L6235 STMicroelectronics, L6235 Datasheet - Page 18

• Manufacturer Part Number: L6235
• Description: DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR
• Manufacturer: STMicroelectronics

L6235
APPLICATION INFORMATION
A typical application using L6235 is shown in Figure 21. Typical component values for the application are shown
in Table 3. A high quality ceramic capacitor (C
power pins VS
and reduce high frequency transients generated by the switching. The capacitor (C
input to ground sets the shut down time when an over current is detected (see Overcurrent Protection). The two
current sensing inputs (SENSE
length as short as possible in the layout. The sense resistor should be non-inductive resistor to minimize the di/
dt transients across the resistor. To increase noise immunity, unused logic pins are best connected to 5V (High
Logic Level) or GND (Low Logic Level) (see pin description). It is recommended to keep Power Ground and
Signal Ground separated on PCB.
Table 3. Component Values for Typical Application.
Figure 21. Typical Application
18/25
8-52V
V
S
+
GROUND
-
POWER
DC
GROUND
SIGNAL
+5V
C
C
C
C
C
C
BOOT
REF1
REF2
C
C
C
C
D
D
OFF
PUL
EN
C
P
R
R
R
1
2
3
1
2
1
A
H1
H2
H3
and VS
C
THREE-PHASE MOTOR
2
SENSOR
HALL
B
and ground near the L6235 to improve the high frequency filtering on the power supply
C
BOOT
D
R
1
SENSE
A
M
and SENSE
D
2
R
P
1N4148
1N4148
100µF
100nF
220nF
220nF
100nF
5.6nF
10nF
33nF
10nF
1nF
SENSE
SENSE
VBOOT
C
OUT
OUT
OUT
P
GND
VCP
VS
VS
H
H
H
A
B
A
B
1
2
3
1
2
3
B
) should be connected to the sensing resistor R
2
20
17
22
15
3
10
5
21
16
1
23
24
18
19
6
7
) in the range of 100nF to 200nF should be placed between the
D02IN1357
R
13
12
11
14
H1
2
8
4
9
R
, R
R
R
SENSE
R
R
VREF
DIAG
EN
FWD/REV
BRAKE
TACHO
RCOFF
RCPULSE
R
R
R
R
R
OFF
PUL
DD
EN
H2
C
P
1
2
3
4
REF1
, R
H3
C
R
C
R
C
OFF
OFF
PUL
PUL
EN
R
EN
R
2
EN
R
1
) connected from the EN
ENABLE
FWD/REV
BRAKE
C
R
3
4
SENSE
+
-
100K
5K6
1K8
4K7
33K
47K
10K
100
1M
0.3
5V
1K
R
R
DD
with a trace
3
C
REF2
V
REF