio-base stations equipment but not limited to. The PKM5000D is a very flexible product that is very suitable to power industrial applications using remote peripheral equipments powered through long-wires, very similar to remote feeding traditionally used in radio-base stations. Because of its performance and features, the PKM5000D is also suitable for applications such as transportation, test-equipment, process-control and others.

The designer's task is greatly simplified when designing multi-bus voltage boards that could be used in different applications powered by 24V and/or 48V batteries, thus simplifying inventory management and reducing cost. The first variant released in the series is a 12V tightly regulated converter with an output current of 10A. More variants will soon be offered as the series rolls out.

Because it is based on a standard quarter-brick footprint, when designers are upgrading existing 48V or 24V boards to match 'single code boards' to cover both system voltages, without redesign the PKM5000D can replace 2:1 input DC/DC converters, accommodating both voltages in one 'single code module'.

At 120W, the PKM5000D offer a massive 20 percent more power than current similar products available on the market that deliver just 100W. Further, with a half-load efficiency figure of 91.8 percent at 27V input voltage and 89 percent at 53V input voltage, the converter is very well positioned in the marketplace for ultra-wide input range products.

By the simple process of using external resistors, the converter's output voltage can be adjusted in the range of 10.8V to 13.2V, and the standard product is delivered with a remote-control that complies with negative logic, with positive logic available as an option.

Protection levels include over temperature (OTP), over current limit (OCP) and over voltage (OVP). For safety the PKM5000D has a galvanic input to output isolation of 1500V and according to Telcordia SR332, issue 1, black box technique, it offers an excellent MTBF figure of 1.47 million hours. It is compliant with the RoHS directive 2002/95/EC.

Technology-wise, Ericsson's PKM5000D is based on a multi-layer PCB integrated transformer technology, and its power train and secondary synchronous-rectifiers have been optimized to accommodate switching parameters to meet the very specific constraints inherent to an ultra-wide input range.

PKM5000D is the result of combined disciplines developed at Ericsson Power Modules but equally, it is an illustration of the company's R&D flexibility in combining its resources in Sweden and China. The converter has been fully designed, verified, and qualified to comply with Ericsson's design for manufacturing principles, which includes design optimisation to reduce energy consumption in manufacturing, transportation and to make the product easy to recycle when reaching end-of-life.