LM317MS资料

LM217MLM317M

MEDIUMCURRENT

1.2TO37VADJUSTABLEVOLTAGEREGULATOR

sssssss

s

OUTPUTVOLTAGERANGE:1.2TO37VOUTPUTCURRENTINEXCESSOF500mALINEREGULATIONTYP.0.01%LOADREGULATIONTYP.0.1%

THERMALOVERLOADPROTECTIONSHORTCIRCUITPROTECTIONOUTPUTTRANSISTORSAFEAREACOMPENSATION

FLOATINGOPERATIONFORHIGHVOLTAGEAPPLICATIONS

TO-220

DESCRIPTION

TheLM217M/LM317MaremonolithicintegratedcircuitsinTO-220,DPAK,SOT-82andSOT-194packagesintendedforuseaspositiveadjustablevoltageregulators.

Theyaredesignedtosupplyuntil500mAofloadcurrentwithanoutputvoltageadjustableovera1.2to37Vrange.

Thenominaloutputvoltageisselectedbymeansofonlyaresistivedivider,makingthedeviceexceptionallyeasytouseandeliminatingthestockingofmanyfixedregulators.SCHEMATICDIAGRAM

DPAKTO-252

SOT-82SOT-194

September19971/11

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LM217M/LM317M

ABSOLUTEMAXIMUMRATINGS

SymbolVi-VoPdToprTstg

PowerDissipation

OperatingJunctionTemperatureRange(*)StorageTemperatureRange

o

Parameter

Input-OutputDifferentialVoltage

forLM217MforLM317M

Value40

InternallyLimited

-40to1250to125-55to150

UnitV

ooo

CCC

(*)Re-BootisnotguaranteedforTj≥85C

THERMALDATA

Symbol

Parameter

SOT-82SOT-194DPAK

MaxMax

8100

TO-220

Unit

Rthj-caseThermalResistanceJunction-caseRthj-ambThermalResistanceJunction-ambient350

oo

C/WC/W

PINCONNECTIONANDORDERINGNUMBERS

TO-220

SOT-82

DPAKSOT-194

TypeLM217MLM317M

TO-220LM217MTLM317MT

DPAKLM217MDTLM317MDT

SOT-82LM217MXLM317MX

SOT-194LM217MSLM317MS

TESTCIRCUIT

2/11

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LM217M/LM317M

ELECTRICALCHARACTERISTICSFORLM217M(Refertothetestcircuits,-40≤Tj≤125oCVi-Vo=5V,Io=100mA,Pd≤7.5W,unlessotherwisespecified)

Symbol∆Vo∆Vo

Parameter

LineRegulationLoadRegulation

TestConditions

Vi-Vo=3to40VVo≤5V

Io=10mAto500mAVo≥5V

Io=10mAto500mA

IADJ∆IADJVREF∆VoVoIo(min)Io(max)eNSVR

AdjustmentPinCurrentAdjustmentPinCurrentReferenceVoltage

OutputVoltageTemperatureStability

MinimumLoadCurrentMaximumOutputCurrentOutputNoiseVoltage(percentanceofVO)

SupplyVoltageRejection(*)

Vi-Vo=40V

Vi-Vo≤15V

Vi-Vo=40V,Pdo

Tj=25C

o

Tj=25Cf=120Hz

500

Vi-Vo=3to40VIo=10mAto500mAVi-Vo=3to40VIo=10mAto500mA

Tj=25CTj=25CTj=25oC

oo

Min.Typ.0.010.025200.10.3500.2

Max.0.020.0515500.3110051.3

Unit%/V%/VmVmV%/Vo%/VoµAµAV%

1.21.250.73.510002000.003

5mAmA%dBdB

CADJ=0CADJ=10µF

66

6580

(*)CADJisconnectedbetweenAdjustpinandGround.

