Texas Instruments LM120 Bedienungsanleitung
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LM120,LM320-N
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SNVS756C–APRIL1998–REVISEDAPRIL2013
LM120/LM320-NSeries3-TerminalNegativeRegulators
CheckforSamples:LM120,LM320-N
ExceptionalefforthasbeenmadetomaketheLM120
1
FEATURES
Seriesimmunetooverloadconditions.Theregulators
2
•PresetOutputVoltageErrorLessthan±3%
havecurrentlimitingwhichisindependentof
•PresetCurrentLimit
temperature,combinedwiththermaloverload
protection.Internalcurrentlimitingprotectsagainst
•InternalThermalShutdown
momentaryfaultswhilethermalshutdownprevents
•OperateswithInput-OutputVoltageDifferential
junctiontemperaturesfromexceedingsafelimits
downto1V
duringprolongedoverloads.
•ExcellentRippleRejection
Althoughprimarilyintendedforfixedoutputvoltage
•LowTemperatureDrift
applications,theLM120Seriesmaybeprogrammed
•EasilyAdjustabletoHigherOutputVoltage
forhigheroutputvoltageswithasimpleresistive
divider.Thelowquiescentdraincurrentofthe
devicesallowsthistechniquetobeusedwithgood
DESCRIPTION
regulation.
TheLM120seriesarethree-terminalnegative
regulatorswithafixedoutputvoltageof−5V,−12V,
Table1.LM120SeriesPackagesandPower
and−15V,andupto1.5Aloadcurrentcapability.
Capability
Whereothervoltagesarerequired,theLM137and
DevicePackageRatedPowerDesign
LM137HVseriesprovideanoutputvoltagerangeof
DissipationLoad
−1.2Vto−47V.
Current
TheLM120needonlyoneexternalcomponent—a
LM120/LM320-TO-3(NDS)20W1.5A
compensationcapacitorattheoutput,makingthem
N
easytoapply.Worstcasespecificationsonoutput
TO(NDT)2W0.5A
voltagedeviationduetoanycombinationofline,load
LM320-NTO-220(NDE)15W1.5A
ortemperaturevariationassuresatisfactorysystem
operation.
TypicalApplications
*Requiredifregulatorisseparatedfrom
filtercapacitorbymorethan3inches.For
valuegiven,capacitormustbesolid
tantalum.25μFaluminumelectrolyticmay
besubstituted.
†Requiredforstability.Forvaluegiven,
capacitormustbesolidtantalum.25μF
aluminumelectrolyticmaybesubstituted.
Valuesgivenmaybeincreasedwithout
limit.
Foroutputcapacitanceinexcessof100
μF,ahighcurrentdiodefrominputto
output(1N4001,etc.)willprotectthe
regulatorfrommomentaryinputshorts.
Figure1.DualTrimmedSupply
Figure2.FixedRegulator
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©1998–2013,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Produktspezifikationen
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LM120 |
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