Datasheet > LM5071

LM5071

更新时间： 2022-12-11 20:25:00

品牌	Logo	应用领域
美国国家半导体 - NSC		光电二极管控制器以太网
页数	文件大小	规格书
18页	855K
描述
Power Over Ethernet PD Controller with Auxiliary Power Power Over Ethernet PD Controller with Auxiliary Power

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LM5071 数据手册

November 2005

LM5071

Power Over Ethernet PD Controller with Auxiliary Power

Interface

n Detection Resistor Disconnect Function

General Description

n Programmable Classification Current

The LM5071 power interface port and pulse width modula-

n Programmable Under-voltage Lockout with

tion (PWM) controller provides a complete integrated solu-

Programmable Hysteresis

tion for Powered Devices (PD) that connect into Power over

Ethernet (PoE) systems. The LM5071 is specifically de-

signed for the PD that must accept power from auxiliary

n Thermal Shutdown Protection

n Auxiliary Power Enable Pin

n Current Mode Pulse Width Modulator

n Supports both Isolated and Non-Isolated Applications

n Error Amplifier and Reference for Non-Isolated

Applications

n Programmable Oscillator Frequency

n Programmable Soft-start

n 80% Maximum Duty Cycle Limiter, Slope Compensation

(-80 device)

n 50% Maximum Duty Cycle Limiter, No Slope

Compensation (-50 device)

sources such as ac adapters. The auxiliary power inter-

face 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 in-

terface and switch mode power supply (SMPS) are inte-

grated into the IC.

Features

Packages

n Compatible with 12V ac adapters

n Fully Compliant 802.3af Power Interface Port

n 80V, 1Ω, 400 mA Internal MOSFET

n TSSOP-16

Block Diagram

20168401

DS201684

www.national.com

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