ELECTRICALCHARACTERISTICSFORLM317M(Refertothetestcircuits,0≤Tj≤125oCVi-Vo=5V,Io=100mA,Pd≤7.5W,unlessotherwisespecified)

Symbol∆Vo∆Vo

Parameter

LineRegulationLoadRegulation

TestConditions

Vi-Vo=3to40VVo≤5V

Io=10mAto500mAVo≥5V

Io=10mAto500mA

IADJ∆IADJVREF∆VoVoIo(min)Io(max)eNSVR

AdjustmentPinCurrentAdjustmentPinCurrentReferenceVoltage

OutputVoltageTemperatureStability

MinimumLoadCurrentMaximumOutputCurrentOutputNoiseVoltage(percentanceofVO)

SupplyVoltageRejection(*)

Vi-Vo=40V

Vi-Vo≤15V

o

Vi-Vo=40V,Pdo

Tj=25CTj=25oCf=120Hz

500

Vi-Vo=3to40VIo=10mAto500mAVi-Vo=3to40VIo=10mAto500mA

Tj=25CTj=25CTj=25C

ooo

Min.Typ.0.010.025200.10.3500.2

Max.0.040.0725700.51.510051.3

Unit%/V%/VmVmV%/Vo%/VoµAµAV%

1.21.250.73.510002000.003

10mAmA%dBdB

CADJ=0CADJ=10µF

66

6580

(*)CADJisconnectedbetweenAdjustpinandGround.

3/11

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LM217M/LM317M

Figure1:CurrentLimit

Figure2:MinimumOperatingCurrent

Figure3:BasicAdjustableRegulator.

LM317M

Figure4:ThermalResistance&MaximumPowerDissipationvsP.C.B.CopperLenghtforDPAK

PdmaxcalculatedforTa=50oC

4/11

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LM217M/LM317M

APPLICATIONINFORMATION

TheLM317Mprovidesaninternalreferencevoltageof1.25Vbetweentheoutputandadjustmentsterminals.Thisisusedtosetaconstantcurrentflowacrossanexternalresistordivider(seefig.3),givinganoutputvoltageVOof:

R2

VO=VREF(1+)+IADJR2

R1

ThedevicewasdesignedtominimizethetermIADJ(100µAmax)andtomaintainitveryconstantwithlineandloadchanges.Usually,theerrortermIADJ⋅R2canbeneglected.Toobtainthepreviousrequirement,alltheregulatorquiescentcurrentisreturnedtotheoutputterminal,imposingaminimumloadcurrentcondition.Iftheloadisinsufficient,theoutputvoltagewillrise.SincetheLM317Misafloatingregulatorand”sees”onlytheinput-to-outputdifferentialvoltage,suppliesofveryhighvoltagewithrespecttogroundcanberegulatedaslongasthemaximuminput-to-outputdifferentialisnotexceeded.Furthermore,programmableregulatorareeasilyobtainableand,byconnectingafixedresistorbetweentheadjustmentandoutput,thedevicecanbeusedasaprecisioncurrentregulator.

Inordertooptimisetheloadregulation,thecurrentsetresistorR1(seefig.3)shouldbetiedascloseaspossibletotheregulator,whilethegroundterminalofR2shouldbenearthegroundoftheloadtoprovideremotegroundsensing.EXTERNALCAPACITORS(Fig.5)

Normallynocapacitorsareneededunlessthedeviceissituatedfarfromtheinputfiltercapacitors;inwhichcaseaninputbypassisneeded.

A0.1µFdiscor1µFtantaliuminputbypasscapacitor(CI)isrecommendedtoreducethesensitivitytoinputlineimpedance.

Theadjustmentterminalmaybebypassedtogroundtoimproveripplerejection.Thiscapacitor(Cadj)preventsripplefrombeingamplifiedastheoutputvoltageisincreased.A10µFcapacitorshouldimproveripplerejectionabout80dBat120Hzana10Vapplication.

AlthoughtheLM317Misstablewithnooutputcapacitancelikeanyfeedbackcircuit,certainvaluesofexternalcapacitancecancauseexcessiveringing.Anoutputcapacitance(CO)intheformofa1µFtantaliumor25µFaluminiumelectrolyticcapacitorontheoutputswampsthiseffectandinsuresstability.

PROTECTIONDIODES(Fig.5)

WhenexternalcapacitorsareusedwithanyICregulatoritissometimesnecessarytoaddprotectiondiodestopreventthecapacitorsfromdischargingthroughlowcurrentpointsintotheregulator.

