1FEATURES
DESCRIPTION
UC2625-EP
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..................................................................................................................................................................................................SLUS802–MARCH2008
BRUSHLESSDCMOTORCONTROLLER
•ControlledBaseline•DrivesPowerMOSFETsorPowerDarlingtons
Directly
–OneAssemblySite
•50-VOpenCollectorHigh-SideDrivers
–OneTestSite
•LatchedSoftStart
–OneFabricationSite
•High-speedCurrent-SenseAmplifierwithIdeal
•ExtendedTemperaturePerformanceof–55°C
Diode
to125°C
•Pulse-by-PulseandAverageCurrentSensing
•EnhancedDiminishingManufacturingSources
(DMS)Support•Over-VoltageandUnder-VoltageProtection
•EnhancedProduct-ChangeNotification•DirectionLatchforSafeDirectionReversal
•QualificationPedigree(1)•Tachometer
(1)ComponentqualificationinaccordancewithJEDECand•TrimmedReferenceSources30mA
industrystandardstoensurereliableoperationoveran•ProgrammableCross-ConductionProtection
extendedtemperaturerange.Thisincludes,butisnotlimited
to,HighlyAcceleratedStressTest(HAST)orbiased85/85,•Two-QuadrantandFour-QuadrantOperation
temperaturecycle,autoclaveorunbiasedHAST,
electromigration,bondintermetalliclife,andmoldcompound
life.Suchqualificationtestingshouldnotbeviewedas
justifyinguseofthiscomponentbeyondspecified
performanceandenvironmentallimits.
TheUC2625motorcontrollerintegratesmostofthefunctionsrequiredforhigh-performancebrushlessdcmotor
controlintoonepackage.WhencoupledwithexternalpowerMOSFETsorDarlingtons,thisdeviceperforms
fixed-frequencyPWMmotorcontrolineithervoltageorcurrentmodewhileimplementingclosedloopspeed
controlandbrakingwithsmartnoiserejection,safedirectionreversal,andcross-conductionprotection.
Althoughspecifiedforoperationfrompowersuppliesbetween10Vand18V,theUC2625cancontrolhigher
voltagepowerdeviceswithexternallevel-shiftingcomponents.TheUC2625containsfast,high-currentpush-pull
driversforlow-sidepowerdevicesand50-Vopen-collectoroutputsforhigh-sidepowerdevicesorlevelshifting
circuitry.
TheUC2625ischaracterizedforoperationoverthemilitarytemperaturerangeof–55°Cto125°C.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2008,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Copyright©2008,TexasInstrumentsIncorporated
TypicalApplication
21
27
25
22
6
28
1
15
24326
10 kW
3 kW10 kW
2 19
20
16
11
20 mF
100 nF
20 mF
100 nF +
ROSC
33 kW
2200 pF
COSC
68 kW
RT
3 nF
CT
BRAKE
5 nF
100 nF
23 8 9 10 4 5 7
2 nF
2 nF
2 nF
100 nF
10 kW
5 nF 240 W
240 W
17
18
14
13
12
3 kW
2N3906
100 nF
1 k
4 kW
TO OTHER
CHANNELS
TO OTHER
CHANNELS
10 W
2N3904
10 W
IRF9350
IRF532
3 kW
FROM HALL
SENSORS
VMOTOR+15 V
+5 V TO HALL
SENSORS
VREF
0.02 W
RS
TO
MOTOR
0.02 W
RD
REQUIRED
FOR
AVERAGE
CURRENT
SENSING
REQUIRED
FOR BRAKE
AND FAST
REVERSE
100 mF
+
UC3625
DIR
QUAD
51 kW
VREF
ABSOLUTEMAXIMUMRATINGS(1)
UC2625-EP
SLUS802–MARCH2008..................................................................................................................................................................................................
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overoperatingfree-airtemperaturerange(unlessotherwisenoted)
VALUEUNIT
VCC20
Supplyvoltage
PWRVCC20
PWMIN–0.3to6
E/AIN(+),E/AIN(–)–0.3to12V
ISENSE1,ISENSE2–1.3to6
OV-COAST,DIR,SPEED-IN,SSTART,QUADSEL–0.3to8
H1,H2,H3–0.3to12
PUOutputVoltage–0.3to50
PU+200continuous
PD±200continuous
E/A±10
OutputcurrentmA
ISENSE–10
TACHOUT±10
VREF–50continuous
TJOperatingtemperaturerange–55to125°C
(1)Currentsarepositiveintoandnegativeoutofthespecifiedterminal.
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PWR VCC
RC-OSC
PWM IN
E/A OUT
VCC
SSTART
OV-COAST
QUAD SEL
E/A IN(-)
ISENSE
VREF
H3
SPEED-IN
H2
ISENSE1
ISENSE2
DIR
E/A IN(+)
H1
PDC PUB
RC-BRAKE
TACH-OUT
PUA
PDB
PDA GND
PUC
14
13
12
11
10
9
8
7
6
5
4
3
2
1
15
16
17
18
19
20
21
22
23
24
25
26
27
28
UC2625-EP
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CONNECTIONDIAGRAM
A.ThispinoutappliestotheSOIC(DW)package.
