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  Implementing PoE - Chips and Chipsets
Part One of this series covered the fundamentals of Power over Ethernet (see Electronic Products, October 2005, p. 37). This second of three articles deals with the components you'll need to consider when developing a device for PoE applications




  Configurable xformer meets RoHS directive
RoHS-compliant, the Coiltronics PoE configurable transformer accommodates multiple output variations and is rated to 26 W.

  Half-brick drives PoE hub power
Addressing the increasing demand for internal power over Ethernet (PoE) solutions, the C half-brick dc/dc converter able to drive up to 13 PoE-enabled devices at the specified maximum of 12.95 W.

  PoE injector yields up to 50 W
Housed in an impact-resistant nonvented polycarbonate case with thermal conduction cooling, a desktop/wall plug PoE injector can provides a regulated output from 3.3 to 48 V at up to 50 W.

  Power transformers suit PoE applications
Available in 22 versions, the PoE Series power transformers suit PD-side Power over Ethernet products that meet IEEE 802.3af.

  PoE midspans address VoIP
Available in 1-, 8-, 16- and 24-port versions, a family of 802.3af-compatible midspans delivers 15.4 W per port to implement power over Ethernet into an existing network for VoIP applications.

  Half-brick suits PoE hub power
Addressing the increasing demand for internal power over Ethernet (PoE) solutions, the C half-brick dc/dc converter can drive up to 13 PoE-enabled devices at the specified maximum of 12.95 W.

  PoE midspan serves 12 ports
Supporting pre-standard terminals as well as legacy Ethernet switches, the 3012 PoE midspan is a 12-port power injector fully compliant with the 902.3af standard.

  Supply fills PoE apps
Delivering 657 W of 802.3af-compliant power along with an isolated 12-V output, the DS657 ac/dc power supply is well suited for endspan and midspan PoE implementations.

  1U front end fits PoE apps
Provides 1,000 W with an input from 180 to 264 Vac and 800 W with from 90 to 264 Vac, the LC Series 1U ac/dc front-end power supply is 802.3af compliant.

  100-V PoE controller suits IP phones and WLAN systems
The TPS23750 PoE controller combines the functionality of the company's TPS2375-powered device controller with a primary-side dc/dc PWM controller.




  Pondering PoE
Aside from the fact that Power over Ethernet can provide power to network devices right across the Cat-5 cables, many have a limited understanding of the standards and implementation involved. The benefits of supplying power over the Ethernet cable cannot be ignored.

  Implementing high-power PoE
Power-over-Ethernet (PoE) allows power and data to be carried over a single Ethernet cable, so a device can operate solely from the power it receives through the data cable. This innovation allows greater flexibility in office design, higher efficiency in systems design, and faster turnaround time in set-up and implementation.




  Micrel Makes Major In-Roads With Quadruple Play Ethernet Solution
The KSZ8842-PMQLI Ethernet IC has been integrated into the new AMD Geode™ LX EPIC Reference Design Kit (RDK). The KSZ8842-PMQLI is the industry's first 2-port Ethernet switch with 32-bit PCI bus interface in an industrial temperature grade. The Ethernet solution, launched in September 2005, is aimed at embedded and industrial networking applications.

  Micrel Rolls Out Four New IC Solutions For Embedded and Industrial Ethernet Applications
The KSZ884x series is part of the 2-port and 3-port Switch/Repeater family launched in June and July of 2005 and round out the Company's Embedded Ethernet offerings.

  Micrel's Complete Line of Ethernet Products
Including Fast Ethernet Media and Embedded Controllers, Fast Ethernet Transceivers and Switches, and System On a Chip.




  Ethernet Application Notes


  Ethernet White Papers


  Ethernet Technical Support






  Foundry Services

  Application Hints

About Micrel, Inc.
Micrel Inc., is a leading global manufacturer of IC solutions for the worldwide analog, Ethernet and high bandwidth markets. The Company's products include advanced mixed-signal, analog and power semiconductors; high performance communication, clock management, Ethernet switch and physical layer transceiver ICs.

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