(带图纸和文档）lmd18200直流电机驱动器dxp单片机资料
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lmd18200
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(带图纸和文档）lmd18200直流电机驱动器dxp单片机资料,图纸,以及,文档,lmd18200,直流电机,驱动器,dxp,单片机,资料
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LMD182003A, 55V H-BridgeGeneral DescriptionThe LMD18200 is a 3A H-Bridge designed for motion controlapplications. The device is built using a multi-technology pro-cess which combines bipolar and CMOS control circuitrywith DMOS power devices on the same monolithic structure.Ideal for driving DC and stepper motors; the LMD18200 ac-commodates peak output currents up to 6A. An innovativecircuit which facilitates low-loss sensing of the output currenthas been implemented.Featuresn Delivers up to 3A continuous outputn Operates at supply voltages up to 55Vn Low RDS(ON) typically 0.3 per switchn TTL and CMOS compatible inputsn No “shoot-through” currentn Thermal warning flag output at 145Cn Thermal shutdown (outputs off) at 170Cn Internal clamp diodesn Shorted load protectionn Internal charge pump with external bootstrap capabilityApplicationsn DC and stepper motor drivesn Position and velocity servomechanismsn Factory automation robotsn Numerically controlled machineryn Computer printers and plottersFunctional DiagramDS010568-1FIGURE 1. Functional Block Diagram of LMD18200December 1999LMD18200 3A, 55V H-Bridge 1999 National Semiconductor CorporationDS010568Connection Diagrams and Ordering InformationDS010568-211-Lead TO-220 PackageTop ViewOrder Number LMD18200TSee NS Package TA11BDS010568-2524-Lead Dual-in-Line PackageTop ViewOrder Number LMD18200-2D-QV5962-9232501VXALMD18200-2D/8835962-9232501MXASee NS Package DA24BLMD182002Absolute Maximum Ratings(Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.Total Supply Voltage (VS, Pin 6)60VVoltage at Pins 3, 4, 5, 8 and 912VVoltage at Bootstrap Pins(Pins 1 and 11)VOUT+16VPeak Output Current (200 ms)6AContinuous Output Current (Note 2)3APower Dissipation (Note 3)25WPower Dissipation (TA= 25C, Free Air)3WJunction Temperature, TJ(max)150CESD Susceptibility (Note 4)1500VStorage Temperature, TSTG40C to +150CLead Temperature (Soldering, 10 sec.)300COperating Ratings(Note 1)Junction Temperature, TJ40C to +125CVSSupply Voltage+12V to +55VElectrical Characteristics(Note 5)The following specifications apply for VS= 42V, unless otherwise specified. Boldface limits apply over the entire operatingtemperature range, 40C TJ +125C, all other limits are for TA= TJ= 25C.SymbolParameterConditionsTypLimitUnitsRDS(ON)Switch ON ResistanceOutput Current = 3A (Note 6)0.330.4/0.6 (max)RDS(ON)Switch ON ResistanceOutput Current = 6A (Note 6)0.330.4/0.6 (max)VCLAMPClamp Diode Forward DropClamp Current = 3A (Note 6)1.21.5V (max)VILLogic Low Input VoltagePins 3, 4, 50.1V (min)0.8V (max)IILLogic Low Input CurrentVIN= 0.1V, Pins = 3, 4, 510A (max)VIHLogic High Input VoltagePins 3, 4, 52V (min)12V (max)IIHLogic High Input CurrentVIN= 12V, Pins = 3, 4, 510A (max)Current Sense OutputIOUT= 1A (Note 8)377325/300A (min)425/450A (max)Current Sense Linearity1A IOUT 3A (Note 7)69%Undervoltage LockoutOutputs turn OFF9V (min)11V (max)TJWWarning Flag TemperaturePin 9 0.8V, IL= 2 mA145CVF(ON)Flag Output Saturation VoltageTJ= TJW, IL= 2 mA0.15VIF(OFF)Flag Output LeakageVF= 12V0.210A (max)TJSDShutdown TemperatureOutputs Turn OFF170CISQuiescent Supply CurrentAll Logic Inputs Low1325mA (max)tDonOutput Turn-On Delay TimeSourcing Outputs, IOUT= 3A300nsSinking Outputs, IOUT= 3A300nstonOutput Turn-On Switching TimeBootstrap Capacitor = 10 nFSourcing Outputs, IOUT= 3A100nsSinking Outputs, IOUT= 3A80nstDoffOutput Turn-Off Delay TimesSourcing Outputs, IOUT= 3A200nsSinking Outputs, IOUT= 3A200nstoffOutput Turn-Off Switching TimesBootstrap Capacitor=10 nFSourcing Outputs, IOUT= 3A75nsSinking Outputs, IOUT= 3A70nstpwMinimum Input Pulse WidthPins 3, 4 and 51stcprCharge Pump Rise TimeNo Bootstrap Capacitor20sLMD182003Electrical Characteristics NotesNote 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when op-erating the device beyond its rated operating conditions.Note 2: See Application Information for details regarding current limiting.Note 3: The maximum power dissipation must be derated at elevated temperatures and is a function of TJ(max), JA, and TA. The maximum allowable power dis-sipation at any temperature is PD(max)=(TJ(max) TA)/JA, or the number given in theAbsolute Ratings, whichever is lower. The typical thermal resistance from junc-tion to case (JC) is 1.0C/W and from junction to ambient (JA) is 30C/W. For guaranteed operation TJ(max)=125C.Note 4: Human-body model, 100 pF discharged through a 1.5 k resistor. Except Bootstrap pins (pins 1 and 11) which are protected to 1000V of ESD.Note 5: All limits are 100% production tested at 25C. Temperature extreme limits are guaranteed via correlation using accepted SQC (Statistical Quality Control)methods. All limits are used to calculate