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ELECTRICALCHARACTERISTICS
UC2625-EP
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Unlessotherwisestated,thesespecificationsapplyfor:TA=25°C;PwrVCC=VCC=12V;ROSC=20kΩtoVREF;COSC=2nF;
RTACH=33kΩ;CTACH=10nF;andalloutputsunloaded.TA=TJ.
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
Overall
Supplycurrent14.530.0mA
VCCturn-onthreshold-55°Cto125°C8.658.959.55V
VCCturn-offthreshold7.758.058.55
Overvoltage/Coast
OV-COASTinhibitthreshold1.651.751.85
OV-COASTrestartthreshold1.5351.651.75V
-55°Cto125°C
OV-COASThysteresis0.050.100.155
OV-COASTinputcurrent–10–110µA
LogicInputs
H1,H2,H3lowthreshold0.81.01.25
-55°Cto125°CV
H1,H2,H3highthreshold1.61.92.0
H1,H2,H3inputcurrent-55°Cto125°C,to0V–400–250–120µA
QUADSEL,dirthresholds-55°Cto125°C0.81.43.0V
QUADSELhysteresis70mV
DIRhysteresis0.6V
QUADSELinputcurrent–3050150µA
DIRinputcurrent–30–130
PWMAmp/Comparator
E/AIN(+),E/AIN(–)inputcurrentTo2.5V–5.0–0.15.0µA
PWMINinputcurrentTo2.5V0330
Errorampinputoffset0V<VCOMMON-MODE<3V–1010mV
Errorampvoltagegain7090dB
E/AOUTrange0.253.50V
-55°Cto125°C0.254.55
PullupcurrentTo0V-16–10–5µA
To0V,-55°Cto125°C–17.5-5
SSTARTDischargecurrentTo2.5V0.10.43.0mA
Restartthreshold0.10.20.3V
CurrentAmp
GainISENSE1=0.3V,ISENSE2=0.5Vto0.7V1.751.952.15V/V
LevelshiftISENSE1=0.3V,ISENSE2=0.3V2.42.52.65
Peakcurrentthreshold0.140.200.26V
ISENSE1=0V,forceISENSE2
Overcurrentthreshold0.260.300.36
ISENSE1,ISENSE2inputcurrent–850–3200
To0VµA
ISENSE1,ISENSE2offsetcurrent±2±12
RangeISENSE1,ISENSE2–12V
Tachometer/Brake
TACH-OUThighlevel4.755.3
-55°Cto125°C,10kΩto2.5VV
TACH-OUTlowlevel0.2
Ontime170220280µs
Ontimechangewithtemp-55°Cto125°C0.1%
RC-BRAKEinputcurrentTo0V–4.0–1.9mA
Thresholdtobrake,RC-brake-55°Cto125°C0.81.01.2V
Brakehysteresis,RC-brake0.09
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ELECTRICALCHARACTERISTICS(continued)
Unlessotherwisestated,thesespecificationsapplyfor:TA=25°C;PwrVCC=VCC=12V;ROSC=20kΩtoVREF;COSC=2nF;
RTACH=33kΩ;CTACH=10nF;andalloutputsunloaded.TA=TJ.
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
SPEED-INthreshold-55°Cto125°C220257290mV
SPEED-INinputcurrent–30–530µA
Low-SideDrivers
Voh,–1mA,downfromVCC1.602.50
Voh,–50mA,downfromVCC1.752.45
-55°Cto125°CV
Vol,1mA0.050.4
Vol,50mA0.360.8
Rise/falltime10%to90%slewtime,into1nF50ns
High-SideDrivers
Vol,1mA0.10.4
-55°Cto125°CV
Vol,50mA1.01.8
LeakagecurrentOutputvoltage=50V30µA
Falltime10%to90%slewtime,50mAload50ns
Oscillator
405060
Frequency-40°Cto105°C3565kHz
-55°Cto125°C3080
Reference
Iref=0mA4.95.05.1
OutputvoltageV
-55°Cto125°C4.75.05.3
Loadregulation0mAto–20mAload–40–5mV
Lineregulation10Vto18VVCC–10–110
Shortcircuitcurrent-55°Cto125°C50100150mA
Miscellaneous
Outputturn-ondelay1µs
Outputturn-offdelay1
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BlockDiagram
22
26
25 2
QUAD SEL
RC-OSC
PWM IN
27
28
1
E/A OUT
E/A IN(+)
E/A IN (–)
OSC S Q
R
S
QR
PWM CLOCK
24SSTART
3ISENSE
4ISENSE1
5ISENSE2
19VCC
23OV-COAST
6DIR
7SPEED-IN
2X
2.5 V 250 Ω
2.9 V
Q1
10µA
3.1 V
9 V
DIRECTION
LATCH
0.25 V
PWM CLOCK
8H1
9H2
L
QD
L
QD
L
QD
10H3
+5 V
+5 V
+5 V
EDGE
DETECT
ONE
SHOT
21RC-BRAKE
2k
1 V
DIR COAST CHOP QUAD
H2
H1
H3
BRAKE
DECODER
CROSS
CONDUCTION
PROTECTION
LATCHES
18 PUA
17 PUB
16 PUC
14 PDA
13 PDB
12 PDC
15 GND
20 TACH-OUT
11 PWR VCC
+5 V
VREF
5 V
REFERENCE
PWM
CLOCK
1.75 V
ABS VALUE 0.2 V
UC2625-EP
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DEVICEINFORMATION
UC2625-EP
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..................................................................................................................................................................................................SLUS802–MARCH2008
TerminalFunctions
TERMINALI/ODESCRIPTION
NAMENO.
