LM5072 - Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

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

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

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)

General 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. More...

Applications

•	IEEE 802.3af Compliant PoE Powered Devices
•	Non-Compliant, Application Specific Devices
•	Higher Power Ethernet Powered Devices

Typical Application

*click for larger image

Parameters Values

Input Min Voltage 9 Volt

Input Max Voltage 100 Volt

Frequency Min 50 kHz

Frequency Max 1000 kHz

Reference Accuracy (+/-) 2 %

Current Draw with AUX Winding (typ) 0.7 mA

Special Features 100V PD hot swap MOSFET, adjustable DC current limit, Auxiliary power interface

On/Off Pin Yes

Error Flag Yes

Adjustable Output Yes

Output Min 1.25 Volt

Output Range 1.25V and above

Output Power 25 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

Typical Performance

*click for larger image

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

Additional Resources

Application Notes

Block Diagram

*click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM5072 Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support	491 Kbytes	30-Oct-07	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM5072EVAL

Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

Full production

LM5072_PSPICE_0316.zip

Buy Now

1+

$134.00

1

8 weeks

N/A

POEPHYTEREV-E

Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

Full production

N/A

Buy Now

1+

$199.00

1

8 weeks

N/A

POEPHYTEREV-I

Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

Full production

N/A

Buy Now

1+

$199.00

1

8 weeks

N/A

LM5072MH-50

16

NOPB

1

260

Full production

LM5072_PSPICE_0316.zip

Buy Now

1K+

$1.85

rail
of
92

NSUZXYTT
LM5072
MH-50

6 weeks

500

LM5072MH-80

16

NOPB
STD

1
1

260
260

Full production

LM5072_PSPICE_0316.zip

Buy Now

1K+

$1.85

rail
of
92

NSUZXYTT
LM5072
MH-80

6 weeks

1000

LM5072MHX-50

16

NOPB

1

260

Full production

LM5072_PSPICE_0316.zip

Buy Now

1K+

$1.85

reel
of
2500

NSUZXYTT
LM5072
MH-50

6 weeks

5000

LM5072MHX-80

16

NOPB

1

260

Full production

LM5072_PSPICE_0316.zip

Buy Now

1K+

$1.85

reel
of
2500

NSUZXYTT
LM5072
MH-80

6 weeks

3000

General 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).

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5072MH-50	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM5072MH-80	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM5072MHX-50	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM5072MHX-80	ABCD150XV2	0	3601	0	0	1155496	4	327875145

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.

Design Tools

Title	Size in Kbytes	Date
Power over Ethernet Consortium - Interoperability Test	563 Kbytes	17-Mar-2006	View Online	Download
Power over Ethernet Consortium - Clause 33 PD Conformance Test	450 Kbytes	17-Mar-2006	View Online	Download
LM5072 PSPICE model	284 Kbytes	18-Mar-2009	View	Download
Article - Get The Scoop On How To Power Share Between Isolated PoE Channels			View

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Reference Designs

•	RD-163 - LM5072 12Vout 25W PoE PD Power Eval-Board for IP Camera

Application Notes

Title	Size in Kbytes	Date
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
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-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide	14913 Kbytes	4-Apr-08	Download
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge	230 Kbytes	2-Jul-08	Download
AN-1430: Application Note 1430 LM5071 Evaluation Board	738 Kbytes	4-Jan-06	Download
AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07	Download

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More Application Notes

Title	Size in Kbytes	Date
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-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 7-Nov-2009]