PBL3717A

........

STEPPERMOTORDRIVER

FULLSTEP-HALFSTEP-QUARTERSTEPOPERATINGMODE

BIPOLAROUTPUTCURRENTUPTO1A

FROM10VUPTO46VMOTORSUPPLYVOLTAGE

LOWSATURATIONVOLTAGEWITHINTE-GRATEDBOOTSTRAP

BUILTINFASTPROTECTIONDIODESEXTERNALLYSELECTABLECURRENTLEVEL

OUTPUTCURRENTLEVELDIGITALLYORANALOGUECONTROLLED

THERMALPROTECTIONWITHSOFTINTER-VENTION

Powerdip12+2+2(PlasticPackage)ORDERCODE:PBL3717A

DESCRIPTION

ThePBL3717AisamonolithicICwhichcontrolsanddrivesonephaseofabipolarsteppermotorwithchoppercontrolofthephasecurrent.Currentlevelsmaybeselectedinthreestepsbymeansoftwologicinputswhichselectoneofthreecurrentcompara-tors.Whenbothoftheseinputsarehighthedeviceisdisabled.Aseparatelogicinputcontrolsthedirec-tionofcurrentflow.

Amonostable,programmedbyanexternalRCnet-work,setsthecurrentdecaytime.

ThepowersectionisafullH-bridgedriverwithfourinternalclampdiodesforcurrentrecirculation.Anexternalconnectiontotheloweremittersisavailablefortheinsertionofasensingresistor.TwoPBL3717Asandfewexternalcomponentsformacompletesteppermotordrivesubsystem.

Theraccomendedoperatingambienttemperaturerangesisfrom0to70°C.

ThePBL3717Aissuppliedina12+2+2leadPow-erdippackage.

April1993

PINCONNECTION(topview)

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PBL3717A

PINFUNCTIONS

N°1234567

NameUTPUTBPULSETIMESUPPLYVOLTAGEB

GROUNDGROUNDLOGICSUPPLY

INPUT1

Function

OutputConnection(withpin15).Theoutputstageisa”H”bridgeformedbyfourtransistorsandfourdiodessuitableforswitchingapplications.

AparallelRCnetworkconnectedtothispinsetstheOFFtimeofthelowerpowertransistors.Thepulsegeneratorisamonostabletriggeredbytherisingedgeoftheoutputofthecomparators(toff=0.69RTCT).SupplyVoltageInputforHalfOutputStageSeealsopin14.

GroundConnection.Withpins5,12and13alsoconductsheatfromdietoprintedcircuitcopper.Seepin4.

SupplyVoltageInputforLogicCircuitry

Thispinandpin9(INPUT0)arelogicinputswhichselecttheoutputsofthethreecomparatorstosetthecurrentlevel.Currentalsodependsonthesensingresistorandreferencevoltage.Seetruthtable.

ThisTTL-compatiblelogicinputsetsthedirectionofcurrentflowthroughtheload.AhighlevelcausescurrenttoflowfromOUTPUTA(source)toOUTPUTB(sink).Aschmitttriggeronthisinputprovidesgoodnoiseimmunityandadelaycircuitpreventsoutputstageshortcircuitsduringswitching.SeeINPUT1(pin7).

Inputconnectedtothethreecomparators.ThevoltageacrossthesenseresistorisfeedbacktothisinputthroughthelowpassfilterRCCC.Thelowerpower

transistoraredisabledwhenthesensevoltageexceedsthereferencevoltageoftheselectedcomparator.WhenthisoccursthecurrentdecaysforatimesetbyRTCT,toff=0.69RTCT.

Avoltageappliedtothispinsetsthereferencevoltageofthethreecomparators,thisdeterminingtheoutputcurrent(alsothusdependingonRsandthetwoinputsINPUT0andINPUT1).Seepin4.Seepin4.

SupplyVoltageInputforHalfOutputStage.Seealsopin13.Seepin1.