ThepositiondecoderlogictranslatestheHallsignalsandtheDIRsignaltothe
correctdriversignals(PUsandPDs).Topreventoutputstagedamage,thesignal
onDIRisfirstloadedintoadirectionlatch,thenshiftedthroughatwo-bitregister.
AslongasSPEED-INislessthan250mV,thedirectionlatchistransparent.When
SPEED-INishigherthan250mV,thedirectionlatchinhibitsallchanges
indirection.SPEED-INcanbeconnectedtoTACH-OUTthroughafilter,sothatthe
directionlatchisonlytransparentwhenthemotorisspinningslowly,andhastoo
littlestoredenergytodamagepowerdevices.
Additionalcircuitrydetectswhentheinputandoutputofthedirectionlatchare
DIR,SPEED-IN6,7different,orwhentheinputandoutputoftheshiftregisteraredifferent,andinhibits
alloutputdrivesduringthattime.Thiscanbeusedtoallowthemotortocoasttoa
safespeedbeforereversing.
Theshiftregisterensuresthatdirectioncannotbechangedinstantaneously.The
registerisclockedbythePWMoscillator,sothedelaybetweendirectionchanges
isalwaysgoingtobebetweenoneandtwooscillatorperiods.At40kHz,this
correspondstoadelayofbetween25µsand50µs.Regardlessofoutputstage,
25µsdeadtimeshouldbeadequatetoensurenooverlapcross-conduction.
TogglingDIRcausesanoutputpulseonTACH-OUTregardlessofmotorspeed.
E/AIN(+)andE/AIN(–)arenotinternallycommittedtoallowforawidevarietyof
uses.TheycanbeconnectedtotheISENSE,toTACH-OUTthroughafilter,toan
externalcommandvoltage,toaD/Aconverterforcomputercontrol,ortoanother
opampformoreelegantfeedbackloops.Theerroramplifieriscompensatedfor
unitygainstability,soE/AOUTcanbetiedtoE/AIN(–)forfeedbackandmajor
E/AIN(+),E/AIN(–),E/A1,28,27,loopcompensation.
OUT,PWMIN26E/AOUTandPWMIndrivethePWMcomparator.Forvoltage-modePWM
systems,PWMIncanbeconnectedtoRC-OSC.ThePWMcomparatorclearsthe
PWMlatch,commandingtheoutputstochop.
TheerroramplifiercanbebiasedoffbyconnectingE/AIN(–)toahighervoltage
than/EAIN(+).Whenbiasedoff,E/AOUTappearstotheapplicationasaresistor
toground.E/AOUTcanthenbedrivenbyanexternalamplifier.
AllthresholdsandoutputsarereferredtotheGNDpinexceptforthePDandPU
GND15outputs.
Thethreeshaftpositionsensorinputsconsistofhysteresiscomparatorswithinput
pullupresistors.LogicthresholdsmeetTTLspecificationsandcanbedrivenby
5-VCMOS,12-VCMOS,NMOS,oropen-collectors.
Connecttheseinputstomotorshaftpositionsensorsthatarepositioned120
electricaldegreesapart.Ifnoisysignalsareexpected,zenerclampandfilterthese
H1,H2,H38,9,10inputswith6-VzenersandanRCfilter.Suggestedfilteringcomponentsare1kΩ
and2nF.Edgeskewinthefilterisnotaproblem,becausesensorsnormally
generatemodifiedgraycodewithonlyoneoutputchangingatatime,butriseand
falltimesmustbeshorterthan20µsforcorrecttachometeroperation.Motorswith
60electricaldegreepositionsensorcodingcanbeusedifoneortwoofthe
positionsensorsignalsisinverted.
Thecurrentsenseamplifierhasafixedgainofapproximatelytwo.Italsohasa
built-inlevelshiftofapproximately2.5V.ThesignalappearingonISENSEis:
ISENSE=2.5V+(2×ABS(ISENSE1–ISENSE2))
ISENSE1andISENSE2areinterchangeableandcanbeusedasdifferentialinputs.
Thedifferentialsignalappliedcanbeashighas±0.5Vbeforesaturation.
