C&D Technologies has launched a family of fully integrated Powered Device (PD) interface modules that will significantly reduce component count, design time and installation cost of Power over Ethernet (PoE) applications. The NMPD series of compact power extraction modules are the industry’s first PD interfaces to feature on-board DC/DC conversion, and provide a full IEEE802.3af-compliant data and power interface to an Ethernet line including short-circuit protection.

The NMPD modules are ideal for PoE designs in applications ranging from security equipment and public address systems to remote environmental monitoring, telemetry and industrial control. Operating with a maximum output power rating of 10W, the modules extract power from a CAT5 twisted pair Ethernet cable when sourced by IEEE802.3af-compliant power sourcing equipment (PSE).

Each module integrates data isolation transformers, PSE handshaking and signature control functionality, and a UL-approved DC/DC converter delivering an isolated DC output voltage. As a result, the need for external power sources and isolation transformers is eliminated. Typical signature resistance and signature capacitance is 25kΩ and 100nF respectively, while classification current is 4mA.

The new modules work with a nominal 48V input voltage and are available with isolated output voltage options of 3.3V, 5V, 12V and 15V. Isolation is rated at 1500VAC (for one minute). In accordance with the IEEE802.3af standard, NMPD PD interfaces draw power from the Ethernet data lines or spare pair wires.

All of the modules in the NMPD series incorporate an LED to indicate output voltage presence, while on-board thermal shutdown and overcurrent protection further reduces the need for external components. A module enters overcurrent mode when maximum output power is exceeded, and automatically recovers when the overload condition is removed.

NMPD modules are supplied in a compact, vertically mounted SIP form factor with dimensions of just 91.8mm x 25.1mm. The parts will operate at full load in ambient temperatures ranging from -40°C to 60°C.

C&D Technologies Inc, Milton Keynes, UK 19th February 2007