LM5072   
Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support from the PowerWise® Family		 Click link to Download

Features PD InterfacePWM Controller
•Fully Compliant IEEE 802.3af PD Interface
•Versatile Auxiliary Power Options
•9V Minimum Auxiliary Power Operating Range
•100V Maximum Input Voltage Rating
•Programmable DC Current Limit Up To 800mA
•100V, 0.7Ω Hot Swap MOSFET
•Integrated PD Signature Resistor
•Integrated PoE Input UVLO
•Programmable Inrush Current Limit
•PD Classification Capability
•Power Good Indicator
•Thermal Shutdown Protection
•Current Mode PWM Controller
•100V Start-up Regulator
•Error Amplifier with 2% Voltage Reference
•Supports Isolated and Non-Isolated Applications
•Programmable Oscillator Frequency
•Programmable Soft-Start
•800 mA Peak Gate Driver
•80% Maximum Duty Cycle with Built-in Slope Compensation (-80 device)
•50% Maximum Duty Cycle, No Slope Compensation (-50 device)

Description

The LM5072 Powered Device (PD) interface and Pulse-Width-Modulation (PWM) controller provides a complete power solution, fully compliant to IEEE 802.3af, for the PD connecting into Power over Ethernet (PoE) networks. This controller integrates all functions necessary to implement both a PD powered interface and DC-DC converter with a minimum number of external components. The LM5072 provides the flexibility for the PD to also accept power from auxiliary sources such as AC adapters in a variety of configurations. The low RDS(ON) PD interface hot swap MOSFET and programmable DC current limit extend the range of LM5072 applications up to twice the power level of 802.3af compliant PD devices. The 100V maximum voltage rating simplifies selection of the transient voltage suppressor that protects the PD from network transients. The LM5072 includes an easy-to-use PWM controller that facilitates the various single-ended power supply topologies including the flyback, forward and buck. The PWM control scheme is based on peak current mode control, which provides inherent advantages including line feed-forward, cycle-by-cycle current limit, and simplified feedback loop compensation. Two versions of the LM5072 provide either an 80% maximum duty cycle (-80 suffix), or a 50% maximum duty cycle (-50 suffix).

Applications
•IEEE 802.3af Compliant PoE Powered Devices
•Non-Compliant, Application Specific Devices
•Higher Power Ethernet Powered Devices
Also Recommended
LM5070▲Integrated Power Over Ethernet PD Interface And PWM Controller
LM5071▲Compatible With Auxilary Power Sources, Such As 12 V AC Adapters
LM5073▲100V PoE PD Interface For Flexible DC-DC Regulator Selection



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Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM5072 LM5070 LM5071 LM5073
Input Min Voltage9 Volt 1.8 Volt 9.5 Volt 9 Volt
Input Max Voltage100 Volt 75 Volt 60 Volt 100 Volt
Frequency Min50 kHz 50 kHz 50 kHz
Frequency Max1000 kHz 1000 kHz 1000 kHz
Reference Accuracy (+/-)2 % 2.0 % 2 %
Current Draw with AUX Winding (typ)0.7 mA 0.7 mA 0.7 mA
Special Features100V PD hot swap MOSFET, adjustable DC current limit, Auxiliary power interface Fully compliant IEEE 802.3af PD interface, error amplifier for non-isolated designs, leading edge blanking, high current gate drive Auxiliary power interface, Fully compliant IEEE 802.3af PD interface, Error amplifier for non-isolated designs, leading edge blanking, high current gate drive IEEE 802.3af Compliant PD Interface, High Power PD Interface, 100V Hot Swap MOSFET, Adjustable DC Current Limit, Aux Power Interface
On/Off PinYes Yes Yes
Error FlagYes No Yes
Adjustable OutputYes Yes Yes
Output Min1.25 Volt 1.25 Volt 1.25 Volt
Output Range1.25V and above 1.25V and above 1.25 and above
Output Power25 Watt 13 Watt 13 Watt 25 Watt
Adj Switch FrequencyYes Yes Yes
Efficiency (peak)90.5 % 90.5 % 90.5 %
TopologySingle Ended Single Ended Single Ended Any DC-DC Converter Toplogy
FlybackYes Yes Yes Yes
InvertingYes Yes Yes Yes
Step-UpYes Yes Yes Yes
Step-DownYes Yes Yes Yes
RegTypeSwitching Controller Switching Controller Switching Controller Hot Swap Controller
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C
PowerWiseYes Yes Yes Yes

