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[原创] ST PM8805 IEEE 802.3bt PoE-PD智能以太网供电解决方案

关键词:电源管理 以太网供电 IEEE 802.3bt PoE-PD

时间:2019-05-10 10:59:40       来源:中电网

ST公司的PM8805是封装系统级芯片,用于以太网供电(PoE)供电器件(PD),可用功率水平高达99.9W.器件嵌入两个有源桥及其驱动电路与驱动高边MOSFET,热插拔MOSFET和兼容IEEE 802.3bt的电池泵.PM8805能进行物理层分类,提供有成效的PSE认证身份证明标识,可确认出4对PSE,信息由专用的Tx信号矩阵来提供.器件由以太网电缆的电源或由外接电源如墙上适配器. PM8805集成了100V N沟MOSFET,总通路电阻为0.2Ω,100V 0.1Ω高边热插拔MOSFET,PoE-PD单识别标志接口和IEEE 802.3bt/at/af兼容,支持对PoE应用,支持12V辅助源,智能工作模式,热关断保护,主要用在大功率无线数据系统,安全照相机,接入点,公共信息显示以PoE照明系统.本文介绍了PM8805主要特性,内部框图,应用电路,以及大功率PoE PD/5 V高达20A有源箝位正向评估板STEVAL-POE003V1主要特性别,电路图和材料清单以及PCB设计图与装配图.

The PM8805 is a system-in-package for smartpower supply of Power over Ethernet (PoE)Powered Devices (PD) and it is applicable forpower level up to 99.9 W.

It embeds: two active bridges and their drivingcircuitry, a charge pump to drive the high-sideMOSFETs, the hot swap MOSFET and theinterface compliant with IEEE 802.3bt.

The device performs the physical layerclassification, providing the indication ofsuccessful PSE type identification. A 4-pair PSEis identified and the information is available by adedicated matrix of Tx signals.

The device works with power either from theEthernet cable or from an external power sourcesuch as a wall adapter, with possible prevalenceof the auxiliary source with respect to the..

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