AN2487 datasheet(1/32 Pages) STMICROELECTRONICS

Part #	AN2487

Description	power over Ethernet powered device demonstration board

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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August 2008

Rev 2

1/32

AN2487

Application note

STEVAL-TSP001V1

power over Ethernet powered device demonstration board

Introduction

This application note describes the STEVAL-TSP001V1 demonstration board for the

evaluation of a power over Ethernet (PoE) system used to transmit electrical power, along

with data, to remote devices over a standard twisted-pair cable in an Ethernet network.

A complete power solution for Ethernet-connected powered devices is presented. The

power supply fully complies with IEEE 802.3-2005 PoE specifications and delivers the rated

output from any compliant source.

Example outputs of 3.3 V and 12 V are given in this document, but other requirements can

easily be met by implementing small changes.

Key features

■ Low profile, small size: 5"w x 1.5"d x 0.65"h (0.5" except RJ-45 Ethernet connectors)

■ Complies with all IEEE 802.3-2005 (IEEE 802.3af) Power over Ethernet specifications

■ Respects source limitations

■ Does not pollute power source

■ 1500 V isolated outputs eliminate ground loops

■ Highest possible economical output power (total power at output approximately 10 W)

■ Useful output voltages

– 12 V @0.65 A output (7.8 W, loose tolerance)

– 3.3 V @0.65 A output (2.145 W, tight tolerance)

■ Increased cost-effectiveness due to SMT construction (through-hole connectors for

ruggedness)

www.st.com

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