Datasheet
TitleSizeDateOther
Language
LM5072 Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support491
Kbytes		30-Oct-07 


Featured Application Notes
TitleSizeDateOther
Language
AN-1474: Application Note 1474 The LM507X Family of PoE Devices: Frequently Asked Questions (FAQs)457
Kbytes		10-May-06 中文
AN-1455: Application Note 1455 LM5072 Evaluation Board708
Kbytes		30-Mar-06 中文
AN-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide14913
Kbytes		4-Apr-08 
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge230
Kbytes		2-Jul-08 
AN-1430: Application Note 1430 LM5071 Evaluation Board738
Kbytes		4-Jan-06 
AN-1574: Application Note 1574 LM5073 Evaluation Board464
Kbytes		24-Apr-07 


More Application Notes
TitleSizeDateOther
Language
AN-1358: Application Note 1358 LM5070 'AE' Evaluation Board787
Kbytes		27-Jan-05 
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP838651072
Kbytes		10-Jan-06 中文
AN-1346: Application Note 1346 LM5070 'HE' Evaluation Board550
Kbytes		13-Mar-06 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM5072MH-50/NOPB

RoHS



TSSOP EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide8
DIGIKEYWorldwide162
FARNELLEurope and Asia109
FUTUREWorldwide29
NEWARKAmericas152
RS COMPONENTSWorldwide25
$1.85 each at 1K+ pcsrail
of
92
LM5072MH-80/NOPB
LM5072MH-80

RoHS



TSSOP EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide445
AVNET-EMWorldwide45
DIGIKEYWorldwide1328
FARNELLEurope and Asia696
NEWARKAmericas84
RS COMPONENTSWorldwide53
$1.85 each at 1K+ pcsrail
of
92
LM5072MHX-50/NOPB

RoHS



TSSOP EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
TECHMOSAAsia Pacific5655
$1.85 each at 1K+ pcsreel
of
2500
LM5072MHX-80/NOPB

RoHS



TSSOP EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide1100
$1.85 each at 1K+ pcsreel
of
2500

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM5072EVAL
Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux SupportFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide10
$134.00 each1

LM5072 Integrated 100V Power Over Ethernet PD Interface and PWM Controller

Features:

  • Fully compliant IEEE 802.3af PD Power Interface
  • Versatile Auxiliary Power options
  • 100V maximum input voltage rating
  • 9V minimum operating input voltage (Auxiliary Power)
  • Integrated PD signature resistor
  • Integrated PoE input UVLO
  • Programmable inrush current limit
  • Programmable DC current limit
  • PD classification capability
  • Power good indicator
  • Thermal shutdown protection

Applications:

  • IEEE 802.3af compliant PD devices
  • Non-compliant, application specific PD devices
  • Higher Power PoE PD devices

Contents:

  • A fully assembled LM5072 evaluation board
  • LM5072 datasheet
  • LM5072 evaluation board appnote

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
POEPHYTEREV-E
Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux SupportFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide4
$199.00 each1

Features:

This POEPHYTEREV-E board is a seamless design demonstrating National's LM5072 PoE product (capable of 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 a RJ-45 connector that with integrated Ethernet magnetics. The -E version has discrete RJ-45 connector and Ethernet magnetics. For detailed information about the complete functions and features of the LM5072 and DP83848 devices, refer to the relevant datasheets.

