Datasheet > MCZ34670EG/R2

MCZ34670EG/R2

更新时间： 2024-09-17 02:51:43

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		稳压器开关光电二极管
页数	文件大小	规格书
24页	753K
描述
IEEE 802.3af PD With Current Mode Switching Regulator

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MCZ34670EG/R2 数据手册

Document Number: MC34670

Rev. 3.0, 12/2006

Freescale Semiconductor

Advance Information

IEEE 802.3af PD With Current

Mode Switching Regulator

34670

The 34670 combines a Power Interface Port for IEEE 802.3af

Powered Devices (PD) and a high performance current mode

switching regulator. It allows a designer to build PDs with a minimum

of external components by means of integrating the required IEEE

802.3af functions and all functions necessary to build a high

efficiency DC/DC converter.

POWER OVER ETHERNET

On the PD side the 34670 fully supports the IEEE802.3af standard

and provides complete signature and power classification functions.

It controls inrush current limiting and incorporates adjustable

undervoltage lockout. The switching regulator provides excellent line

and load regulation. It drives an external Power MOSFET with sense

resistor.

EG SUFFIX (PB-FREE)

98ASB42343B

20-PIN SOICW

Features

• Integrated IEEE 802.3af Compliant Interface

• Signature Detection and Classification Functionality

• Integrated Isolation Switch

• Programmable Inrush Current Limiting Control

• Adjustable Undervoltage Lockout

• Input Voltage Range up to 80 V

• Current Mode Control

ORDERING INFORMATION

Temperature

Device

Package

Range (T )

MCZ34670EG/R2

-40°C to 85°C

20 SOICW

• Adjustable Oscillator

• Leading Edge Blanking

• Internal Slope Compensation Circuitry

• Input Overvoltage Protection

• 50% Duty Cycle Limitation

• Pb-Free Packaging Designated by Suffix Code EG

RJ-45

PSE HUB OR SWITCH

ETHERNET APPLIANCE (PD)

PHY

HOST

CONTROLLER

PSE POWER

CONTROLLER

HOST

PROCESSOR

CAT 5

CABLE

SWITCH

-48V

GND

48 V POWER

SUPPLY

34670

PD POWER

CONTROLLER

ISOLATION SWITCH

-48V

DC/DC

Figure 1. 34670 Simplified Application Diagram

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

12 3 4 5 6 7...24

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