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
q
Wide output current control range (20 1200mA)
q
Bipolar and constant current drive
q
Built in a thermal shutdown circuit
q
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
M5
4672S
P
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
Standby input(2)
P
h
2
Output current
direction switching(2)
V
bs
2
Bootstrap power
supply(2)
V
MM
2
Output power
supply(2)
M
A
2
Output(2)
M
B
2
Output(2)
V
MM
2
Output power
supply(2)
V
bs
2
Bootstrap power
supply(2)
24
GND
25
23
18
T2
One-shot-multi time constant(2)
26
E2
Current sensor(2)
19
Voltage sensor
Monostable
V
CC
2 Power
supply(2)
V
R
2
Comparator reference
input(2)
Standby circuit
comparator
1
3
16
4
5
6
11
12
13
2
C1
Comparator input(1)
S
t
1
Standby input(1)
P
h
1
Output current
direction switching(1)
V
bs
1
Bootstrap power
supply(1)
V
MM
1
Output power
supply(1)
M
A
1
Output(1)
M
B
1
Output(1)
V
MM
1
Output power
supply(1)
V
bs
1
Bootstrap power
supply(1)
9
GND
8
10
15
T1
One-shot-multi time constant(1)
7
E1
Current sensor(1)
14
Voltage sensor
Monostable
V
CC
1 Power
supply(1)
V
R
1
Comparator reference
input(1)
Standby circuit
comparator
2-PHASE STEPPER MOTOR DRIVER
M54672SP
MITSUBISHI <CONTROL / DRIVER IC>
V
CC
-0.3 6
Symbol
Limits
Min.
Typ.
Max.
Unit
Parameter
RECOMMENDED OPERATING CONDITIONS (Ta=25C, unless otherwise noted)
V
C
Limits
Min.
Typ.
Max.
Symbol
Test conditions
Unit
Parameter
ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise noted)
0
V
CC
mA
450
480
A
20
mA
1.5
V
10
15
V
100
V
1.6
25
mV
0.8
2.0
1.0
Symbol
Ratings
Unit
Parameter
Conditions
ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted)
Supply voltage
-0.3 7
-0.3 24
-0.3 27
-0.3 V
CC
-0.3 15
-10
-20 75
-55 125
V
V
V
W
C
C
I
IL
Output supply voltage
Bootstrap supply voltage
Logic input voltage
Analog input voltage
Comparative input voltage
Logic input current
Analog input current
Output supply current
Logic input voltage
Comparator threshold
Comparator input current
Output cutoff current
Saturation voltage
Logic input current
Cutoff time
Turn-off delay
Supply current
Voltage at sensing resistor is not included.
V
bs
=12.7V, V
MM
=12V, I
O
=800mA
A
A
s
s
2.0
420
-20
100
5
-0.4
V
MM
=12V, t
ON
5
s
V
R
=5V
dVK/dt
50mV/
s
V
CC
=5V
V
CC
=5V, 1phase
V
I
=2.4V
V
I
=0.4V
"H"
"L"
I
IH
I
CC
t
d
t
OFF
V
sat
I
OFF
I
CO
V
CH
V
IL
V
IH
"H"
"L"
V
CC
V
MM
V
bs
I
O
t
PLH
t
PHL
T
ON
Supply voltage
Output supply voltage
Bootstrap supply voltage
Output current
Logic input rise time
Logic input fall time
Thermal shutdown temperature
V
V
mA
s
s
5.5
20
24
1200
2
2
5
160
12
800
4.5
10
V
bs
V
MM
+1V
20
V
MM
V
bs
V
L
V
C
V
R
I
L
I
C
I
MM
P
d
T
opr
T
stg
Allowable loss
Operating temperature
Storage temperature
mA
mA
mA
V
V
V
1.70
-10
1500
2-PHASE STEPPER MOTOR DRIVER
M54672SP
MITSUBISHI <CONTROL / DRIVER IC>
TYPICAL CHARACTERISTICS
SWITCHING CHARACTERISTICS
APPLICATION DESCRIPTION
(1) PHASE INPUT
Phase input decides the output mode.
