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May 2015 DocID026206 Rev 1 1/30
AN4473
Application note
PoE synchronous flyback, IEEE802.3at compliant, 5V - 4A PD
converter based on the PM8803 controller
Antonio Rotta
Introduction
This document describes a reference design for a POE+, high efficiency, 5 V - 4 A flyback
converter based on the PM8803 PoE controller.
The PM8803 is a highly integrated device embedding an IEEE802.3at compliant “Powered
Device” (PD) interface together with a PWM controller and support for auxiliary sources.
The STEVAL-TSP004V2 reference design is based on an isolated flyback topology CCM
converter with synchronous rectification with a gate driver transformer. The same PCB can
be populated in different ways to support various configurations and topologies (the flyback
with diode rectification, synchronous flyback with or without an active clamp, self-driven
synchronous flyback).
Figure 1. STEVAL-TSP004V2 evaluation board photo
www.st.com
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