Texas Instruments AN-1521 POEPHYTEREV-I User Manual

AN-1521 POEPHYTEREV-I / -E Evaluation Board
1 Introduction
The POEPHYTEREV-I/-E evaluation board is a seamless design demonstrating Texas Instruments
LM5072 PoE product (capable of up to 24W) and DP83848I (single port 10/100Mb/s) Ethernet PHYTER®
product. While both the LM5072 and the DP83848 Ethernet PHY device have many advanced and
enticing features, this specific board is designed to demonstrate a subset of those features, specifically
Power over Ethernet. Two versions of this board are available. The –I version has an RJ-45 connector that
with integrated Ethernet magnetics. The –E version has discrete RJ-45 connector and Ethernet magnetics.
The schematics of the board are available with this kit for duplication into an end application product.
For additional features of the PoE and PHY devices, individual device evaluation boards are separately
available. For detailed information about the complete functions and features of the LM5072 or DP83848
devices, refer to the relevant data sheets. For applications where IEEE 802.3af must be complied with and
the power level is below 12.95W, refer to AN-1455 LM5072 Evaluation Board (SNVA154). For detailed
information about the Ethernet PHYTER® circuit, refer to AN-1469 PHYTER® Design & Layout Guide
(SNLA079).
This evaluation kit contains:
• POEPHYTEREV-I or –E Evaluation board
• Printed copy of this User's Guide
• Board schematic
• End User Licensing Agreement (EULA)
2 Scope of Applications
The POEPHYTEREV-I/-E evaluation kit (EK) is designed for high power PD (PoE terminology - Powered
Device) applications in which the maximum power exceeds the IEEE 802.3af's 12.95W limit. The
evaluation board features TI™'s DP83848 10/100 Mb/s PHYTER® Ethernet Physical Layer Transceiver,
so any equipment that provides a standard IEEE 802.3, Clause 22 MII DTE interface; e.g.
SmartBits/Netcom box, is required as a data source for the Ethernet device. The LM5072 is a 100V, high
power PoE PD and PWM controller. The evaluation board is capable of operating with both PoE and
auxiliary (AUX) power sources. The dc-dc converter stage of the power supply is implemented in the
versatile flyback converter topology.
3 Important Note on Circuit Board Versions
There are two versions of PCBs being built, which can be identified by the PCB serial number printed
along the left edge of the top side the circuit board. One version is labelled 551012916-001 Rev A, the
other 551013040-001 Rev A. The first version cannot modify the 3.3V output to higher voltages because it
is directly connected to the PHY through inner layers. It is modified on the second version such that higher
output voltage can be produced without damaging the PHY circuit. The factory default output setting for
both versions is 3.3V. Contact TI on support to modify the latter version to other output voltage.
In the following, descriptions apply to both versions of the circuit boards unless specifically indicated.
TI is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
SNOA476C – October 2006 – Revised April 2013
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Copyright © 2006–2013, Texas Instruments Incorporated
SNOA476C – October 2006 – Revised April 2013
AN-1521 POEPHYTEREV-I / -E Evaluation Board
User's Guide
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