AOQL, (Average Outgoing Quality Level).Note 6: Output currents are pulsed (tW2 ms, Duty Cycle30V) so someprecautions are in order. Proper heat sink design is essentialand it is normally necessary to heat sink the VCCsupply pin(pin 6) with 1 square inch of copper on the PCB.DS010568-24FIGURE 4. Transitions in Brake, Direction, or PWM Must Be Separated By At Least 1 secLMD182007Application Information(Continued)INTERNAL CHARGE PUMP AND USE OF BOOTSTRAPCAPACITORSTo turn on the high-side (sourcing) DMOS power devices,the gate of each device must be driven approximately 8Vmore positive than the supply voltage. To achieve this an in-ternal charge pump is used to provide the gate drive voltage.As shown inFigure 5, an internal capacitor is alternatelyswitched to ground and charged to about 14V, then switchedto V supply thereby providing a gate drive voltage greaterthan V supply. This switching action is controlled by a con-tinuously running internal 300 kHz oscillator. The rise time ofthis drive voltage is typically 20 s which is suitable for oper-ating frequencies up to 1 kHz.For higher switching frequencies, the LMD18200 providesfor the use of external bootstrap capacitors. The bootstrapprinciple is in essence a second charge pump whereby alarge value capacitor is used which has enough energy toquickly charge the parasitic gate input capacitance of thepower device resulting in much faster rise times. The switch-ing action is accomplished by the power switches them-selvesFigure 6. External 10 nF capacitors, connected fromthe outputs to the bootstrap pins of each high-side switchprovide typically less than 100 ns rise times allowing switch-ing frequencies up to 500 kHz.INTERNAL PROTECTION DIODESA major consideration when switching current through induc-tive loads is protection of the switching power devices fromthe large voltage transients that occur. Each of the fourswitches in the LMD18200 have a built-in protection diode toclamp transient voltages exceeding the positive supply orground to a safe diode voltage drop across the switch.The reverse recovery characteristics of these diodes, oncethe transient has subsided, is important. These diodes mustcome out of conduction quickly and the power switches mustbe able to conduct the additional reverse recovery current ofthe diodes. The reverse recovery time of the diodes protect-ing the sourcing power devices is typically only 70 ns with areverse recovery current of 1A when tested with a full 6A offorward current through the diode. For the sinking devicesthe recovery time is typically 100 ns with 4A of reverse cur-rent under the same conditions.Typical ApplicationsFIXED OFF-TIME CONTROLThis circuit controls the current through the motor by apply-ing an average voltage equal to zero to the motor terminalsfor a fixed period of time, whenever the current through themotor exceeds the commanded current. This action causesthe motor current to vary slightly about an externally con-trolled average level. The duration of the Off-period is ad-justed by the resistor and capacitor combination of theLM555. In this circuit the Sign/Magnitude mode of operationis implemented (see Types of PWM Signals).DS010568-6FIGURE 5. Internal Charge Pump CircuitryDS010568-7FIGURE 6. Bootstrap CircuitryLMD182008Typical Applications(Continued)TORQUE REGULATIONLocked Anti-Phase Control of a brushed DC motor. Current sense output of the LMD18200 provides load sensing. The LM3525Ais a general purpose PWM controller. The relationship of peak motor current to adjustment voltage is shown inFigure 10.DS010568-10FIGURE 7. Fixed Off-Time ControlDS010568-11FIGURE 8. Switching WaveformsLMD182009Typical Applications(Continued)VELOCITY REGULATIONUtilizes tachometer output from the motor to sense motor speed for a locked anti-phase control loop. The relationship of motorspeed to the speed adjustment control voltage is shown inFigure 12.DS010568-12FIGURE 9. Locked Anti-Phase Control Regulates TorqueDS010568-13FIGURE 10. Peak Motor Currentvs Adjustment VoltageLMD1820010Typical Applications(Continued)DS010568-14FIGURE 11. Regulate Velocity with Tachometer FeedbackDS010568-15FIGURE 12. Motor Speed vsControl VoltageLMD1820011Physical Dimensionsinches (millimeters) unless otherwise noted11-Lead TO-220 Power Package (T)Order Number LMD18200TNS Package Number TA11BLMD1820012Physical Dimensionsinches (millimeters) unless otherwise noted (Continued)LIFE SUPPORT POLICYNATIONALS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERALCOUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:1. Life support devices or systems are devices orsystems which, (a) are intended for surgical implantinto the body, or (b) support or sustain life, andwhose failure to perform when properly used inaccordance with instructions for use provided in thelabeling, can be reasonably expected to result in asignificant inj
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