Power module with ultra-wide voltage input for telecom and PoE

April 11, 2014 // By Graham Prophet
A 50W ultra-wide-input power module in sixteenth-brick footprint simplifies Power-over-Ethernet (PoE) applications; ultra-wide input voltage from 18V to 75V accommodates 24V and 48V systems, reduces inventories and is also suitable for remote power feed applications.

Ericsson has introduced a 50W DC/DC converter module that targets Power-over-Ethernet (PoE) applications. It has an input range of 18V to 75V, which means that the device is also suitable for 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.

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 Power-over-Ethernet based applications such as remote antennas, WIFI repeaters, basestation 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. 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