IfspikesareexpectedonISENSE1orISENSE2,theyarebestfilteredbya
capacitorfromISENSEtoground.Filteringthiswayallowsfastsignalinversionsto
becorrectlyprocessedbytheabsolutevaluecircuit.Thepeak-currentcomparator
ISENSE1,ISENSE2,3,4,5allowsthePWMtoenteracurrent-limitmodewithcurrentinthewindingsnever
ISENSEexceedingapproximately0.2V/RSENSE.Theovercurrentcomparatorprovidesa
fail-safeshutdownintheunlikelycaseofcurrentexceeding0.3V/RSENSE.Then,
softstartiscommanded,andalloutputsareturnedoffuntilthehighcurrent
conditionisremoved.ItisoftenessentialtousesomefilterdrivingISENSE1and
ISENSE2torejectextremespikesandtocontrolslewrate.Reasonablestarting
valuesforfiltercomponentsmightbe250-Ωseriesresistorsanda5-nFcapacitor
betweenISENSE1andISENSE2.Inputresistorsshouldbekeptsmalland
matchedtomaintaingainaccuracy.
Thisinputcanbeusedasanover-voltageshut-downinput,asacoastinput,or
OV-COAST23both.ThisinputcanbedrivenbyTTL,5-VCMOS,or12-VCMOS.
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TerminalFunctions(continued)
TERMINALI/ODESCRIPTION
NAMENO.
TheseoutputscandrivethegatesofN-channelpowerMOSFETsdirectlyorthey
candrivethebasesofpowerDarlingtonsifsomeformofcurrentlimitingisused.
Theyaremeanttodrivelow-sidepowerdevicesinhigh-currentoutputstages.
PDA,PDB,PDC12,13,14Currentavailablefromthesepinscanpeakashighas0.5A.Theseoutputsfeature
atruetotem-poleoutputstage.Bewareofexceedingdevicepowerdissipation
limitswhenusingtheseoutputsforhighcontinuouscurrents.Theseoutputspull
hightoturna“low-side”deviceon(activehigh).
Theseoutputsareopen-collector,high-voltagedriversthataremeanttodrive
high-sidepowerdevicesinhigh-currentoutputstages.Theseareactivelow
outputs,meaningthattheseoutputspulllowtocommandahigh-sidedeviceon.
Theseoutputscandrivelow-voltagePNPDarlingtonsandP-channelMOSFETs
PUA,PUB,PUC16,17,18directly,andcandriveanyhigh-voltagedeviceusingexternalchargepump
techniques,transformersignalcoupling,cascodelevel-shifttransistors,or
opto-isolateddrive(high-speedoptodevicesarerecommended).(See
applications).
ThissupplypincarriesthecurrentsourcedbythePDoutputs.Whenconnecting
PDoutputsdirectlytothebasesofpowerDarlingtons,thePWRVCCpincanbe
PWRVCC11currentlimitedwitharesistor.Darlingtonoutputscanalsobe"BakerClamped"with
diodesfromcollectorsbacktoPWRVCC.(SeeApplications)
Thedevicecanchoppowerdevicesineitheroftwomodes,referredtoas
“two-quadrant”(QuadSellow)and“fourquadrant”(QuadSelhigh).When
two-quadrantchopping,thepulldownpowerdevicesarechoppedbytheoutputof
thePWMlatchwhilethepullupdriversremainon.Theloadchopsintoone
commutationdiode,andexceptforback-EMF,willexhibitslowdischargecurrent
andfasterchargecurrent.Two-quadrantchoppingcanbemoreefficientthan
QUADSEL22four-quadrant.
Whenfour-quadrantchopping,allpowerdriversarechoppedbythePWMlatch,
causingtheloadcurrenttoflowintotwodiodesduringchopping.Thismode
exhibitsbettercontrolofloadcurrentwhencurrentislow,andispreferredinservo
systemsforequalcontroloveraccelerationanddeceleration.TheQUADSELinput
hasnoeffectonoperationduringbraking.
EachtimetheTACH-OUTpulses,thecapacitortiedtoRC-BRAKEdischarges
fromapproximately3.33Vdownto1.67Vthrougharesistor.Thetachometer
pulsewidthisapproximatelyT=0.67RTCT,whereRTandCTarearesistorand
capacitorfromRC-BRAKEtoground.RecommendedvaluesforRTare10kΩto
500kΩ,andrecommendedvaluesforCTare1nFto100nF,allowingtimes
between5µsand10ms.Bestaccuracyandstabilityareachievedwithvaluesin
thecentersofthoseranges.
