EVAL6208N Datasheet, PDF (19/27 Pages) STMicroelectronics – DMOS DRIVER FOR BIPOLAR STEPPER MOTOR

L6208
APPLICATION INFORMATION
A typical Bipolar Stepper Motor Driver application using L6208 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_A and VS_B) and ground near the L6208 to improve the high frequency
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_A and SENSE_B) should be connected to the sensing
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
C₁
100µF
D₁
C₂
100nF
D₂
C_A
1nF
R_A
C_B
1nF
R_B
C_BOOT
220nF
R_EN
C_P
10nF
R_P
C_EN
5.6nF
R_SENSEA
C_REF
68nF
R_SENSEB
Figure 23. Typical Application
+
V_S
8-52V_DC
C₁
C₂
POWER
GROUND
-
SIGNAL
GROUND
VS_{A 20}
VS_{B 17}
D₁
R_P
C_BOOT
D₂
R_SENSEA
R_SENSEB
C_{P VCP}
22
VBOOT
15
SENSE_{A 3}
SENSE_{B 10}
OUT1_{A 5}
OUT2_{A 21}
M
OUT1_{B 8}
OUT2_{B 16}
18
GND
19
GND
6
GND
7
GND
1N4148
1N4148
39KΩ
39KΩ
100KΩ
100Ω
0.3Ω
0.3Ω
24 ^VREFA
11 ^VREFB
V_REF = 0-1V
C_REF
RESET
23
RESET
EN ^REN
14
ENABLE
C_EN
CONTROL
13
HALF/FULL
12
CLOCK
1
CW/CCW
2
C_A
4 ^RCA
R_A
C_B
9 ^RCB
D01IN1341
R_B
FAST/SLOW DECAY
HALF/FULL
CLOCK
CW/CCW
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