The document describes a Power over Ethernet isolated power supply that delivers 11.5W at 90% efficiency. It is designed for powering IP telephones, wireless access points, PDA charging stations, and other devices, complying with the IEEE 802.3af standard.
The document details a power supply design intended for Power over Ethernet (PoE) systems, specifically targeting Class 3 devices requiring between 6.49W and 12.95W. It proposes using the LT1725 switching regulator controller with an isolated synchronous flyback topology to maximize efficiency and minimize component count by eliminating the need for an optocoupler.
The design delivers 11.5W at 90% efficiency.
The circuit operates with an input range of 36V to 72V.
The circuit provides 3.3V at 3.5A.