ConnectiontoLowerEmittersofOutputStageforInsertionofCurrentSenseResistor

8PHASE

910

INPUT0COMPARATOR

INPUT

111213141516

REFERENCEGROUNDGROUNDSUPPLYVOLTAGEA

OUTPUTASENSERESISTOR

TRUTHTABLE

Input0(pin9)

HLHL

Input1(pin7)

HHLL

NoCurrentLowCurrentMediumCurrentHighCurrent

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PBL3717A

BLOCKDIAGRAM

ABSOLUTEMAXIMUMRATINGS

SymbolVsVssViVcVrIoTstgTj

PowerSupplyVoltageLogicSupplyVoltageLogicInputVoltageComparatorInputReferenceInputVoltageOutputCurrent(DCoperation)StorageTemperature

OperatingJunctionTemperature

Parameter

Value5076Vss151.2–55to+150

150

VA°C°CUnitVVV

THERMALDATA

SymbolRthj-caseRthj-amb

Parameter

ThermalResistanceJunction-pinsThermalResistanceJunction-ambient*

Value1140

Unit°C/W°C/W

*Solderedona35µthick20cm2P.C.boardcopperarea.

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PBL3717A

ELECTRICALCHARACTERISTICS

(refertothetestcircuitVS=36V,VSS=5V,Tamb=25oCunlessotherwisespecified)

SymbolVsVssIssIRViLViHIiLIiHVCLVCMVCHICtofftdIoffVsat

Parameter

SupplyVoltage(pin3,14)LogicSupplyVoltage(pin6)LogicSupplyCurrent(pin6)ReferenceInputCurrent(pin11)InputLowVoltage(pins7,8,9)InputHighVoltage(pin7,8,9)LowVoltageInputCurrent(pins7,8,9)HighVoltageInputCurrent(pins7,8,9)ComparatorLowThresholdVoltage(pin10)ComparatorMediumThresholdVoltage(pin10)ComparatorHighThresholdVoltage(pin10)ComparatorInputCurrent(pin10)CutoffTimeTurnOffDelay

OutputLeakageCurrent(pins1,15)SaturationVoltage(pins1,15)

RT=56kΩCT=820pF(seefig.2)Io=H

I1=H

25

Vi=0.4VVi=2.4VVR=5VVR=5VVR=5V

Io=LI1=HIo=LI1=HIo=LI1=H

66236396

78251416

pin8pins7,9

2

VR=5V

TestConditions

Min.104.75

70.75Typ.

Max.465.251510.8Vss–100–4001090266436±20352100

UnitVVmAmAVVµAµAµAmVmVmVµAµsµsµAV

LOGICINPUTS

COMPARATORS

SOURCEDIODE-TRANSISTORPAIR

IM=–0.5A(seefig.2)ConductionPeriodRecirculationPeriodIM=–1A(seefig.2)ConductionPeriodRecirculationPeriodVs=46VIM=–0.5AIM=–1AIM=–0.5AIM=–1AIM=0.5AIM=1AVs=46VIM=0.5AIM=1A

1.11.41.11.611.31.71.12.11.7

2.11.352.82.53001.251.7251.352.33001.52

VsatSaturationVoltage(pins1,15)V

ILKVFISLK

LeakageCurrentDiodeForwardVoltage

SubstrateLeakageCurrentwhenClamped

µAVVmAmAVVµAVV

SINKDIODE-TRANSISTORPAIR

VsatILKVF

SaturationVoltage(pins1,15)LeakageCurrentDiodeForwardVoltage

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PBL3717A

Figure1:TestandApplicationCircuit

Figure2:WaveformswithMARegulating(phase=0)

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PBL3717A

Figure3:TwoPhaseBipolarStepperMotorDriver

Figure4:P.C.BoardandComponentLayoutoftheCircuitoffig.3(1:1scale)

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PBL3717A

Figure5:InputandOutputSequencesforHalfStepandFullStepOperation

APPLICATIONINFORMATIONS

Figure3showsatypicalapplicationinwhichtwoPBL3717Acontrolatwophasebipolarsteppermo-tor.

Programming

ThelogicinputsI0andI1setatthreedifferentlevelstheamplitudeofthecurrentflowinginthemotorwindingaccordingtothetruthtableofpage2.Ahighlevelonthe”PHASE”logicinputsetsthedirectionofthatcurrentfromoutputAtooutputB;alowlevelfromoutputBtooutputA.

Itisrecommendedthatunusedinputsaretiedtopin6(Vss)orpin4(GND)asappropriatetoavoidnoiseproblem.

