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TISpinsMotorsSmarter.Safer.Greener.DRV8xProductsDeepDivingDRV8x系列產品之深度解析TANG,Zhao/唐釗MotorApplicationTeam/馬達應用團隊TexasInstruments/德州儀器September2012/二零一二年九月SelectiveDisclosureWhatCanDRV8xDo?DRV8x可實現什麼？StepperMotorDriver步進馬達驅動•1.8V~60V;0~12A•HighCountµ-SteppingIndexer高細分微步進索引•CurrentRegulation/Control電流調節/控制BrushedDCMotorDriver有刷DC馬達驅動•1.8V~60V;0~24A•InrushCurrent/Stallprotection突波電流/堵轉保護3-PhaseBLDCMotorDriver三相BLDC馬達驅動•8V~60V;0~13A•Integratedcurrentsenseamps/buck整合電流感應放大器/降壓•Pre-drivers&drivers(w/integratedFETs)門級驅動器/整合MOSFETOpenLoopControl開放迴路控制Simplicity&LowCost易設計，低成本Reliability&Efficiency可靠、高效SelectiveDisclosure•ShortCircuit,OverCurrent,Thermal,UVLO…•短路/過電流/過熱保護、欠壓封鎖•…•Upto20xsmallerthandiscretesolutions!•比離散解決方案少20倍的面積！•EVMrequiresNOdiscretedesignexperience→quickertimetomarket!•EVM無需離散設計經驗→加速產品的上市時程！•UltraefficientarchitectureshelpyouminimizeMCUsupport！•超高效的系統架構將MCU所需支援降至最低！ChargePump20transistorsVMVCP-Power-upReset10trans.ClockOscillator15trans.LinearReg15transistorsVGDVMLinearReg15transistorsVDD+3.3VHSpre-drive30transVCPILimit+-DigitalLogic5,000gatesTemperaturesense10trans.LSpre-drive30trans.VCPVMVMVMHSpre-drive30trans.LSpre-drive30trans.AmpOUT1OUT2VREFVPROPIVDDFAULTOCPOCPCompOp-ampReducedBoardSpace/減少電路板空間FullyProtected/全面保護EmbeddedIntelligence/嵌入式智能DropinandSpin/即插即轉DRV8xFamilyFeatureIntroDRV8x系列産品特性介紹HowtoSelectYourDRV8x:ByMotorType:•Stepper,BrushedDC,BLDC,Solenoid/RelayByPowerSource/CurrentCapability:•Line-powered,Battery-poweredByFeature:•Motionprofile,Currentregulation,Sleepmode,Thermalperformance,Formfactor…如何選擇適合您的DRV8x:根據馬達類型:•步進馬達、有刷DC、BLDC、電磁/繼電器根據供電類型/電流量:•電源供電、電池供電根據特性:•動態分析、電流調節、休眠模式、熱效能、尺寸大小…SelectiveDisclosureDRV8xV.S.Discretes/DRV8x系列V.S.離散元件DiscreteH-BridgeMotorDriver離散H橋接馬達驅動器ShortCircuitProtectionFuse短路保險絲+11VSupplySmaller/更小BetterPerformance/效能更好Thermal&ShortCircuitProtection/過熱&短路保護Shoot-ThroughProtection/擊穿保護UVLO&ESDProtection/欠壓封鎖及ESD保護DRV8x:DropinandSpin!DRV8x：即插即轉！SelectiveDisclosureWhatwillbeintroducednextare…接下來將介紹…•DRV8818–2.5AStepperDriver•DRV8837–1.8ALowVoltageBrushedDCDriver•DRV8844–2.5AHalfBridgeDriver•DRV8818–2.5A步進馬達驅動器•DRV8837–1.8A低電壓直流有刷馬達驅動器•DRV8844–2.5A半橋驅動器And…DRV8xoperationphilosophy以及…DRV8x系列産品的操作原理New!!新品上市!!New!!