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TPS23750
TPS23770
SLVS590A–JULY2005–REVISEDAUGUST2005
integrated100-vieee802.3afpdanddc/dccontroller
•
complete802.3afpoeinterface
TheTPS23750integratesthefunctionalityofthe
tps2375withaprimary-sidedc/dcpwmcontroller.
–FeaturesderivedfromtheTPS2375
thedesignercancreateafront-endsolutionfor
–100v,0.6
Ω
InternalPassMOSFET
poe-pdapplicationswithminimumexternal
–StandardandLegacyUVLOChoices
组件.thetps23770isidenticaltothe
–Fixed140mAInrushLimit
TPS23750withtheexceptionoftheundervoltage
lockoutturn-onvoltage,whichiscompatiblewith
•
primarysidedc/dcconvertercontrol
legacysystems.
–MinimumExternalComponentCount
ThePoEfrontendhasallthenecessaryIEEE
–CurrentModeControl
802.3affunctionsincludingdetection,分类,
–isolatedandnon-isolatedtopologies
undervoltagelockoutandinrushcontrol.thepoe
–ProgrammableOperatingFrequency
inputswitchisintegratedwithinthetps23750.
–currentsenseleading-edgeblanking
thedc/dccontrollersectionisdesignedtosupport
反激式,前进,andnonsynchronouslow-sideswitch
–50%DutyCycleLimiting
bucktopologies.
–VoltageOutputErrorAmplifier
TheexternalswitchingMOSFETandcurrentsense
•
InternalPoEandConverterSequencing
resistorprovideflexibilityintopology,powerlevel,和
•
行业-standard20leadpackage
currentlimit.thefull-featureddc/dccontrollerin-
•
工业温度:–40
°
Cto85
°
c
cludesprogrammablesoftstart,hiccuptypefault
限制,50%maximumdutycycle,可编程
constantswitchingfrequency,andatruevolt-
年龄-outputerroramplifier.additionalprotectionfea-
•
allpoepddevicesincluding:
turesprovideforrobustdesigns.
–WirelessAccessPoints
–VoIPPhones
–SecurityCameras
figure1.typicalapplication
pleasebeawarethatanimportantnoticeconcerningavailability,标准保修,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
powerpadisatrademarkoftexasinstruments.
productiondatainformationiscurrentasofpublicationdate.
copyright©2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
必要包括测试所有参数.
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