Thecurrentlevelscanbevariedcontinuouslybychangingtheref.voltageonpin11.

ControloftheMotor

Thesteppermotorcanrotateineitherdirectionsac-cordingtothesequenceoftheinputsignals.Itispossibletoobtainafullstep,ahalfstepandaquar-terstepoperation.

FullStepOperation

Boththewindingsofthesteppermotorareener-gizedallthetimewiththesamecurrentIMA=IMB.I0andI1remainfixedatwhatevertorquevalueisre-quired.

CallingAtheconditionwithwindingAenergizedinonedirectionandAintheotherdirection,these-quenceforfullsteprotationis:

AB→AB→AB→ABetc.

Fortherotationintheotherdirectionthesequencemustbereserved.

Inthefullstepoperationthetorqueisconstanteachstep.

HalfStepOperation

Powerisappliedalternatelytoonewindingthenbothaccordingtothesequence:

AB→B→AB→A→AB→B→AB→Aetc.Likefullstepthiscanbedoneatanycurrentlevel;thetorqueisnotconstantbutitislowerwhenonlyonewindingisenergized.

AcoilisturnedoffbysettingI0andI1bothhigh.

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PBL3717A

QuarterStepOperation

Itispreferabletorealizethequarterstepoperationatfullpowerotherwisethestepswillbeofveryir-regularsize.

Theextraquarterstepsareaddedtothehalfstepssequencebyputtingonecoilonhalfcurrentaccord-ingtothesequence.

__

AAB

AB→ B→B→B→AB→A→Aetc.

222MotorSelection

AsthePBL3717Aprovidesconstantcurrentdrive,withaswitchingoperation,caremustbetakentose-lectsteppermotorswithlowhysteresislossestopreventmotoroverheat.Figure6:

SourceSaturationVoltageversusOutputCurrent(recircuitperiod)

Figure7:

L-CFilter

ToreduceEMIandchoppinglossesinthemotoralowpassL-Cfiltercanbeinsertedacrosstheout-putsofthePBL3717Aasshownonthefollowingpic-ture.

L≈

1

LM10

C≈

4⋅10−10

L

SourceSaturationVoltageversusOutputCurrent(conductionperiod)

Figure8:

SinkSaturationVoltageversusOutputCurrent

Figure9:

ComparatorThresholdversusJunctionTemperature

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PBL3717A

MOUNTINGINSTRUCTIONS

TheRthj-ambofthePBL3717AcanbereducedbysolderingtheGNDpinstoasuitablecopperareaoftheprintedcircuitboardortoanexternalheatsink.Figure10:ExampleofP.C.BoardCopperArea

whichisusedasHeatsink

Thediagramoffig.11showsthemaximumdissipa-blepowerPtotandtheRthj-ambasafunctionoftheside”α”oftwoequalsquarecopperareashavingathichknessof35µ(seefig.10).

Figure11:Max.DissipablePowerandJunction-AmbientThermalResistanceversussize”a”

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PBL3717A

POWERDIP16PACKAGEMECHANICALDATA

DIM.

MIN.

a1Bbb1DEee3FILZ

3.30

1.27

8.802.5417.78

7.105.10

0.130

0.050

0.380.510.85

0.50

0.5020.0

0.3460.1000.700

0.2800.201

0.015

1.40

mmTYP.

MAX.

MIN.0.0200.033

0.020

0.0200.7870.055

inchTYP.

MAX.

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PBL3717A

Informationfurnishedisbelievedtobeaccurateandreliable.However,SGS-THOMSONMicroelectronicsassumesnoresponsibilityfortheconsequencesofuseofsuchinformationnorforanyinfringementofpatentsorotherrightsofthirdpartieswhichmayresultfromitsuse.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofSGS-THOMSONMicroelectronics.Specifica-tionsmentionedinthispublicationaresubjecttochangewithoutnotice.Thispublicationsupersedesandreplacesallinformationpre-viouslysupplied.SGS-THOMSONMicroelectronicsproductsarenotauthorizedforuseascriticalcomponentsinlifesupportdevicesorsystemswithoutexpresswrittenapprovalofSGS-THOMSONMicroelectronics.

©1994SGS-THOMSONMicroelectronics-AllRightsReserved

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