(2) V
R
(Comparative voltage)
The current level can be continuously changed by changing the
voltage at V
R
continuously.
(3) Current sensor
When the voltage fall at the current sensing resistor and the
selected current level become of the same level, the
comparator triggers the monostable. Then the output stage is
cut off for a certain time (T
OFF
). During this cutoff time, the
current volume decreases slightly and falls short of the
comparative level.
After the cutoff time (T
OFF
), the output stage is in ON state
again. This operation is repeated.
(4) Single pulse generator
At the comparator output rise edge, the monostable is
triggered. The pulse width of the monostable at the external
timing C
T
and R
T
is as follows.
T
OFF
= 0.69 x C
T
x R
T
Retrigger during T
OFF
is neglected.
(5) Analog control
The output current level can be continuously changed by
changing the voltage at V
R
or the feedback voltage to the
comparator.
PHASE
H
L
M
A
H
L
M
B
L
H
TIMING CHART
Switching waveforms
V
MA
-V
MB
or V
MB
-V
MA
T
OFF
= 0.69 x R
T
x C
T
1
1/2
T
ON
T
OFF
V
CH
V
E
t
d
2-phase excitation
Phase 1
Phase 2
1
50
Allowable power
dissipation
(W)
60
70
80
40
30
20
10
0
2.5W
1.7W
Ambient Temperature T
a
(
C)
2
3
j-c
= 25
C/W
Free air
(
c-a
= 48.5
C/W)
10cm
2
aluminum heat sink
(
c-a
= 25
C/W)
Thermal
2-PHASE STEPPER MOTOR DRIVER
M54672SP
MITSUBISHI <CONTROL / DRIVER IC>
APPLICATION EXAMPLE (Stepping motor driver)
1
S
t
1
2
C1
3
V
R
1
4
V
bs
1
5
V
MM
1
6
7
8
9
GND
10
11
12
V
MM
1
13
V
bs
1
14
V
CC
1
15
T1
16
P
h
1
32
S
t
2
31
C2
30
V
R
2
29
V
bs
2
28
V
MM
2
27
26
25
GND
24
23
22
21
V
MM
2
20
V
bs
2
19
V
CC
2
18
T2
17
P
h
2
C
T1
M
B
1
B
2
M5
4672S
P
R
S1,
R
S2
= 0.5
R
C1,
R
C2
= 1k
C
C1,
C
C2
= 820pF
R
T1,
R
T2
= 47k
C
T1,
C
T2
= 330pF
Stepper motor
(3.7mH / 6
/ phase)
R
T1
Phase 1
R
S1
C
C1
R
C1
M
A
1
E1
M
A
2
E2
C
T2
R
T2
Phase 2
R
S2
C
C2
R
C2
V
BS
13V
V
MM
12V
47
F
V
CC
5V
M
2-PHASE STEPPER MOTOR DRIVER
M54672SP
MITSUBISHI <CONTROL / DRIVER IC>
PRECAUTIONS FOR USE
(1) Before use, never forget to short-circuit V
CC
1 and V
CC
2.
(2) When the whole output current changes by a large margin (for
example, when thermal shutdown operation causes intermittent
flow of output current), the supply voltage may undergo a
change. Therefore, selection and wiring of power supply should
be conducted cautiously to avoid such a situation that the
supply voltage exceeds the absolute maximum ratings.
(3) When the supply voltage changes by a large margin, the
operation of this IC may become unstable. In this case, the
change of supply voltage can be controlled by connecting a
capacitor between Vcc pin and GND pin.
(4) Thermal shutdown function
The state of thermal shutdown operation may differ according
to the way of wiring within a board. Therefore, sufficient board
evaluation should be conducted before use. When the board is
changed, operation on the replacing board should be
evaluated.
The circuit board on which this IC is mounted is designed to
realize low impedance between power supply and output pin.
Therefore, it is desirable to take a safe measure such as fixing
a fuse to avoid such a situation that the board is damaged by a
fire when output pin is internally short-circuited by excessively
applied surge voltage by accident.
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