LM5071 - Power Over Ethernet PD Controller with Auxiliary Power Interface from the PowerWise® Family

Datasheet Packaging Samples & Pricing Eval. Boards Design Tools Models Application Notes Knowledge Base

Features
•Compatible with 12V ac adapters
•Fully Compliant 802.3af Power Interface Port
•80V, 1, 400 mA Internal MOSFET
•Detection Resistor Disconnect Function
•Programmable Classification Current
•Programmable Under-voltage Lockout with Programmable Hysteresis
•Thermal Shutdown Protection
•Auxiliary Power Enable Pin
•Current Mode Pulse Width Modulator
•Supports both Isolated and Non-Isolated Applications
•Error Amplifier and Reference for Non-Isolated Applications
•Programmable Oscillator Frequency
•Programmable Soft-start
•80% Maximum Duty Cycle Limiter, Slope Compensation (-80 device)
•50% Maximum Duty Cycle Limiter, No Slope Compensation (-50 device)

General Description

The LM5071 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. More...


  Typical Application
*click for larger image


Parametric Table     expand
Parametric Table    collapse
Error Flag Yes
Output Range 1.25 and above
Output Power 13 Watt
Input Min Voltage 9.5 Volt
Input Max Voltage 60 Volt
Frequency Min 50 kHz
Frequency Max 1000 kHz
Reference Accuracy (+/-) 2 %
Current Draw with AUX Winding (typ) 0.7 mA
Special Features Auxiliary power interface, Fully compliant IEEE 802.3af PD interface, Error amplifier for non-isolated designs, leading edge blanking, high current gate drive
On/Off Pin Yes
Error Flag Yes
Adjustable Output Yes
Output Min 1.25 Volt
Output Range 1.25 and above
Output Power 13 Watt
Adj Switch Frequency Yes
Efficiency (peak) 90.5 %
Topology Single Ended
Flyback Yes
Inverting Yes
Step-Up Yes
Step-Down Yes
RegType Switching Controller
Temperature Min -40 deg C
Temperature Max 125 deg C
PowerWise Yes
View Using Catalog


Typical Performance

click for larger image


  Also Recommended
LM5068Negative Voltage Hot Swap Controller
LM5070Integrated Power Over Ethernet PD Interface And PWM Controller
LM5072Higher Transient Voltages (100V), Supplies More Current (750mA) And Compatible With Auxiliary Power

Additional Resources

Design Tools (see below)

Application Notes (see below)


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM5071 Power Over Ethernet PD Controller with Auxiliary Power Interface 859 Kbytes 4-Jan-06 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM5071EVALPower Over Ethernet PD Controller with Auxiliary Power InterfaceFull productionLM5071_PSPICE_0316.zip
 
Buy Now 		1+$123.001-
8 weeksN/A
LM5071MT-50TSSOP16NOPB1260RoHS Download Full productionLM5071_PSPICE_0316.zip
Samples
Buy Now 		1K+$1.45rail
of
92		NSUZXYTT
5071MT
-50
6 weeks500
LM5071MT-80TSSOP16NOPB1260RoHS Download Full productionLM5071_PSPICE_0316.zip
Samples
Buy Now 		1K+$1.45rail
of
92		NSUZXYTT
5071MT
-80
6 weeks1000
LM5071MTX-50TSSOP16NOPB1260RoHS Download Full productionLM5071_PSPICE_0316.zip
 
Buy Now 		1K+$1.45reel
of
2500		NSUZXYTT
5071MT
-50
6 weeks5000
LM5071MTX-80TSSOP16NOPB1260RoHS Download Full productionLM5071_PSPICE_0316.zip
 
Buy Now 		1K+$1.45reel
of
2500		NSUZXYTT
5071MT
-80
6 weeks5000

General Description

The LM5071 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5071 is specifically designed for the PD that must accept power from auxiliary sources such as ac adapters. The auxiliary power interface of the LM5071 activates the PWM controller when the ac adapter is connected to power the PD when PoE network power is unavailable. The LM5071 integrates an 80V, 400mA line connection switch and associated control for a fully IEEE 802.3af compliant interface with a full featured current mode pulse width modulator dc-dc converter. All power sequencing requirements between the controller interface and switch mode power supply (SMPS) are integrated into the IC.

Design Tools

TitleSize in Kbytes Date Click link below to Download    
LM5071 PSPICE model 284 Kbytes 18-Mar-2009 View Download  
Get The Scoop On How To Power Share Between Isolated PoE Channels     View    

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1430: Application Note 1430 LM5071 Evaluation Board 738 Kbytes 4-Jan-06 Download
AN-1474: Application Note 1474 The LM507X Family of PoE Devices: Frequently Asked Questions (FAQs) 457 Kbytes 10-May-06 Download
AN-1474 (Chinese): Application Note 1474 The LM507X Family of PoE Devices: Frequently Asked Questions (FAQs)
 388 Kbytes  

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge 230 Kbytes 2-Jul-08 Download
AN-1574: Application Note 1574 LM5073 Evaluation Board 464 Kbytes 24-Apr-07 Download
AN-1455: Application Note 1455 LM5072 Evaluation Board 708 Kbytes 30-Mar-06 Download
AN-1455 (Chinese): Application Note 1455 LM5072 Evaluation Board
 600 Kbytes  
AN-1358: Application Note 1358 LM5070 'AE' Evaluation Board 787 Kbytes 27-Jan-05 Download
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865 1072 Kbytes 10-Jan-06 Download
AN-1408 (Chinese): Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865
 697 Kbytes  
AN-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide 14913 Kbytes 4-Apr-08 Download
AN-1346: Application Note 1346 LM5070 'HE' Evaluation Board 550 Kbytes 13-Mar-06 Download
AN-1346 (Chinese): Application Note 1346 LM5070 'HE' Evaluation Board
 399 Kbytes  

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[Information as of 5-Jul-2009]