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PoE+ circuit delivers 13W to 70W for powered devices

Posted: 15 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PoE+? PSE? converter? powered device?

Applications in the rapidly expanding PoE industry now demand power levels higher than the 12.95W supported by the current IEEE 802.3af standard. Accordingly, in September 2005 the IEEE began creating a new standard (IEEE 802.3at) that will extend the power delivered through Ethernet cables to at least 30W. Expected to be finalized in Q2 2008, the new PoE Plus (PoE+) standard will approximately double the power available to powered devices (PDs).

While waiting for IEEE 802.3at to be ratified, however, the industry needs "pre-PoE+" circuitry to meet the demands of current applications. This article presents a simple PD operating at a PoE+ power level (30W), with the aid of an external MOSFET and a controller designed for the older 802.3af standard.

View the PDF document for more information.




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