RC-BRAKEalsohasanotherfunction.IfRC-BRAKEpinispulledbelowthebrake
RC-BRAKE21threshold,thedeviceentersbrakemode.Thismodeconsistsofturningoffallthree
high-sidedevices,enablingallthreelow-sidedevices,anddisablingthe
tachometer.Theonlythingsthatinhibitlow-sidedeviceoperationinbrakingare
low-supply,exceedingpeakcurrent,OV-COASTcommand,andthePWM
comparatorsignal.Thelastofthesemeansthatifcurrentsenseisimplemented
suchthatthesignalinthecurrentsenseamplifierisproportionaltobrakingcurrent,
thelow-sidedeviceswillbrakethemotorwithcurrentcontrol.(Seeapplications)
Simplercurrentsenseconnectionsresultsinuncontrolledbrakingandpotential
damagetothepowerdevices.
TheUC3625canregulatemotorcurrentusingfixed-frequencypulsewidth
modulation(PWM).TheRC-OSCpinsetsoscillatorfrequencybymeansoftiming
resistorROSCfromtheRC-OSCpintoVREFandcapacitorCOSCfromRC-OSC
toGnd.Resistors10kΩto100kΩandcapacitors1nFto100nFworksthebest,
butfrequencyshouldalwaysbebelow500kHz.Oscillatorfrequencyis
approximately:
RC-OSC25F=2/(ROSCxCOSC)
Additionalcomponentscanbeaddedtothisdevicetocauseittooperateasa
fixedoff-timePWMratherthanafixedfrequencyPWM,usingtheRC-OSCpinto
selectthemonostabletimeconstant.
ThevoltageontheRC-OSCpinisnormallyarampofabout1.2Vpeak-to-peak,
centeredatapproximately1.6V.Thisrampcanbeusedforvoltage-modePWM
control,orcanbeusedforslopecompensationincurrent-modecontrol.
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TerminalFunctions(continued)
TERMINALI/ODESCRIPTION
NAMENO.
AnytimethatVCCdropsbelowthresholdorthesensedcurrentexceedsthe
over-currentthreshold,thesoft-startlatchisset.Whenset,itturnsonatransistor
thatpullsdownonSSTART.Normally,acapacitorisconnectedtothispin,andthe
transistorwillcompletelydischargethecapacitor.Acomparatorsenseswhenthe
NPNtransistorhascompletelydischargedthecapacitor,andallowsthesoft-start
latchtoclearwhenthefaultisremoved.Whenthefaultisremoved,thesoft-start
capacitorchargesfromtheon-chipcurrentsource.
SSTARTclampstheoutputoftheerroramplifier,notallowingtheerroramplifier
SSTART24outputvoltagetoexceedSSTARTregardlessofinput.TheramponRC-OSCcan
beappliedtoPWMInandcomparedtoE/AOUT.WithSSTARTdischargedbelow
0.2Vandtherampminimumbeingapproximately1.0V,thePWMcomparator
keepsthePWMlatchclearedandtheoutputsoff.AsSSTARTrises,thePWM
comparatorbeginstoduty-cyclemodulatethePWMlatchuntiltheerroramplifier
inputsovercometheclamp.Thisprovidesforasafeandorderlymotorstart-up
fromanofforfaultcondition.A51-kΩresisterisaddedbetweenVREFand
SSTARTtoensureswitching.
AnychangeintheH1,H2,orH3inputsloadsdatafromtheseinputsintothe
positionsensorlatches.Atthesametimedataisloaded,afixed-width5-Vpulseis
triggeredonTACH-OUT.TheaveragevalueofthevoltageonTACH-OUTis
directlyproportionaltospeed,sothisoutputcanbeusedasatruetachometerfor
speedfeedbackwithanexternalfilteroraveragingcircuitwhichusuallyconsistsof
TACH-OUT20aresistorandcapacitor.
WheneverTACH-OUTishigh,thepositionlatchesareinhibited,suchthatduring
thenoisiestpartofthecommutationcycle,additionalcommutationsarenot
possible.Althoughthiseffectivelysetsamaximumrotationalspeed,themaximum
speedcanbesetabovethehighestexpectedspeed,preventingfalsecommutation
andchatter.
Thisdeviceoperateswithsuppliesbetween10Vand18V.Under-voltagelockout
keepsalloutputsoffbelow7.5V,insuringthattheoutputtransistorsneverturnon
VCC19untilfulldrivecapabilityisavailable.BypassVCCtogroundwithan0.1-µFceramic
capacitor.Usinga10-µFelectrolyticbypasscapacitoraswellcanbebeneficialin
applicationswithhighsupplyimpedance.
Thispinprovidesregulated5VfordrivingHall-effectdevicesandspeedcontrol
circuitry.VREFreaches5VbeforeVCCenables,ensuringthatHall-effectdevices
VREF2poweredfromVREFbecomesactivebeforetheUC3625drivesanyoutput.For
properperformanceVREFshouldbebypassedwithatleasta0.1-µFcapacitorto
ground.
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TYPICALCHARACTERISTICS
On Time
0.001
CT – mF
0.01 0.1
1 ms
10 ms
100 ms
10 ms
1 ms
100 ms
RT – 10 k
RT – 30 k
RT – 100 k
RT – 500 k
0.001 0.01 0.1
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
Oscillator Frequency
COSC (mF)
ROSC – 10 k
ROSC – 10 k
ROSC – 100 k
-75
Temperature – C
-50 -25 0 755025 125100
Supply Current – mA
0
2
4
6
8
10
12
14
16
18
20
-75
Temperature – C
-50 -25 0 755025 125100
Soft Start Current – mA
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
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OscillatorFrequencyTachometeronTime
vsvs
COSCandROSCRTandCT
Figure1.Figure2.
