UC1620UC3620Switchmode Driver for 3-∅ Brushless DC MotorsFEATURES•••••••••2A Continuous, 3A Peak OutputCurrent8V to 40V OperationInternal High Gain Amplifier forVelocity Control ApplicationsTTL Compatible Hall InputsMask Programmable Decode LogicPulse-by-Pulse Current LimitingInternal Thermal Shutdown ProtectionUnder-Voltage LockoutAvailable in SP Hermetic PackageDESCRIPTIONThe UC3620 is a brushless DC motor driver capable of decoding anddriving all 3 windings of a 3-phase brushless DC motor. In addition, anon-board current comparator, oscillator, and high gain Op-Amp provideall necessary circuitry for implementing a high performance, choppedmode servo amplifier. Full protection, including thermal shutdown,pulse-by-pulse current limiting, and under-voltage lockout aid in thesimple implementation of reliable designs. Both conducted and radiatedEMI have been greatly reduced by limiting the output dv/dt to 150V/µsfor any load condition.The UC1620SP is characterized for operation over the full military tem-perature range of -55°C to +125°C, while the UC3620SP is charac-terized for 0°C to +70°C. BLOCK DIAGRAM3/971元器件交易网www.cecb2b.com
UC1620UC3620ABSOLUTE MAXIMUM RATINGS (Note 1)Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40VOutput Current, Source or Sink Non-Repetitive (t = 100µsec), lo. . . . . . . . . . . . . . . . . . . . 3A Repetitive (80% on - 20% off; tON = 10ms). . . . . . . . . . 2.5A DC Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2AAnalog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +VccLogic Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +VccTotal Power Dissipation (at TCASE = 75° C) for SP Package (Note 2). . . . . . . . . . . . . . . . . . . . . . . . . . 15WStorage Temperature. . . . . . . . . . . . . . . . . . . . -65°C to +150°COperating Junction Temperature. . . . . . . . . . . -55°C to +150°CCONNECTION DIAGRAMSSP Hermetic Power DILNote 1: All voltages are with respect to ground. Currents arepositive into, negative out of the specified terminal.Note 2: Consult Packaging Section of Databook for thermallimitations and considerations of package.ELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for TA = 0°C to 70°C for 3620; TA= 55°C to +125°C for UC1620; VCC = 20V, RT = 20V, RT = 10k, CT = -2.2nF. TA=TJ.UC3620MINError Amplifier SectionInput Offset VoltageInput Bias CurrentInput Offset CurrentCommon Mode RangeOpen Loop GainUnity Gain BandwidthOutput Sink CurrentOutput Source CurrentCurrent Sense SectionInput Bias CurrentInternal ClampDivider GainInternal Offset VoltageTiming SectionOutput Off TimeUpper Mono ThresholdLower Mono ThresholdDecoder SectionHigh-Level Input VoltageLow-Level Input VoltageHigh-Level Input CurrentLow-Level Input CurrentOutput SectionOutput Leakage CurrentVF1 Schottky DiodeVF1 Substrate DiodeTotal Output Voltage DropVCC = 40VIO = 2AIO = 2AIO = 2A, Note 31.52.23.05002.03.03.61.52.23.015002.03.03.6µAVVV-102.20.810-102.50.810VVµAµA18205.02.02217205.02.023µsVV.425.180.8-2.00.50.21.0-5.575.2201.2.405.170.75-2.00.50.21.0-5.595.2301.25µAVV/VVVcc = 8V to 40V∆VCOMP = 1V to 4VTJ = 25°C, Note 2VCOMP = 1VVCOMP = 4V0801000.8281.5-.251510-2.0250VIN-20751000.8281.5-.251510-2.0250VIN-2mVµAnAVdBMHzmAmATYPMAXMINUC1620TYPMAXPARAMETERTEST CONDITIONSUNIT2元器件交易网www.cecb2b.com
UC1620UC3620ELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for TA = 0°C to 70°C for 3620; TA= 55°C to +125°C for UC1620; VCC = 20V, RT = 20V, RT = 10k, CT = -2.2nF. TA=TJ.UC3620MINOutput Section (cont.)Output Rise TimeOutput Fall TimeUnder Voltage LockoutStartup ThresholdThreshold HysteresisThermal ShutdownJunction TemperatureTotal Standby CurrentSupply Current32553255mANote 2150180150180°C0.58.00.58.0VVRL = 44ΩRL = 44Ω150150150150nsnsTYPMAXMINUC1620TYPMAXPARAMETERTEST CONDITIONSUNITNote 2: These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.Note 3: The total voltage drop is defined as the sum of both top and bottom side driver.TABLE 1STEP123456123456FWD/REV111111000000Ha111000111000Hb001110001110Hc100011100011AOUTHHOLLOLLOHHOBOUTLOHHOLHOLLOHCOUTOLLOHHOHHOLLHall lines require pull-up resistors.CURRENT SENSINGReferring to Figure 1, emitter current is sensed across RSand fed back through a low pass filter to the currentsense pin 7. This filter is required to eliminate false trig-gering of the monostable due to leading edge currentspikes. Actual filter values, although somewhat depend-ent on external loads, will generally be in the 1kΩ and1000pF range.TIMINGAn R-C time constant on pin 9 is used by the monostableto generate a fixed off time at the outputs according to theformula: TOFF = .916RTCTAs the peak current in the emitters approaches the valueat the minus (-) input of the on-board comparator, themonostable is triggered, causing the outputs to be turnedH = HIGH OUTPUTL = LOW OUTPUTO = OPEN OUTPUTCIRCUIT DESCRIPTIONThe UC3620 is designed for implementation