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资料编号:1049707
 
资料名称:TPS73025DBVRG4
 
文件大小: 385K
   
说明
 
介绍:
LOW-NOISE, HIGH PSRR, RF 200-mA LOW-DROPOUT LINEAR REGULATORS
 
 


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本平台电子爱好着纯手工中文简译:截至2020/5/17日,支持英文词汇500个
www.德州仪器.com
APPLICATIONINFORMATION
V
V
输出
GNDEN NR
输出
V
V
输出
0.1
µ
F
0.01
µ
F
2.2
µ
F
TPS730xx
ExternalCapacitorRequirements
BoardLayoutRecommendationtoImprovePSRRandNoisePerformance
tps73001,tps73018
TPS73025
tps73030,tps73033
SBVS054A–NOVEMBER2004–REVISEDNOVEMBER2004
thetps730xxfamilyoflow-落后(ldo)regulatorshasbeenoptimizedforuseinnoise-敏感的
电池-operatedequipment.thedevicefeaturesextremelylowdropoutvoltages,highpsrr,ultralowoutput
噪音,lowquiescentcurrent(170µatypically),andenable-inputtoreducesupplycurrentstolessthan1µa
whentheregulatoristurnedoff.
atypicalapplicationcircuitisshowninfigure16.
figure16.typicalapplicationcircuit
a0.1-µforlargerceramicinputbypasscapacitor,connectedbetweeninandgndandlocatedclosetothe
tps730xx,isrequiredforstabilityandimprovestransientresponse,noiserejection,andripplerejection.一个
高等级的-valueinputcapacitormaybenecessaryiflarge,快-上升-timeloadtransientsareanticipatedorthedevice
islocatedseveralinchesfromthepowersource.
likemostlowdropoutregulators,thetps730xxrequiresanoutputcapacitorconnectedbetweenoutandgnd
tostabilizetheinternalcontrolloop.theminimumrecommendedcapacitanceis2.2µf.any2.2-µforlarger
ceramiccapacitorissuitable,providedthecapacitancedoesnotvarysignificantlyovertemperature.ifload
currentisnotexpectedtoexceed100ma,a1.0-µfceramiccapacitorcanbeused.
theinternalvoltagereferenceisakeysourceofnoiseinanldoregulator.thetps730xxhasannrpinwhich
isconnectedtothevoltagereferencethrougha250-k
internalresistor.the250-k
internalresistor,在
conjunctionwithanexternalbypasscapacitorconnectedtothenrpin,createsalowpassfiltertoreducethe
voltagereferencenoiseand,因此,thenoiseattheregulatoroutput.inorderfortheregulatortooperate
合适的,thecurrentflowoutofthenrpinmustbeataminimum,becauseanyleakagecurrentcreatesanir
dropacrosstheinternalresistorthuscreatinganoutputerror.因此,thebypasscapacitormusthave
minimalleakagecurrent.thebypasscapacitorshouldbenomorethan0.1-µftoensurethatitisfullycharged
duringthequickstarttimeprovidedbytheinternalswitchshownintheFunctionalBlockDiagrams
asanexample,thetps73018exhibitsonly23µv
RMS
ofoutputvoltagenoiseusinga0.01-µfceramicbypass
capacitoranda2.2-µfceramicoutputcapacitor.notethattheoutputstartsupslowerasthebypasscapacitance
increasesduetotherctimeconstantatthenrpinthatiscreatedbytheinternal250-k
resistorandexternal
电容.
toimproveacmeasurementslikepsrr,outputnoise,andtransientresponse,itisrecommendedthattheboard
bedesignedwithseparategroundplanesforV
andV
输出
,witheachgroundplaneconnectedonlyatthegnd
pinofthedevice.inaddition,thegroundconnectionforthebypasscapacitorshouldconnectdirectlytothegnd
pinofthedevice.
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