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UM1062: DescriptionThe PM8803 is a highly integrated device embedding; File Size1MB，31 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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UM1062 Overview

The PM8803 is a highly integrated device embedding

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UM1062

User manual

EVALPM8803-FWD: IEEE802.3at compliant demonstration kit

with synchronous active clamp forward converter

Introduction

The PM8803 is a highly integrated device embedding an IEEE802.3at-2009 compliant

powered device (PD) interface together with a PWM controller and support for auxiliary

sources.

Figure 1

is an image of the EVALPM8803-FWD PoE+ demonstration board. The

same PCB can be populated with different components to support various configurations

and options (active clamp forward both with synchronous rectification or with diode

rectification).

This document focuses on a reference design for PoE+ based on AC forward topology with

synchronous rectification, with the PM8803 as the main controller.

The schematics and board layout of the PoE+ section are given in

Section 2

and

while the

related bill of material is detailed in

Section 5.

Section 7

efficiency measurements

together with main waveforms of the PoE interface and AC forward converter are shown.

Figure 1.

EVALPM8803-FWD demonstration kit

March 2011

Doc ID 018571 Rev 1

1/31

www.st.com

List of figures

UM1062

List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Figure 17.

Figure 18.

Figure 19.

Figure 20.

Figure 21.

Figure 22.

Figure 23.

Figure 24.

Figure 25.

Figure 26.

Figure 27.

Figure 28.

EVALPM8803-FWD demonstration kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Demonstration kit schematic: detail of the PoE+ input section including data transformer,

diode bridges, protection, and optional CM choke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Demonstration kit schematic: detail of the PoE+ section based on AC forward topology

with synchronous rectification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Assembly view: top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Assembly view: bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Inner layer 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Inner layer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Efficiency measurements at 48 V input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DC-DC only efficiency measurements at different input voltages. . . . . . . . . . . . . . . . . . . . 20

Overall efficiency measurements at different input voltages. . . . . . . . . . . . . . . . . . . . . . . . 21

Efficiency measurements at 48 V input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

DC-DC only efficiency measurements at different input voltages. . . . . . . . . . . . . . . . . . . . 22

Overall efficiency measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Startup from an IEEE 802.3af injector with 2 A load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Startup from an IEEE 802.3at injector with 4 A load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Switching between PoE and auxiliary source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Primary side power MOSFET waveforms at 0 A load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Primary side power MOSFET waveforms at 4 A load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Secondary side power MOSFET waveforms at 0 A load . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Secondary side power MOSFET waveforms at 4 A load . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Effect of a 12 V line transient on the converter at 4 A load. . . . . . . . . . . . . . . . . . . . . . . . . 27

Effect of a 12 V line transient on the converter at 0 A load. . . . . . . . . . . . . . . . . . . . . . . . . 27

Response of the converter to a 2 A - 4 A load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Response of the converter to a 0 A - 4 A load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5 V output ripple measurement at 4 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5 V output ripple measurement at 4 A with infinite persistence . . . . . . . . . . . . . . . . . . . . . 29

4/31

Doc ID 018571 Rev 1

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