Ethernet:

  • RJ45 Jack with External Magnetics and series resistors
  • DP83848I (drop-in compatible with DP83848C)
  • 3 PHY Status LEDs
  • Connections for the following interfaces:
         - MII/RMII Interface (IEEE 802.3 defined connector)
         - RJ-45 Cat-V Ethernet cable connector
         - JTAG header
         - 25MHz_OUT header
         - Header for "ribbon cable" connection to MII/RMII
  • On-board clock - Crystal/Oscillator Dual Footprint

Power Over Ethernet:

  • Isolated output voltage 3.3V
  • Maximum output current: 7.3A
  • Maximum output power: 24W
  • Input voltage ranges:
         - PoE input voltage range: 39 to 57V
         - AUX input voltage range: 22 to 57V
  • Measured maximum efficiency
         - DC to DC converter efficiency: 90% at 6A
         - Overall efficiency (including the input diode bridge): 86% at 6A
  • Overall Board Size: 5.50" x 3.96" x 0.70"
  • Switching frequency: 250 kHz
  • Optional input common-mode filter

Applications:

High Power PD (PoE Terminology - Powered Device) applications in which the maximum power exceeds
the IEEE 802.3af's 12.95W limit)

Related Parts:

  • LM5072 - Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support
  • Phyter Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
    • DP83848C Commercial Temperature, LQFP Package
    • DP83848I Industrial Temperature, LQFP Package
    • DP83848YB Extreme Temperature, LQFP Package
    • DP83848M Commercial Temperature, Mini LLP Package
    • DP83848T Industrial Temperature, Mini LLP Package
    • DP83848H Extreme Temperature, Mini LLP Package
    • DP83848J Commercial Temperature, Mini LLP Package with Link and Speed LED Indicators
    • DP83848K Industrial Temperature, Mini LLP Package with Link and Speed LED Indicators

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
POEPHYTEREV-I
Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux SupportFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide10
$199.00 each1

Features:

This POE_PHYTEREV-I board is a seamless design demonstrating National's LM5072 PoE product (capable of 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 a RJ-45 connector that with integrated Ethernet magnetics. The -E version has discrete RJ-45 connector and Ethernet magnetics. For detailed information about the complete functions and features of the LM5072 and DP83848 devices, refer to the relevant datasheets.

Ethernet:

  • Bel-Stewart Integrated RJ45 Jack
  • DP83848I with (drop-in compatible with DP83848C)
  • 3 PHY Status LEDs
  • Connections for the following interfaces:
         - MII/RMII Interface (IEEE 802.3 defined connector)
         - RJ-45 Cat-V Ethernet cable connector
         - JTAG header
         - 25MHz_OUT header
         - Header for "ribbon cable" connection to MII/RMII
  • On-board clock - Crystal/Oscillator Dual Footprint

Power Over Ethernet:

  • Isolated output voltage 3.3V
  • Maximum output current: 7.3A
  • Maximum output power: 24W
  • Input voltage ranges:
         - PoE input voltage range: 39 to 57V
         - AUX input voltage range: 22 to 57V
  • Measured maximum efficiency
         - DC to DC converter efficiency: 90% at 6A
         - Overall efficiency (including the input diode bridge): 86% at 6A
  • Overall Board Size: 5.50" x 3.96" x 0.70"
  • Switching frequency: 250 kHz
  • Optional input common-mode filter

Applications:

High Power PD (PoE Terminology - Powered Device) applications in which the maximum power exceeds
the IEEE 802.3af's 12.95W limit)

Related Parts:

  • LM5072 - Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support
  • Phyter Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
    • DP83848C Commercial Temperature, LQFP Package
    • DP83848I Industrial Temperature, LQFP Package
    • DP83848YB Extreme Temperature, LQFP Package
    • DP83848M Commercial Temperature, Mini LLP Package
    • DP83848T Industrial Temperature, Mini LLP Package
    • DP83848H Extreme Temperature, Mini LLP Package
    • DP83848J Commercial Temperature, Mini LLP Package with Link and Speed LED Indicators
    • DP83848K Industrial Temperature, Mini LLP Package with Link and Speed LED Indicators

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM5072MH-50ABCD150XV2036010011554964327875145
LM5072MH-80ABCD150XV2036010011554964327875145
LM5072MHX-50ABCD150XV2036010011554964327875145
LM5072MHX-80ABCD150XV2036010011554964327875145

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 20-Nov-2009]