SupplyCurrentSoft-StartPullupCurrent
vsvs
TemperatureTemperature
Figure3.Figure4.
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-75
Temperature – C
-50 -25 0 755025 125100
Soft Start Current – mA
0
.25
.50
.75
1.00
1.25
ISENSE2 – ISENSE1 – V
ISENSE – V
0.50.0-0.5
2.5
3
3.5
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..................................................................................................................................................................................................SLUS802–MARCH2008
TYPICALCHARACTERISTICS(continued)
Soft-StartDischargeCurrentCurrentSenseAmplifierTransferFunction
vsvs
TemperatureISENSE2–ISENSE1
Figure5.Figure6.
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APPLICATIONINFORMATION
CrossConductionPrevention
EDGE
FINDER
SHIFT
REG S Q
QR
S Q
QR
PUA
PDA
PULL
DOWN
PULL UP
FROM
DECODER
PWM
CLK
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TheUC2625insertsdelaystopreventcrossconductionduetooverlappingdrivesignals.However,somethought
mustalwaysbegiventocrossconductioninoutputstagedesignbecausenoamountofdeadtimecanprevent
fastslewingsignalsfromcouplingdrivetoapowerdevicethroughaparasiticcapacitance.
TheUC2625containsinputlatchesthatserveasnoiseblankingfilters.Theselatchesremaintransparentthrough
anyphaseofamotorrotationandlatchimmediatelyafteraninputtransitionisdetected.Theyremainlatchedfor
twocyclesofthePWMoscillator.AtaPWMoscillatorspeedof20kHz,thiscorrespondsto50µsto100µsof
blanktimewhichlimitsmaximumrotationalspeedto100kRPMforamotorwithsixtransitionsperrotationor50
kRPMforamotorwith12transitionsperrotation.
Thispreventsnoisegeneratedinthefirst50µsofatransitionfrompropagatingtotheoutputtransistorsand
causingcross-conductionorchatter.
TheUC2625alsocontainssixflipflopscorrespondingtothesixoutputdrivesignals.Oneoftheseflipflopsisset
everytimethatanoutputdrivesignalisturnedon,andclearedtwoPWMoscillatorcyclesafterthatdrivesignal
isturnedoff.Theoutputofeachflipflopisusedtoinhibitdrivetotheopposingoutput(Figure7).Inthisway,itis
impossibletoturnondriverPUAandPDAatthesametime.Itisalsoimpossibleforoneofthesedriverstoturn
onwithouttheotherdriverhavingbeenoffforatleasttwoPWMoscillatorclocks.
Figure7.CrossConductionPrevention
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PowerStageDesign
UC2625-EP
www.ti.com
..................................................................................................................................................................................................SLUS802–MARCH2008
TheUC2625isusefulinawidevarietyofapplications,includinghigh-powerinroboticsandmachinery.The
poweroutputstagesusedinsuchequipmentcantakeanumberofforms,accordingtotheintendedperformance
andpurposeofthesystem.Figure8showfourdifferentpowerstageswiththeadvantagesanddisadvantagesof
each.
Forhigh-frequencychopping,fastrecoverycirculatingdiodesareessential.Sixarerequiredtoclampthe
windings.Thesediodesshouldhaveacontinuouscurrentratingatleastequaltotheoperatingmotorcurrent,
sincediodeconductionduty-cyclecanbehigh.Forlow-voltagesystems,Schottkydiodesarepreferred.Inhigher
voltagesystems,diodessuchasMicrosemiUHVPhighvoltageplatinumrectifiersarerecommended.
Inapulse-by-pulsecurrentcontrolarrangement,currentsensingisdonebyresistorRS,throughwhichthe
transistor'scurrentsarepassed(Fig.A,B,andC).Inthesecases,RDisnotneeded.Thelow-sidecirculating
diodesgotogroundandthecurrentsenseterminalsoftheUC2625(ISENSE1andISENSE2)areconnectedtoRS
throughadifferentialRCfilter.Theinputbiascurrentofthecurrentsenseamplifiercausesacommonmode
offsetvoltagetoappearatbothinputs,soforbestaccuracy,keepthefilterresistorsbelow2kΩandmatched.
ThecurrentthatflowsthroughRSisdiscontinuousbecauseofchopping.Itflowsduringtheontimeofthepower
stageandiszeroduringtheofftime.Consequently,thevoltageacrossRSconsistsofaseriesofpulses,
occurringatthePWMfrequency,withapeakvalueindicativeofthepeakmotorcurrent.
