Power over Ethernet isolated power supply delivers 11.5W at 90% efficiency
Jesus Rosales
Abstract
A Power over Ethernet isolated power supply that delivers 11.5W at 90% efficiency is described.
Keywords
Power over Ethernet
LT1725 switching regulator controller
flyback controller
When powering IP telephones, wireless access points, PDA charging stations and other PDs (Powered Devices) from an Ethernet cable, designers have at most 12.95W of available power per the IEEE 802.3af standard. Increased demands for power mandate a very efficient power converter especially for class 3 devices (consuming between 6.49W and 12.95W). The more power lost in the converter, the less power available for the PD.
The voltage available from ...
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