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50W DC/DC converter geared for PoE apps

Posted: 15 Apr 2014     Print Version  Bookmark and Share

Keywords:Ericsson  PoE  DC/DC converter  power module  telecom 

Ericsson has announced a 50W DC/DC converter module intended for Power-over-Ethernet (PoE) applications. The device supports an input range from 18-75V, which allows the converter to be used in 24V or 48V telecom systems.

The module is the latest evolution of Ericsson's PKU family and combines the thermal enhancements integrated in the recently announced PKU4116C module together with an optimised fly-forward topology, which was first introduced by Ericsson in 2008. It reduces inventories and is also suitable for remote power feed applications, added the company.

PKU4116C

The PKU5510E 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, and also meets Basic Insulation requirements according to IEC/EN/UL60950.

The PKU5510E has been designed for applications that have to accommodate both telecom system bus voltages of 24V and 48V, and also able to supply voltages to PoE based applications such as remote antennas, WiFi repeaters, base station microcells, CCTV/camera monitoring systems and a variety of different sensors.

Due to its ultra-wide input and high efficiency, the PKU5510E is also an ideal solution to power 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, stated Ericsson. The wide input range of PKU5510E 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. Because of the module's wide range of operation, this can reduce the amount of capacitance required.

Designed for applications that are subject to peak currents and environment with very low natural convection or airflow, the PKU5510E embeds a unique overload protection system. In these types of applications, the overload protection must prevent false triggering while simultaneously guaranteeing reliable protection from overloading. A solution for this complex situation has been achieved by combining two Over-Current Protection (OCP) methods. 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 footprint, with dimensions of 33 x 22.9mm 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 80°C; and under 3m/s convection cooling, full power can be delivered up to 96°C. Offering a Mean-Time-Before-Failure (MTBF) of 4.9 million hours, the PKU5510E meets safety requirements according to IEC/EN/UL 60950-1 and offers input/output isolation of 2.25kVDC.

- Graham Prophet
  EE Times Europe





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