Texas Instruments LM120 Bedienungsanleitung

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LM120,LM320-N

www.ti.com

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

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TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©1998–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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