• Stepper Motor Driver Ic L297 Pdf Free
• Stepper Motor Driver Circuit
• Stepper Motor Driver Ic L297 Pdf Free

Stepper Motor controller L298 L297Stepper Motor Driver using L298 and L297For additionalstepper motor drivers see the Links below.Click the image to enlargeIntroductionThis Stepper motor controlleruses theanddriver combination; it canbe used as stand alone or controlled by microcontroller. It is designed toaccept step pulses at up to 25,000 per second.

Stepper Motor Driver Ic L297 Pdf Free

An on-board step pulse generatorcan be used if desired (40-650 pps range). Single supply operation is standardAll eight inputs are pulled up to +5V by RP1 (4.7K) and are buffered by74HC244. The output driver is capable of driving up to 2Amp into each phase of atwo-phase bipolar step motor. The motor winding current is limited by means of a35KHZ-chopper scheme. The potentiometer (R6) is for varying the windingcurrents.

Stepper Motor Driver Circuit

The nature of the chopping scheme eliminates the need for externalcurrent limiting resistors on the motor windings; this simplifies connectionsand increases efficiency.A useful of this design is the 'idle' current reduction mode. The amount ofreduction is fixed at approximately 50% from whatever the running current is setat. Similarly, the motor current can be commanded to shut entirely off.The internal +5V voltages required for operation are derived from the steppermotor supply.

The motor supply voltages should be at least 9V, but must neverexceed 32V.J3 Pin Functions Step pulse (J3-2)Incrementsthe motor step counts in the selected direction by one step or haftstep. The increment is triggered on the negative edge of the inputpulse.CW/CCW (J3-3)A logichigh on the input selects step advances to be made in the clockwisedirection, If it is logic low, step advances will be make in counterclockwise directionHalf/Full (J3-4)The inputcan select between 3 operation modes. When left disconnected or drivenhigh, the half step mode is selected. When brought low, this line selectthe full step or wavedrive modes.

Stepper Motor Driver Ic L297 Pdf Free

The selection between these modes isdetermined by the time of the transition (more detail later)Home (J3-5)When thisline is low, the controller is reset to a know 'Home' stateRun/Idle (J3-6)A logichigh on this input allow full current operation (As set by R6 control),A logic low reduces the winding current to approximately 50% of thenormal 'Run' setpoint current. This ratio is fixed by R4 & R5On/Off (J3-7)A logichigh on this input allows current to be applied to the motor windings, Alogic low disables the output driverClock out (J3-8)The outputclock pulse, It is variable from 40-650pps.Home output (J3-9)A high onthis pin indicates the controller is in the 'Home' stateStep Pulse SpecificationThe minimum Step pulse width is 1usec, and can remain low indefinitely ifneeded. It must be high for at least 1usec between pulses, and may not repeatmore than 25,000 times per second.Current ReductionThis Stepper motor driver design has the ability to reduce the current supplied to thestepper motorwindings by about 50% upon command. When the J3-6 line is brought low, thecurrent regulating chopper logic is set to 50% of the normally set currentlevel.

It is not recommended to run the stepping motions at this low current.Further it is advisable to allow the stepper motor to remain at full current for atleast 0.2 sec past the completion of a motion. Equal interval system lessons.