Texas Instruments LM317A Handleiding
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LM317A
SNVSAC2A–MARCH2015–REVISEDJUNE2020
LM317A1%Accurate1.5AAdjustableVoltageRegulator
1
1Features
1
•Foranewerdrop-inalternative,seetheLM317
•Typical0.005%/Vlineregulation
•1%outputvoltagetolerance
•1.5-Aoutputcurrent
•Adjustableoutputdownto1.25V
•Input-outputdifferentialupto40V
•Currentlimitconstantwithtemperature
•Nooutputcapacitorrequired
•Short-circuitprotectedoutput
•−40°Cto125°Coperatingtemperaturerange
2Applications
•AutomotiveLEDlighting
•Batterychargers
•Postregulationforswitchingsupplies
•Constant-currentregulator
•Microprocessorsupplies
TypicalApplication
*Neededifdeviceismorethan6inchesfromfilter
capacitors.
†Optional—improvestransientresponse
††
3Description
TheLM317Aadjustable3-terminal,positive-voltage
regulatorsarecapableofsupplyingcurrentinexcess
of1.5Aovera1.25-Vto37-Voutputrangeand
provide1%output-voltageaccuracy.Bothline
regulationandloadregulationarebetterachieved
withtheLM317Adevicethanwithstandardfixed
regulators.
TheLM317Aoffersfulloverloadprotectionsuchas
overcurrent,thermal-overloadprotection,andsafe-
areaprotection.Alloverloadprotectioncircuitry
remainsfullyfunctionaleveniftheadjustment
terminalisdisconnected.
Typically,nocapacitorsareneededunlessthedevice
issituatedmorethan6inchesfromtheinputfilter
capacitors,inwhichcaseaninputbypassisneeded.
Anoptionaloutputcapacitorcanbeaddedtoimprove
transientresponseandcanbereplacedwitha
ceramicandappropriateESR.Theadjustment
terminalcanbebypassedtoachieveveryhighripple-
rejectionratiosthataredifficulttoachievewith
standard3-terminalregulators.
BecausetheLM317Aregulatorisfloatinganddetects
onlytheinput-to-outputdifferentialvoltage,supplies
ofseveralhundredvoltscanberegulatedaslongas
themaximuminput-to-outputdifferentialisnot
exceeded.Exceedingthemaximuminput-to-output
deferentialwillresultinshort-circuitingtheoutput.By
connectingafixedresistorbetweentheadjustment
pinandoutput,theLM317Acanbealsousedasa
precisioncurrentregulator.
Forapplicationsrequiringgreateroutputcurrent,see
theLM150series(3A)andLM138series(5A)data
sheets.Forthenegativecomplement,seetheLM137
seriesdatasheet.
DeviceInformation
(1)
PART
NUMBER
PACKAGEBODYSIZE(NOM)
LM317A
TO-220(3)14.986mm×10.16mm
SOT-223(4)6.50mm×3.50mm
TO(3)8.255mm×8.255mm
TO-252(3)6.58mm×6.10mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM317A |
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