
2-PHASE STEPPER MOTOR DRIVER
M54672SP
MITSUBISHI <CONTROL / DRIVER IC>
DESCRIPTION
The M54672SP is a semiconductor IC to drive a stepper motor
directly by controlling the coil current with the constant current
method.
FEATURES
G
Wide output current control range (20 – 1200mA)
G
Bipolar and constant current drive
G
Built in a thermal shutdown circuit
G
Built in flywheel diodes
APPLICATION
Office automation equipment such as printer, FDD, HDD and FAX
FUNCTION
The M54672SP can drive a stepper motor by the 2-phase bipolar
method and also control the coil current. Furthermore, it controls
the direction of the coil current with Ph input pins (pins 16 and 17)
and the coil current value with V
R
pins (pins 3 and 30).
Because two control circuits are built in this IC, a stepper motor
can be driven with a single IC by the 2-phase bipolar method.
BLOCK DIAGRAM
PIN CONFIGURATION (TOP VIEW)
32
29
30
31
1
4
3
2
28
5
27
6
24
9
23
10
22
11
21
12
13
14
20
19
7
8
26
25
15
18
16
17
M
Outline 32P4B
S
t
1
C1
V
R
1
V
bs
1
V
MM
1
Ph1
M
A
1
E1
V
bs
1
V
MM
1
M
B
1
GND
Vcc1
T1
S
t
2
C2
V
R
2
V
bs
2
V
MM
2
Ph2
M
A
2
E2
V
bs
2
V
MM
2
M
B
2
GND
Vcc2
T2
Standby input (1)
Comparator input (1)
Comparator
reference input (1)
Bootstrap power
supply (1)
Output power
supply (1)
Output (1)
Current sensor (1)
Power supply (1)
One-shot-multi time
constan
t
(1)
Output current direction
switching (1)
Bootstrap power
supply (1)
Standby input (2)
Comparator input (2)
Comparator reference
input (2)
Bootstrap power
supply (2)
Output power
supply (2)
Output (2)
Current sensor (2)
Power supply (2)
One-shot-multi time
constant (2)
Output current direction
switching (2)
Output (2)
Output power supply (2)
Bootstrap power
supply (2)
Output power supply (1)
Output (1)
32
30
17
29
28
27
22
21
20
31
C2
Comparator input(2)
S
t
2
S
P
h
2
O
d
V
b
2
B
V
M
2
O
M
A
2
O
M
B
2
O
V
M
2
O
V
b
2
B
24
GND
25
23
18
T2
One-shot-multi time constant(2)
26
E2
Current sensor(2)
19
Voltage sensor
Monostable
V
C
2
V
R
2
C
Standby circuit
comparator
1
3
16
4
5
6
11
12
13
2
C1
Comparator input(1)
S
t
1
S
P
h
1
O
d
V
b
1
B
V
M
1
O
M
A
1
O
M
B
1
O
V
M
1
O
V
b
1
B
9
GND
8
10
15
T1
One-shot-multi time constant(1)
7
E1
Current sensor(1)
14
Voltage sensor
Monostable
V
C
1
V
R
1
C
Standby circuit
comparator