Datasheet > AN296

AN296

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
芯科 - SILICON		光电二极管控制器
页数	文件大小	规格书
24页	443K
描述
USING THE Si3400 AND Si3401 POE PD CONTROLLERS IN ISOLATED AND NON-ISOLATED DESIGNS

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AN296 数据手册

AN296

USING THE Si3400 AND Si3401 POE PD CONTROLLERS

IN ISOLATED AND NON-ISOLATED DESIGNS

1. Introduction

Power over Ethernet (PoE) is an IEEE standard (IEEE 802.3af) for delivering power through Ethernet cables.

802.3af specifies two options for this as shown in Figures 1 and 2.

The option shown in Figure 1 must be used for "midspan equipment", which injects power on the Ethernet

connection of an existing Ethernet link. Endpoint equipment, such as an Ethernet switch, can use either option.

POWER SOURCING

EQUIPMENT (PSE)

POWERED DEVICE

(PD)

SPARE PAIR

SIGNAL PAIR

SPARE PAIR

DC/DC

Converter

48 V

Figure 1. Power Delivered over Spare Pair

POWER SOURCING

EQUIPMENT (PSE)

POWERED DEVICE

(PD)

SPARE PAIR

SIGNAL PAIR

SPARE PAIR

DC/DC

Converter

48 V

Figure 2. Power Delivered over Signal Pair

Rev. 0.8 8/07

AN296

12 3 4 5 6 7...24

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