资 源 简 介
The L297 Stepper Motor Controller is primarily intendedforusewith anL298Nor L293Ebridge driverin stepper motor driving applicaTIons.It receives control signals fromthe system’s controller,usually a microcomputer chip, and provides allthe necessarydrive signals for the power stage.AddiTIonally,it includestwoPWMchoppercircuits toregulatethe current in the motor windings.With a suitable power actuator the L297 drives twophase bipolar permanentmagnet motors, four phaseunipolarpermanentmagnetmotorsandfourphasevariable reluctancemotors.Moreover, it handlesnormal,wave drive and half step drivemodes. (Thisis all explained in the secTIon ”Stepper Motor Basics”).Two versions of the device are available : the regularL297 and a special version called L297A. TheL297A incorporates a step pulse doubler and is designedspecifically for floppy-disk head posiTIoningapplications.
