DRV102

19

SBVS009A

www.ti.com

FIGURE 22. Three-Phase Stepper Motor Driver Provides High-Stepping Torque.

FIGURE 23. Soft-Start Circuit for Incandescent Lamps and Other Sensitive Loads.

FIGURE 21. Constant Current Output Drive.

DRV102

1

34

R

2

V

R

1

R

3

4.87k

Ω

R

4

4.87k

Ω

C

1

20

µF

+

4.3V

DIN5229

Duty Cycle Adjust

after soft start

Select R

down V

For example: with V

R

V

• 60V = 5V

Sets start-up

duty cycle

1k

Ω

1k

Ω + 11kΩ

5

V

S

6

Out

2

Delay Adjust

DRV102

Phase 3

Stepper

Logic In

6

5

V

S

DRV102

Phase 2

Stepper

Logic In

6

5

V

S

DRV102

Phase 1

Stepper

Logic In

6

5

Motor

Only one DRV102 is

turned on at sequence time.

V

S

+24V

On

Off

Duty Cycle

Adjust

Delay

Adjust

V

Z

Load

R

SHUNT

0.1

Ω

DRV102

3

2

1

5

Current Set

0.6V gives ~ 90% Duty Cycle

3.7V gives ~ 10% Duty Cycle

Out

6

4

V

S

V

Z

2k

Ω

100k

Ω

25k

Ω

5.1V

Zener

1k

Ω

100k

Ω

5k

Ω

OPA237

0.1

µF

0.1

µF