新品上市!!SelectiveDisclosureDRV8818–2.5AStepperMotorDriver(withOn-Chip1/8µ-SteppingIndexer)DRV8818–2.5A步進馬達驅動器（內建整合1/8細分索引）Applications/應用範圍•Printer/印表機•Scanner/掃描機•TextileMachinery/紡織機械•Positioning&Tracking/定位&追蹤•FactoryAutomation/工廠自動化•Robotics/機器人技術9.7x6.4mm,28-pinHTSSOPpackageController8to35VDRV8818MotorDriver3to5.5VStep/DirectionStepsizeM1/8u-steps特性•雙H橋接步進電動驅動器•供電電壓:8~35V•輸出電流:每繞組1.75ARMS/2.5A峰值•DRV8811的接腳相容升級版，Rdson更低(0.37ΩHS+LS)•內建索引支援最高1/8細分•可程式的混合電流衰變（快速衰變+緩慢衰變）模式•包含過電流、過熱、擊穿與欠壓封鎖等整合保護特性•可接腳兼容代替其他公司的一些產品，同時運行溫度要低超過30%9.7x6.4mm,28腳HTSSOP封裝Features•DualH-Bridgesteppermotordriver•Supplyvoltage:8~35V•Outputcurrent:1.75ARMS/2.5Apeakperwinding•P2PupgradetoDRV8811withlowerRdson(0.37ΩHS+LS)•On-chipindexersupportsupto1/8micro-stepping•Programmablemixed(fast+slow)decaymode•Integratedprotectionfeaturesincludingover-current,thermal,shoot-throughandUVLOprotection•P2Preplacementforcompetitors,andrunsupto30%cooler.SelectiveDisclosureDRV8818FunctionalBlockDiagramDRV8818原理方框圖1.75Acontinuous2.5Apeak1.75A連續2.5A峰值µ-stepping(full,1/2,1/4,1/8)微步進設置(full,1/2,1/4,1/8)Step/Directioncontrol步進/轉向控制Currentsense電流感應PWMblankingandofftimesettingPWM消隱/關斷時間設定Decaymodesetting電流衰減模式設定3~5.5V8~35V•NCHpowerMOSFETs/N通道功率MOSFET•Pre-driver/前置驅動器•PWM/脈衝寬度調變•CurrentRegulation/電流調節Built-inchargepump內置充電泵SelectiveDisclosureµ-Stepping微步進細分•1bipolarsteppermotor→2H-bridges,2phases.•2Phasesarealternatedinaspecificsequencetoobtainthedesiredsteppingrateanddirection.•Onlywhenfullcurrentflowsthroughthewindings,thestepperis“full-stepped”.BipolarVBBAAHAALABHABLVBBBAHBALBBHBBLAABAABBBAAHABLAALABHBAHBBLBALBBHBipolarMotorandDrive•1個雙極步進馬達→2個H橋接，雙相位•馬達的雙相交替開關生成一組驅動狀態，這組狀態的交替頻率與順序決定馬達的步進速度與方向.•當馬達持續在完全電流狀態下運轉時，該步進馬達被稱爲“全步運轉”.•Fullstep–4states/全步運行–4個狀態•Mechanicalnoise/機械雜訊•Limitedpositionresolution/有限的馬達位置解析度•Highpowerloss/功率損耗較大SelectiveDisclosureµ-Stepping微步進細分•ByPWMchoppingthecurrentthroughwindingsisregulatedtoamulti-levelwaveform(e.g.sine),andafullstepisdividedintomultiplesmallersteps–µstepping.•Lessmechanicalnoise•Higherpositionresolution•Lesspowerdissipation8MicroSteps8MicroSteps1Step1StepAABACurrentAACurrentBA1StepBipolarVBBAAHAALABHABLVBBBAHBALBBHBBL•PWM將線圈中的電流調製成爲一種波形（如正弦波），馬達的全步步進也被細分成爲很多更小的步進，是爲微步進細分。•更小的機械雜訊•更高的位置解析度•更少的功率損耗SelectiveDisclosureDRV8818µSteppingCurrentWaveformExampleDRV8818微步進細分電流波形範例Fullstepping全步步進1/4µ-stepping1/4細分1/2µ-stepping1/2細分1/8µ-stepping1/8細分SelectiveDisclosureAnotheru-SteppingForm:ModulatingVREF另一種微步進細分的方式：調變VREFMSP430F1612DRV8812ENABLEAENABLEBPHASEAPHASEBVREFAVREFBDAC0DAC1PHASEVREFWindingCurrentAppNote:DownloadSLVA416@!!!使用說明：立即透過！！！PHASEABPHASECDVrefABVrefCDCurrentABCurrentCD1StepSelectiveDisclosureInductiveRecirculationCurrents電感再循環電流AppliedPWMMotorVoltageMotorCurrentMotorwindings→inductors馬達繞組→電感WhilePWM=Low,currentcontinuestoflo