LM5072 datasheet(1/24 Pages) NSC | Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

1 page

LM5072

Integrated 100V Power Over Ethernet PD Interface and

PWM Controller with Aux Support

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 pro-

vides the flexibility for the PD to also accept power from

auxiliary sources such as AC adapters in a variety of con-

figurations. The low RDS(ON) PD interface hot swap MOS-

FET 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 in-

cludes 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 inher-

ent advantages including line feed-forward, cycle-by-cycle

current limit, and simplified feedback loop compensation.

Two versions of the LM5072 provide either an 80% maxi-

mum duty cycle (-80 suffix), or a 50% maximum duty cycle

(-50 suffix).

Features

PD Interface

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, 0.7

Ω Hot Swap MOSFET

Integrated PD Signature Resistor

Integrated PoE Input UVLO

Programmable Inrush Current Limit

PD Classification Capability

Power Good Indicator

Thermal Shutdown Protection

PWM Controller

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)

Applications

IEEE 802.3af Compliant PoE Powered Devices

Non-Compliant, Application Specific Devices

Higher Power Ethernet Powered Devices

Packages

TSSOP-16 EP (Exposed Pad)

Simplified Application Diagram

20184601

March 2006

DS201846

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