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User's Guide
SNVA154A–March 2006–Revised May 2013
AN-1455 LM5072 Evaluation Board
1 Introduction
The LM5072 evaluation board is designed to provide a low cost, fully IEEE 802.3af compliant Power over
Ethernet (PoE) power supply, capable of operating with both PoE and auxiliary (AUX) power sources. The
evaluation board features the LM5072 PoE Powered Device (PD) interface and controller integrated circuit
(IC) configured in the versatile flyback topology.
2 Features of the LM5072 Evaluation Board
• Single Isolated 3.3V output (see Figure 1)
• Dual Isolated 5V and 3.3V outputs supported (see Figure 15)
• Non-Isolated outputs supported (see Figure 16)
• Maximum output current 3A
• Input voltage range for maximum output current (as configured):
– With the installed wide-voltage-range EP13 transformer
– PoE input voltage range: 38 to 60V
– FAUX input voltage range: 24 to 60V
– RAUX input voltage range: 16 to 60V
– With the optional, efficiency-optimized EP13 transformer
– PoE input voltage range: 38 to 60V
– FAUX input voltage range: 24 to 60V
– RAUX input voltage range: 24 to 60V
• Measured maximum efficiency:
– With the installed wide-voltage-range EP13 transformer
– DC to DC converter efficiency: 81% at 3A
– Overall efficiency (including diode bridge): 78.5% at 3A
– With the optional, efficiency-optimized EP13 transformer
– DC to DC converter efficiency: 84% at 3A
– Overall efficiency (including diode bridge): 81.5% at 3A
• Board Size: 2.75 x 2.00 x 0.66 inches
• Operating frequency: 250 kHz
• PoE input under-voltage lockout (UVLO) release: 39V nominal
• PoE input UVLO hysteresis: 7V nominal
This application note focuses on the evaluation board. Please refer to the LM5072 Integrated 100V Power
Over Ethernet PD Interface and PWM Controller with Aux Support (SNV437) data sheet for detailed
information about the complete functions and features of the LM5072 IC.
All trademarks are the property of their respective owners.
1
SNVA154A–March 2006–Revised May 2013 AN-1455 LM5072 Evaluation Board
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Verzeichnis
- ・ Blockdiagramm on Seite 2 Seite 15
- ・ Anwendungsbereich on Seite 19
- ・ Elektrische Spezifikation on Seite 9 Seite 10 Seite 11 Seite 12 Seite 13
