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MC34670 usage, configuration

Posted: 25 Mar 2009     Print Version  Bookmark and Share

Keywords:MC34670  DC/DC converter  Powered Devices 

This document by Freescale shows how to configure MC34670 to comply with the IEEE 802.3af standard and how to set-up the DC/DC converter part of the IC. This IC combines a power interface port for IEEE 802.3af Powered Devices (PD) and a high performance current mode switching regulator. It allows Freescale to build PDs with a minimum of external components by means of integrating the required IEEE 802.3af functions, and all functions necessary to build a high efficiency DC/DC converter.

This document shows a simple 1-port PoE system, comprising a PSE Hub or Switch (PSE—Power Sourcing Equipment) and an Ethernet appliance or PD. The PoE technology allows transmitting of power along with data over existing Cat5/Cat5e/Cat6 cables in a safe and reliable manner.

It can be used to power e.g. IP Phones, WLAN Access Points, network cameras, and various other network terminals that are in the allowed power range of 13 W, as measured at the PD side. Power-over-Ethernet is also known as Power over LAN. It is based on the IEEE 802.3af Standard.

View the PDF document for more information.

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