of a com-plete 3-∅ brushless DC servo drive using a minimumnumber of external components. Below is a functional de-scription of each major circuit feature.DECODERTable 1 shows the decoding scheme used in the UC3620to decode and drive each of three high current totem poleoutput stages. A forward/reverse signal, pin 13, is used toprovide direction. At any point in time, one driver is sour-cing, one driver is sinking, and the remaining driver is offor tri-stated. Pulse width modulation is accomplished byturning the sink driver off during the monostable resettime, producing a fixed off-time chop mode. Controlledoutput rise and fall times help reduce electrical switchingnoise while maintaining relatively small switching losses.Figure 1. Current Sense Filter3元器件交易网www.cecb2b.com
UC1620UC3620CIRCUIT DESCRIPTION (cont.)off. On time is determined by the amount of time requiredfor motor current to increase to the value required to re-trip the monostable. A timing sequence of these events isshown in Figure 2.tive (-) input will limit peak current to a maximum value. Afixed 0.5V internal clamp has been included on theUC3620, and any current spike in the output which gen-erates a sensed voltage greater than 0.5V will immedi-ately shut down the outputs. Actual peak current valuesmay be programmed by selecting the appropriate value ofRS according to the formula:RS = 0.5ICURRENTLIMITFigure 2. Chopped Mode Timing DiagramCURRENT LIMITSince peak current is being controlled at all times by theinternal comparator, a simple voltage clamp at its nega-tive (-) input will limit peak current to a maximum value. Afixed 0.5V internal clamp has been included on theUC3620, and any current spike in the output which gener-ates a sensed voltage greater than 0.5V will immediatelyshut down the outputs. Actual peak current values may beprogrammed by selecting the appropriate value of RS ac-cording to the formula:ERROR AMPLIFIER LIMITA high performance, on-board error amplifier is includedto facilitate implementing closed loop motor control. Errorvoltage generation and loop compensation are easily ac-complished by appropriately configuring the gain andfeedback of this amplifier. To provide a larger dynamic sig-nal range at the output of the error amplifier, a divide by 5resistor network is used to reduce the error signal levelbefore applying to the internal comparator. In addition, aone volt offset has been introduced at the output of theerror amplifier to guarantee control down to zero currentin the output stages. Since this offset is divided by theopen loop gain of the feedback loop, it has virtually no ef-fect on closed loop performance.PROTECTION FUNCTIONSProtective functions including under-voltage lockout, peakcurrent limiting, and thermal shutdown, provide an ex-tremely rugged device capable of surviving under manytypes of fault conditions. Under-voltage lockout guaran-tees the outputs will be off or tri-slated until VCC is suffi-cient for proper operation of the chip. Current limitinglimits the peak current for a stalled or shorted motor,whereas thermal shutdown will tri-state the outputs if atemperature above 150°C is reached.RS = 0.5ICURRENTLIMITSince peak current is being controlled at all times by theinternal comparator, a simple voltage clamp at its nega-4元器件交易网www.cecb2b.com
UC1620UC3620TYPICAL APPLICATIONS*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package.3-∅ Brushless DC Open Loop Motor Drive*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package. 3-∅ Brushless DC Open Loop Motor with Current Limit at 2A.5元器件交易网www.cecb2b.com
UC1620UC3620*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package.Closed Loop Speed Control ServoUNITRODE CORPORATION7 CONTINENTAL BLVD. • MERRIMACK, NH 03054TEL. (603) 424-2410 • FAX (603) 424-34606元器件交易网www.cecb2b.com
PACKAGEOPTIONADDENDUM
www.ti.com
30-Mar-2005
PACKAGINGINFORMATION
OrderableDevice
UC1620SPUC1620SP883BUC1620SP883CUC3620SPUC3620VUC3620VH
(1)
Status(1)OBSOLETEOBSOLETEOBSOLETEOBSOLETEOBSOLETEOBSOLETE
PackageTypePackageDrawingUTRUTRUTRUTRUTRUTR
PinsPackageEcoPlan(2)
Qty2424241515
TBDTBDTBDTBDTBDTBD
Lead/BallFinish
CallTICallTICallTICallTICallTICallTI
MSLPeakTemp(3)CallTICallTICallTICallTICallTICallTI
Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable.OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)
EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS)orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-Free/Greenconversionplanhasnotbeendefined.
Pb-Free(RoHS):TI'sterms\"Lead-Free\"or\"Pb-Free\"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses.
Green(RoHS&noSb/Br):TIdefines\"Green\"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial)
(3)
MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
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Addendum-Page1
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