May 2014

DocID025410 Rev 1

1/29

AN4377

Application note

Power over Ethernet - PD converter with 5 V 2 A output,

standard IEEE 802.3af compliant

Antonio Rotta

Introduction

This document focuses on a product evaluation board for a simple, low cost 5 V 2 A flyback

converter based on the PM8800A device.

The PM8800A is a highly integrated device embedding an IEEE 802.3af compliant

“Powered Device” (PD) interface together with a PWM controller.

It can be successfully used in all low power, low cost PoE applications.

Figure 1. STEVAL-TSP005V2 demonstration board photo

www.st.com