UM1062 datasheet(1/31 Pages) STMICROELECTRONICS

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UM1062 Datasheet(PDF) 1 Page - STMicroelectronics

Part #	UM1062

Description	The PM8803 is a highly integrated device embedding

PDF	31 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

1 / 31 page

March 2011

Doc ID 018571 Rev 1

1/31

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 3 while the

related bill of material is detailed in Section 5. In Section 7 efficiency measurements

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

Figure 1.

EVALPM8803-FWD demonstration kit

www.st.com

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