L6258E

18/24

Figure 12. Typical Application Circuit.

5.2 Motor Selection

Some stepper motor have such high core losses that they are not suitable for switch mode current regulation. Fur-

thermore, some stepper motors are not designed for continuous operating at maximum current. Since the circuit

can drive a constant current through the motor, its temperature might exceed, both at low and high speed operation.

5.3 Unused Inputs

Unused inputs should be connected to the proper voltage levels in order to get the highest noise immunity.

5.4 Notes on PCB Design

We recommend to observe the following layout rules to avoid application problems with ground and anomalous

recirculation current.

The by-pass capacitors for the power and logic supply must be kept as near as possible to the IC.

It's important to separate on the PCB board the logic and power grounds and the internal charge pump circuit

ground avoiding that ground traces of the logic signals cross the ground traces of the power signals.

Because the IC uses the board as a heat sink, the dissipating copper area must be sized in accordance with the

STEPPER

MOTOR

M

12mH 10

Ω

0.33

0.33

21

20

14

35

34

5

OUT2B

SENSE2

OUT2A

SENSE1

OUT1B

OUT1A

PH1

2

I0_1

4

I1_1

3

I2_1

32

I3_1

33

PH2

17

I0_2

15

I1_2

16

I2_2

23

I3_2

22

DISABLE

6

10nF

100nF

1nF

TRI_CAP

7

VS

13,31

VBOOT

12

VCP2

11

VCP1

10

9

GND

1,36

18,19

PWR_GND

VS

27

SIG_GND

28

D97IN626E

VREF1

26

VREF2

29

EA_IN1

30

EA_OUT1

820pF

1M

25

EA_IN2

24

EA_OUT2

820pF

1M

VREF

8

L6258

SOP36

PACKAGE

R2 1M

R1 1M

E