MP6508A

– 18V, 1.2A STEPPER MOTOR DRIVER IN A QFN-16 (3MMx3MM) PACKAGE

MP6508A Rev. 1.0

MonolithicPower.com

12

4/12/2023

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© 2023 MPS. All Rights Reserved.

APPLICATION INFORMATION

Driver Mode

The MP6508A can be configured for full-step

mode and half-step mode by energizing the two

windings sequentially.

The

full-step

drive energizes two winding

phases at any given time. Table 3 shows the

full-step sequence in which the stator windings

are energized.

Table 3: Full-Step Drive Sequence (8)

Sequence

(Full Step)

1

2

3

4

A

+

N/A

N/A

+

B

+

+

N/A

N/A

A

——

N/A

+

+

N/A

B

——

N/A

N/A

+

+

There are a total of four steps in one cycle of

the full-step drive sequence: AB→ A

——

B→ A

——

B

——

→A

B

——

. (7)

Table 4 shows the half-step sequence in which

the stator windings are energized.

Table 4: Half-Step Drive Sequence (8)

Sequence

(Half-Step)

1

2

3

4

5

6

7

8

A

+

N/A N/A N/A N/A N/A

+

+

B

+

+

+

N/A N/A N/A N/A N/A

A

——

N/A N/A

+

+

+

N/A N/A N/A

B

——

N/A N/A N/A N/A

+

+

+

N/A

There are a total of eight steps in one cycle of

the half-step drive sequence: AB→B→ A

——

B→ A

——

→ A

——

B

——

→ B

——

→A B

——

→A.

Notes:

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

while A

—

means -VIN between AOUT1 and AOUT2. The

same applies to winding B.

8)

“+” is the selected winding voltage.

Figure 7 shows the operating waveforms for

both full-step and half-step drives.

AIN1

AIN2

BIN1

BIN2

H

L

H

L

H

L

H

L

AOUT1 - AOUT2

BOUT1 - BOUT2

+VIN

-VIN

0

+VIN

-VIN

0

AB

AB

AB

B

AB

AB

AB

AB

A

B

AB

A

AB

Full Step

Half-Step

Figure 7: Signal Logic Sequences for the Full-

Step and Half-Step Drives

Design Example

Table 5 shows the specifications for a design

example based on the application guidelines.

Table 5: Design Example

VIN

IOUT

2.7V to 18V

1.2A

For the detailed application schematic, see

Figure

9

on

page

14.

See

the

Typical

Performance Characteristics section on page 7

for

the

typical

performance

and

circuit

waveforms. Refer to the related EV6508A-Q-

00A datasheet for more details on applications.