PBL3717A Ver la hoja de datos (PDF) - System Logic Semiconductor

Número de pieza

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Fabricante

PBL3717A

STEPPER MOTOR DRIVER

System Logic Semiconductor 

Figure 5 : Input and Output Sequences for Half Step and Full Step Operation

PBL3717A

APPLICATION INFORMATIONS

Figure 3 shows a typical application in which two

PBL3717A control a two phase bipolar stepper mo-

tor.

Programming

The logic inputs I0 and I1 set at three different levels

the amplitude of the current flowing in the motor

winding according to the truth table of page 2. A high

level on the "PHASE" logic input sets the direction

of that current from output A to output B ; a low level

from output B to output A.

It is recommended that unused inputs are tied to

pin 6 (Vss) or pin 4 (GND) as appropriate to avoid

noise problem.

The current levels can be varied continuously by

changing the ref. voltage on pin 11.

Control of the Motor

The stepper motor can rotate in either directions ac-

cording to the sequence of the input signals. It is

possible to obtain a full step, a half step and a quar-

ter step operation.

Full Step Operation

Both the windings of the stepper motor are ener-

gized all the time with the same current IMA = IMB.

I0 and I1 remain fixed at whatever torque value is re-

quired.

Calling A the condition with winding A energized in

one direction and A in the other direction, the se-

quence for full step rotation is :

AB → AB → AB → AB etc.

For the rotation in the other direction the sequence

must be reserved.

In the full step operation the torque is constant each

step.

Half Step Operation

Power is applied alternately to one winding then

both according to the sequence :

AB → B → AB → A → AB → B → AB → A etc.

Like full step this can be done at any current level ;

the torque is not constant but it is lower when only

one winding is energized.

A coil is turned off by setting I0 and I1 both high.

7/11

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