Tosenseaveragemotorcurrentinsteadofpeakcurrent,addanothercurrentsenseresistor(RDinFig.D)to
measurecurrentinthelow-sidecirculatingdiodes,andoperateinfourquadrantmode(pin22high).The
negativevoltageacrossRDiscorrectedbytheabsolutevaluecurrentsenseamplifier.Withinthelimitations
imposedbyTable1,thecircuitofFig.Bcanalsosenseaveragecurrent.
Copyright©2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13
ProductFolderLink(s):UC2625-EP
TO
MOTOR
RS
FIGURE A
TO
MOTOR
RS
FIGURE B
TO
MOTOR
RS
FIGURE C
TO
MOTOR
RS
RD
FIGURE D
UC2625-EP
SLUS802–MARCH2008..................................................................................................................................................................................................
www.ti.com
Figure8.FourPowerStageDesigns
Table1.ImposedLimitationsforFigure8
CURRENTSENSE
SAFE
2QUADRANT4QUADRANTPOWERREVERSE
BRAKINGPulse-by-PulseAverage
FigureAYesNoNoN0YesNo
FigureBYesYesNoIn4-quadmodeonlyYesYes
FigureCYesYesYesIn4-quadmodeonlyYesNo
FigureDYesYesYesIn4-quadmodeonlyYesYes
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UC2625-EP
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..................................................................................................................................................................................................SLUS802–MARCH2008
Fordriveswherespeediscritical,P-channelMOSFETscanbedrivenbyemitterfollowersasshowninFigure9.
Here,boththelevelshiftNPNandthePNPmustwithstandhighvoltages.Azenerdiodeisusedtolimit
gate-sourcevoltageontheMOSFET.Aseriesgateresistorisnotnecessary,butalwaysadvisabletocontrol
overshootandringing.
High-voltageoptocouplerscanquicklydrivehigh-voltageMOSFETsifaboostsupplyofatleast10Vgreater
thanthemotorsupplyisprovided(SeeFigure10)ToprotecttheMOSFET,theboostsupplyshouldnotbe
higherthan18Vabovethemotorsupply.
Forunder200-V2-quadrantapplications,apowerNPNdrivenbyasmallP-ChannelMOSFETperformswellas
ahigh-sidedriverasinFigure11.Ahighvoltagesmall-signalNPNisusedasalevelshiftandahighvoltage
low-currentMOSFETprovidesdrive.AlthoughtheNPNdoesnotsaturateifusedwithinitslimitations,the
base-emitterresistorontheNPNisstillthespeed-limitingcomponent.
Figure12showsapowerNPNDarlingtondrivetechniqueusingaclamptopreventdeepsaturation.Bylimiting
saturationofthepowerdevice,excessivebasedriveisminimizedandturn-offtimeiskeptfairlyshort.Lackof
baseseriesresistancealsoaddstothespeedofthisapproach.
Figure9.FastHigh-SideP-ChannelDriverFigure10.OptocoupledN-ChannelHigh-SideDriver
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SLUS802–MARCH2008..................................................................................................................................................................................................
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Figure11.PowerNPNHigh-SideDriverFigure12.PowerNPNLow-SideDriver
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FastHigh-SideN-ChannelDriverwithTransformerIsolation
28
7
1
6
5
4
31
2
6
7
4
8
UC3724N UC3725N
1:2
PUA
33kW
3
+12V
1nF5kW100nF
VMOTOR
TO MOTOR
UC2625-EP
www.ti.com
..................................................................................................................................................................................................SLUS802–MARCH2008
AsmallpulsetransformercanprovideexcellentisolationbetweentheUC2625andahigh-voltageN-Channel
MOSFETwhilealsocouplinggatedrivepower.Inthiscircuit(showninFigure13),aUC3724isusedasa
transformerdriver/encoderthatduty-cyclemodulatesthetransformerwitha150-kHzpulsetrain.TheUC3725
rectifiesthispulsetrainforgatedrivepower,demodulatesthesignal,anddrivesthegatewithover2-Apeak
current.
Figure13.FastHigh-SideN-ChannelDriverwithTransformerIsolation
BoththeUC3724andtheUC3725canoperateupto500kHzifthepulsetransformerisselectedappropriately.
Toraisetheoperatingfrequency,eitherlowerthetimingresistoroftheUC3724(1kΩmin),lowerthetiming
capacitoroftheUC3724(500pFmin)orboth.
Ifthereissignificantcapacitancebetweentransformerprimaryandsecondary,togetherwithveryhighoutput
slewrate,thenitmaybenecessarytoaddclampdiodesfromthetransformerprimaryto12Vandground.
Generalpurposesmallsignalswitchingdiodessuchas1N4148arenormallyadequate.
TheUC3725alsohasprovisionsforMOSFETcurrentlimiting.SeetheUC3725datasheetformoreinformation
onimplementingthis.
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ComputationalTruthTable
UC2625-EP
SLUS802–MARCH2008..................................................................................................................................................................................................
www.ti.com
Table2showstheoutputsofthegatedriveandopencollectoroutputsforgivenhallinputcodesanddirection
signals.Numbersatthetopofthecolumnsarepinnumbers.