Figure5showtheLM317Mwiththerecommendedprotectiondiodesforoutputvoltagesinexcessof25Vorhighcapacitancevalues(C3>25µF,C2>10µF).DiodeD1preventsC3fromdischargingthroughtheICduringaninputshort-circuit.ThecombinationofdiodesD1andD2preventsC2fromdiscargingthroughtheregulatorduringaninputoroutputshort-circuit.

START-UPBLOCK

It’snotguaranteedtheRe-Bootofthedevicewhenthejunctiontemperatureisover85oC.

5/11

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LM217M/LM317M

Figure5:VoltageRegulatorwithProtectionDiodes.

LM317M

Figure6:SlowTurn-on15VRegulator.Figure7:CurrentRegulator.

LM317M

LM317M

Io=

Vref1.25V+IADJ≈R1R1

Figure8:5VElectronicShut-downRegulator.Figure9:DigitallySelectedOutputs.

LM317M

LM317M

(R2setsmaximumVo)

6/11

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LM217M/LM317M

TO-220MECHANICALDATA

DIM.

MIN.

ACDD1EFF2GH2H3L2L3L5L6L7Dia.

26.32.615.163.6510.05

16.226.7

27.1315.86.63.85

1.0350.1020.5940.2360.144

2.41.20.350.611.154.95

5.08mmTYP.

MAX.4.81.372.81.350.550.941.45.2110.410.4

0.396

0.6381.051

1.0670.1180.6220.2600.152

0.0940.0470.0140.0240.0450.195

0.200

MIN.

inchTYP.

MAX.0.1890.0540.1100.0530.0220.0370.0550.2050.4090.409

P011D

7/11

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LM217M/LM317M

TO-252(DPAK)MECHANICALDATA

DIM.

MIN.

AA1A2BB2CC2DEGHL2L4

0.62.20.90.030.645.20.450.4866.44.49.35

0.8

1

0.023

mmTYP.

MAX.2.41.10.230.95.40.60.66.26.64.610.1

MIN.0.0860.0350.0010.0250.2040.0170.0190.2360.2520.1730.368

0.031

0.039

inchTYP.

MAX.0.0940.0430.0090.0350.2120.0230.0230.2440.2600.1810.397

H

AC2CDETAIL”A”

A1L2D

DETAIL”A”

B==3B2==L4

1=GE2=A20068772-B

8/11

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LM217M/LM317M

SOT-82MECHANICALDATA

mm

MIN.

ABbb1Cc1Dee3FH

7.410.50.70.492.4

1.215.72.24.43.8

2.54

TYP.

MAX.7.811.30.90.752.7

MIN.0.2910.4130.0280.0190.04

0.0470.6180.0870.1730.1500.100inchTYP.

MAX.0.3070.4450.0350.0300.106

DIM.

CA

FHc1

b

b1

e3e

DBP032A

9/11

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LM217M/LM317M

SOT-194MECHANICALDATA

DIM.

MIN.

ABbb1Cc1c2Dee3FHPSS1T

420.1

7.410.50.70.492.4

1.21.362.24.43.8

2.54

45(typ.)

0.1570.0790.004

mmTYP.

MAX.7.811.30.90.752.7

MIN.0.2910.4130.0280.0190.094

0.0470.0510.2360.0870.1730.150

0.100

inchTYP.

MAX.0.3070.4450.0350.0300.106

C

A

FC1

ST

P

He

e3

P032B

S1b1

b

c2

10/11

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LM217M/LM317M

Informationfurnishedisbelievedtobeaccurateandreliable.However,SGS-THOMSONMicroelectronicsassumesnoresponsabilityfortheconsequencesofuseofsuchinformationnorforanyinfringementofpatentsorotherrightsofthirdpartieswhichmayresultsfromitsuse.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofSGS-THOMSONMicroelectronics.Specificationsmentionedinthispublicationaresubjecttochangewithoutnotice.Thispublicationsupersedesandreplacesallinformationpreviouslysupplied.

SGS-THOMSONMicroelectronicsproductsarenotauthorizedforuseascriticalcomponentsinlifesupportdevicesorsystemswithoutexpresswrittenapprovalofSGS-THOMSONMicroelectonics.

©1997SGS-THOMSONMicroelectronics-PrintedinItaly-AllRightsReserved

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.

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