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1、SilabsSi3480以太网供电(PoE)管理解决方案关键词：电源管理,以太网供电,PoESilabs公司的Si3480是电源管理器,和Si3452以太网供电(PoE)控制器一起使用.Si3480采用引脚编程,可用来选择电源容量,低功率(category1,15.4W)数量以及大功率(category2,30W)端口,端口极性以及检测时序,并提供LED驱动以显示端口状态.不需要软件,也不需要数据隔离,完全和IEEE802.3clause33兼容,主要用在802.11nWAPs,IP电话系统和iPBX,工业动化系统和安全与RFID系统等.本文介绍了Si3480主要特性,功能
2、方框图以及典型应用电路图和8端口电源管理参考设计和评估板.TheSi3480isapowermanagerintendedforusewiththeSi3452PoweroverEthernet(PoE)controller.TheSi3480enablestheuseofasmaller,lowercost,andmoreefficiently-utilizedpowersupplyinanunmanagedPoEPowerSourcingEquipment(PSE)system.TheSi3452iscapableofdeliveringover30Wperport,w
3、hichmeansthat,inatypical8-portsystem,a240Wpowersupplywouldhavetobeusedtoavoidoverload.Typically,notallportsareusedatfullpower;so,asmallerpowersupplyintherangeof30to150WcanbeusedalongwiththeSi3480powermanagementcontroller.TheSi3480powermanagementcontrollerispinprogrammed.Thepinsareusedtoset
4、thepowersupplycapacity,thenumberoflowpower(category1,15.4W),andhighpower(category2,30W)ports,theportpriority,andthedetectiontiming(AlternativeAorAlternativeB).TheSi3480usestherealtimeoverloadandcurrentmonitoringcapabilityoftheSi3452tomanagepowerforuptoeightports.Powermanagementisbasedonact
5、ualconsumptionratherthanmereclassificationinordertosupplypowertothegreatestnumberofports.TheSi3480alsoprovidesLEDdrivetoindicateportstatusanddriveanLEDbargraphdisplaytoindicatethepowersupplycapacityinuse.Ifaportisdeniedpowerduetopowersupplycapacitylimitations,theLEDindicatorsprovideasimple
6、andintuitiveindication,helpingauserrecognizeandcorrecttheoverloadsituationbyrebalancingloadsoraddingmid-spanpowerinjectorstoportsthatwouldnototherwisebepowered.Incaseofaportoverload,theportiseasilyre-enabledbydisconnectingthePoweredDevice(PD)andthenreconnectingthePDaftercorrectingtheoverlo
7、adsituation.Si3480主要特性:n Enablesuseofasmallerpowersupplyfora4or8portPoEsystemn Self-containedsolutionoperateswithouttheneedforahostforunmanagedoperationNosoftwarerequiredNodataisolationrequiredFullycompliantwithIEEE802.3clause33forPoweroverEthernetincludingthe