Thesedevicesoperatewithpositionsensorencodingthathaseitheroneortwosignalshighatatime,neverall
loworallhigh.Thiscodingissometimesreferredtoas"120°Coding"becausethecodingisthesameascoding
withpositionsensorsspaced120magneticdegreesabouttherotor.Inresponsetothesepositionsensesignals,
onlyonelow-sidedriverturnson(gohigh)andonehigh-sidedriverturnson(pulllow)atanytime.
Table2.ComputationalTruthTable
INPUTSOUTPUTS
DIRH1H2H3Low-SideHigh-Side
68910121314161718
1001LHLLHH
1011LLHLHH
1010LLHHLH
1110HLLHLH
1100HLLHHL
1101LHLHHL
0101LLHHLH
0100LLHLHH
0110LHLLHH
0010LHLHHL
0011HLLHHL
0001HLLHLH
X111LLLHHH
X000LLLHHH
18SubmitDocumentationFeedbackCopyright©2008,TexasInstrumentsIncorporated
ProductFolderLink(s):UC2625-EP
21
27
25
22
6
28
1
15
24326
10kW
3kW10kW2 19
20
16
11
20mF
100nF
20mF
100nF +
ROSC
33kW
2200pF
COSC
68kW
RT
3nF
CT
BRAKE
5nF
100nF
23 8 9 10 4 5 7
2nF
2nF
2nF
100nF
10kW
5nF 240W
240W
17
18
14
13
12
3kW
2N3906
100nF
1k
4kW
TO OTHER
CHANNELS
TO OTHER
CHANNELS
10W
2N3904
10W
IRF9350
IRF532
3kW
FROM
HALL
SENSORS
VMOTOR+15V
+5V TO HALL
SENSORS
VREF
0.02
W
RS
TO
MOTOR
0.02
W
RD
REQUIRED
FOR
AVERAGE
CURRENT
SENSING
REQUIRED
FOR BRAKE
AND FAST
REVERSE
100mF
+
UC3625
DIR
QUAD
51kW
VREF
UC2625-EP
www.ti.com
..................................................................................................................................................................................................SLUS802–MARCH2008
Figure14.45-V/8-ABrushlessDCMotorDriveCircuit
N-ChannelpowerMOSFETsareusedforlow-sidedrivers,whileP-ChannelpowerMOSFETsareshownfor
high-sidedrivers.ResistorsareusedtolevelshifttheUC2625open-collectoroutputs,drivingemitterfollowers
intotheMOSFETgate.A12-VzenerclampinsuresthattheMOSFETgate-sourcevoltageneverexceeds12V.
Series10-Ωgateresistorstamegatereactance,preventingoscillationsandminimizingringing.
Theoscillatortimingcapacitorshouldbeplacedclosetopins15and25,tokeepgroundcurrentoutofthe
capacitor.Groundcurrentinthetimingcapacitorcausesoscillatordistortionandslavingtothecommutation
signal.
Thepotentiometerconnectedtopin1controlsPWMdutycycledirectly,implementingacrudeformofspeed
control.Thiscontrolisoftenreferredtoas"voltagemode"becausethepotentiometerpositionsetstheaverage
motorvoltage.Thiscontrolsspeedbecausesteady-statemotorspeediscloselyrelatedtoappliedvoltage.
Pin20(Tach-Out)isconnectedtopin7(SPEEDIN)throughanRCfilter,preventingdirectionreversalwhilethe
motorisspinningquickly.Intwo-quadrantoperation,thisreversalcancausekineticenergyfromthemotortobe
forcedintothepowerMOSFETs.
Adiodeinserieswiththelow-sideMOSFETsfacilitatesPWMcurrentcontrolduringbrakingbyinsuringthat
brakingcurrentwillnotflowbackwardsthroughlow-sideMOSFETs.Dualcurrent-senseresistorsgivecontinuous
currentsense,whetherbrakingorrunninginfour-quadrantoperation,anunnecessaryluxuryfortwo-quadrant
operation.
The68-kΩand3-nFtachometercomponentssetmaximumcommutationtimeat140µs.Thispermitssmooth
operationupto35,000RPMforfour-polemotors,yetgives140µsofnoiseblankingaftercommutation.
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PACKAGE OPTION ADDENDUM
www.ti.com 15-Oct-2015
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
UC2625MDWREP ACTIVE SOIC DW 28 1000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -55 to 125 UC2625EP
V62/08624-01YE ACTIVE SOIC DW 28 1000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -55 to 125 UC2625EP
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PACKAGE OPTION ADDENDUM
www.ti.com 15-Oct-2015
Addendum-Page 2
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF UC2625-EP :
•Catalog: UC2625
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
UC2625MDWREP SOIC DW 28 1000 330.0 32.4 11.35 18.67 3.1 16.0 32.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
UC2625MDWREP SOIC DW 28 1000 367.0 367.0 55.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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