MP6

508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER

MP6508 Rev.1.0

www.MonolithicPower.com

13

6/27/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2017 MPS. All Rights Reserved.

APPLICATION INFORMATION

Driver Mode:

The MP6508 could be configured for both full-

step

and

half-step

modes

by

sequentially

energizing the two windings.

Full-step drive energizes two winding phases at

any

given

time.

The

stator

windings

are

energized as per the sequence shown in Table 3.

There are a total of four steps for one cycle in the

sequence

——

B A

——

B

——

A B

——

.

Half-step energizes the stator windings as per

the sequence shown in Table 4. There are a total

of eight steps for one cycle: ABB A

——

B A

——

 A

——

B

——

 B

——

A B

——

A.

Figure 7 shows the operating waveforms for both

full and half step drives.

AIN1

AIN2

BIN1

BIN2

H

L

H

L

H

L

H

L

0

0

AB

AB

AB

B

AB

AB

AB

AB

A

B

AB

A

AB

Full Step

Half Step

Figure 7 Signal Logic Sequences for Full-Step and

Half-Step

Table 3

Sequence

(Full Step)

1

2

3

4

A

+

+

B

+

+

A

——

+

+

B

——

+

+

Table 4

Sequence

(Half Step)

1

2

3

4

5

6

7

8

A

+

+

+

B

+

+

+

A

——

+

+

+

B

——

+

+

+

Note:

5) A means +VIN between AOUT1 and AOUT2 for winding A,

while A

—

means -VIN between AOUT1 and AOUT2. The same

applies to winding B.

6)

“+” item is the selected winding voltage.