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PoE interface modules drive down component count, cost

Posted: 10 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:NMPD? interface module? powered device? C&D Technologies? PD?

C&D Technologies launched a family of fully-integrated powered device (PD) interface modules that aim to reduce component count, design time and installation cost of Power-over-Ethernet (PoE) applications. The NMPD series of compact power extraction modules feature on-board DC/DC conversion, and provide a IEEE802.3af-compliant data and power interface to an Ethernet line, including short-circuit protection.

The modules are suitable 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.

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.

The modules in the NMPD series incorporate an LED to indicate output voltage presence. They come with on-board thermal shutdown and overcurrent protection. 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 91.8-by-25.1mm. The parts will operate at full load in ambient temperatures ranging from 40C to 60C.

Unit pricing for the NMPD series is less than $18 in OEM quantities.

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