L6228 STMicroelectronics, L6228 Datasheet - Page 19

• Manufacturer Part Number: L6228
• Description: DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
• Manufacturer: STMicroelectronics

APPLICATION INFORMATION
A typical Bipolar Stepper Motor Driver application using L6228 is shown in Fig. 23. Typical component values
for the application are shown in Table 2. A high quality ceramic capacitor in the range of 100 to 200 nF should
be placed between the power pins (VS
filtering on the power supply and reduce high frequency transients generated by the switching. The capacitor
connected from the EN input to ground sets the shut down time when an over current is detected (see Overcur-
rent Protection). The two current sensing inputs (SENSE
resistors with a trace length as short as possible in the layout. The sense resistors should be non-inductive re-
sistors to minimize the di/dt transients across the resistor. To increase noise immunity, unused logic pins (except
EN) are best connected to 5V (High Logic Level) or GND (Low Logic Level) (see pin description). It is recom-
mended to keep Power Ground and Signal Ground separated on PCB.
Table 2. Component Values for Typical Application
Figure 23. Typical Application
8-52V
C
C
C
C
C
C
C
C
1
2
A
B
BOOT
P
EN
REF
V
S
+
GROUND
-
DC
POWER
GROUND
SIGNAL
C
1
C
2
C
BOOT
D
1
100µF
100nF
220nF
5.6nF
10nF
68nF
R
R
1nF
1nF
SENSEA
SENSEB
D
2
M
R
A
P
and VS
C
SENSE
SENSE
P
VBOOT
OUT1
OUT2
OUT1
OUT2
GND
GND
GND
GND
VCP
VS
VS
B
A
B
A
B
A
A
B
B
) and ground near the L6228 to improve the high frequency
20
17
22
15
3
10
5
21
8
16
18
19
6
7
D
D
R
R
R
R
R
R
A
1
2
A
B
EN
P
SENSEA
SENSEB
and SENSE
B
D01IN1341
) should be connected to the sensing
24
11
23
14
13
12
1
2
4
9
VREF
VREF
RESET
EN
CONTROL
HALF/FULL
CLOCK
RC
CW/CCW
RC
A
B
A
B
R
C
EN
EN
C
R
C
R
A
A
B
B
C
REF
1N4148
1N4148
100K
39K
39K
100
0.6
0.6
V
RESET
ENABLE
FAST/SLOW DECAY
HALF/FULL
CLOCK
CW/CCW
REF
= 0-1V
L6228
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