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DC/DC converter module delivers power up to 50W

Posted: 15 Apr 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Ericsson? power module? Power-over-Ethernet?

Ericsson has expanded its PKU family with a power module that integrates ultra-wide voltage input ranging from 18V to 75Vaccommodating both telecom system bus voltages of 24V and 48V and supplying voltages to Power-over-Ethernet applications including remote antennas, WIFI repeaters, basestation microcells, CCTV/camera monitoring systems and a variety of different sensors.

The PKU5510E is a 50W DC/DC converter module that combines the thermal enhancements integrated in the recently announced PKU4116C module together with an optimised fly-forward topology.

The module delivers an output current of 15A at 3.3V output and has a built-in functional isolation of 2250Vdc that meets the requirements specified by the IEEE802.3 Ethernet networking standard, as well as that of IEC/EN/UL60950 basic insulation.

Due to its ultra-wide input and high efficiency, the device also powers industrial applications and many others that use remote power feeds, where a module is required to operate irrespective where it is connected or indeed of the length of the line cable. Its wide input range offers another benefit for applications that require a hold-up capacitor to prevent the loss of vital data in the case of line disruption. As the module can operate at 18V, a hold-up capacitor can maintain voltage for a longer period of time.

Ericsson PKU4116C

The module embeds a unique overload protection system for applications that are subject to peak currents and environment with very low natural convection or airflow. To have the overload protection prevent false triggering while simultaneously guaranteeing reliable protection from overloading, two Over-Current Protection (OCP) methods are combined. In the case of a short-duration overload, the hiccup-mode OCP uses a tightly controlled cycle-by-cycle current limitation; and in the case of longer overload, the hiccup-mode OCP will trigger for conventional hiccup protection.

Protection is not limited to two hiccup modes, as the hiccup activation time is proportional to temperature and becomes shorter with an increase in temperature, thereby limiting the energy dissipated during this period. Following activation of the Over-Temperature Protection (OTP), the module checks the OTP threshold to prevent any restart that could damage the module.

Available in an industry-standard sixteenth-brick footprintwith dimensions of 33mmx22.9mm and a low-profile height of 9.4mm, the device delivers up to 50W, and provides up to 92 per cent efficiency at 50 per cent load and 27V input, guaranteeing low power dissipation and reduced energy consumption.

With natural convection, the module delivers full performance up to 80C; and under 3.0m/sec convection cooling, full power can be delivered up to 96C. Offering an MTBF (Mean-Time-Before-Failure) of 4.9 million hours, the PKU5510E meets safety requirements according to IEC/EN/UL 60950-1 and offers input/output isolation of 2250Vdc.

- Graham Prophet
??EE Times Europe

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