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) 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.

Also Recommended LM5068▲ Negative Voltage Hot Swap Controller LM5070▲ Integrated Power Over Ethernet PD Interface And PWM Controller LM5072▲ Higher Transient Voltages (100V), Supplies More Current (750mA) And Compatible With Auxiliary Power MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application *click for larger image	Block Diagram *click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM5071 Power Over Ethernet PD Controller with Auxiliary Power Interface	859 Kbytes	4-Jan-06

Featured Application Notes

Title		Size	Date	Other Language
	AN-1430: Application Note 1430 LM5071 Evaluation Board	738 Kbytes	4-Jan-06
	AN-1474: Application Note 1474 The LM507X Family of PoE Devices: Frequently Asked Questions (FAQs)	457 Kbytes	10-May-06	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge	230 Kbytes	2-Jul-08
	AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07
	AN-1455: Application Note 1455 LM5072 Evaluation Board	708 Kbytes	30-Mar-06	中文
	AN-1358: Application Note 1358 LM5070 'AE' Evaluation Board	787 Kbytes	27-Jan-05
	AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865	1072 Kbytes	10-Jan-06	中文
	AN-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide	14913 Kbytes	4-Apr-08
	AN-1346: Application Note 1346 LM5070 'HE' Evaluation Board	550 Kbytes	13-Mar-06	中文

Design Tools

Title	Size	Date
LM5071 PSPICE model	284 Kbytes	18-Mar-2009
Article - Get The Scoop On How To Power Share Between Isolated PoE Channels

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5071MT-50	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5071MT-80	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5071MTX-50	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5071MTX-80	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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.

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