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T
P
S
2
3
7
5
0
TL
V431
C
TMR
V
偏差
TMR
FREQ
门
COM
RSN
AUX
RSP
FB
竞赛
V
偏差
V
DD
V
偏差
SEN
5
8
V
0.1 F
R
DET
R
类
V
DD
V
SS
类
DET
低 v
oltage
分开的
输出
C
偏差
模式
SENP
BL
RTN
从 spare
pairs 或者
Transformers
从 ethernet
Transformers
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
flyback,向前,andnonsynchronouslow-sideswitch
–50%DutyCycleLimiting
bucktopologies.
–VoltageOutputErrorAmplifier
TheexternalswitchingMOSFETandcurrentsense
•
InternalPoEandConverterSequencing
resistorprovideflexibilityintopology,powerlevel,和
•
工业-standard20leadpackage
currentlimit.thefull-featureddc/dccontrollerin-
•
industrialtemperaturerange:–40
°
Cto85
°
C
cludesprogrammablesoftstart,hiccuptypefault
限制的,50%maximumdutycycle,可编程序的
constantswitchingfrequency,andatruevolt-
age-outputerroramplifier.additionalprotectionfea-
•
allpoepddevicesincluding:
turesprovideforrobustdesigns.
–WirelessAccessPoints
–VoIPPhones
–SecurityCameras
figure1.typicalapplication
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
powerpadisatrademarkoftexasinstruments.
productiondatainformationiscurrentasofpublicationdate.
copyright©2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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