2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
32
29
30
31
28
27
24
23
22
21
20
19
26
25
18
17
1
4
3
2
5
6
9
10
11
12
13
14
7
8
15
16
DESCRIPTION
The M54670P is a semiconductor IC to drive a bipolar stepper
motor directly by controlling the coil current with the constant
current method.
FEATURES
q
Wide operating voltage range (10 – 35V)
q
Wide output current control range (20 – 800mA)
q
Bipolar and constant current drive
q
Built in flywheel
q
Current level can be changed by steps or continuously.
q
Built in a thermal shutdown circuit
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
FUNCTION
The M54670P 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 3 and 30).
The coil current value can be selected among four levels (0 to
max.) by selecting the combination of three internal comparators by
logic input (pins 14, 15, 18 and 19). It also can be continuously
controlled with V
R
pins (pins 2 and 31). By selecting an I input pin
among pins 14, 15, 18 or 19, the operation timing, 2-phase
excitation, 1-2-phase excitation or microstep, can be selected.
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
2
32
3
4
5
12
13
29
28
21
20
30
31
17
C(B)
22
E(B)
11
E(A)
1
CT
16
C(A)
14
15
10
00
10
01
11
11
01
10
00
6
GND
Comparator input(A)
Triangular wave
Current sensor(A)
Current sensor(B)
Comparator input(B)
Power supply sensor
Triangular
wave
GND
23
Output current value
I0(A)
I1(A)
19
18
setting(B)
I0(B)
Control circuit
Control circuit
TSD
Power supply sensor
V
R
(A)
Comparator
reference input(A)
V
CC
Circuit power supply
P
h
(A)
Output current
direction switching(A)
V
MM
1(A)
Output power
supply(A)
O
2(A)
Output(A)
V
MM
2(A)
Output power
supply(A)
V
MM
1(B)
Output power
supply(B)
O
1(B)
Output(B)
O
2(B)
Output(B)
V
MM
2(B)
Output power
supply(B)
V
R
(B)
Comparator input(B)
P
h
(B)
Output current
direction switching(B)
setting(A)
Output current value
setting(A)
Output current value
setting(B)
I1(B)
Output current value
O
1(A)
Output(A)
Outline 32P4B
CT
V
R
(A)
Ph(A)
V
MM
1(A)
O1(A)
GND
E(A)
O2(A)
V
MM
2(A)
I0(A)
I1(A)
C(A)
V
CC
V
R
(B)
Ph(B)
V
MM
1(B)
O1(B)
GND
E(B)
O2(B)
V
MM
2(B)
I0(B)
I1(B)
C(B)
Triangular wave
Comparator
reference input(A)
Output current
direction switching(A)
Output power
supply(A)
Output(A)
Current sensor(A)
Output(A)
Output power
supply(A)
Output current
value setting(A)
Output current
value setting(A)
Comparator
input(A)
Circuit power supply
Comparator
reference input(B)
Output current
direction switching(B)
Output power
supply(B)
Output(B)
Current sensor(B)
Output(B)
Output power
supply(B)
Output current
value setting(B)
Output current
value setting(B)
Comparator
input(B)
M5
4670P
PIN CONFIGURATION (TOP VIEW)
–
27
–
2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
ABSOLUTE MAXIMUM RATINGS (Ta=25
°
C, unless otherwise noted)
Symbol
Ratings
Unit
Parameter
Conditions
V
CC
Supply voltage
Mounted on a board
-0.3 – 7
-0.3 – 40
-0.3 – 6
V
CC
7
±
1.0
1.92
-20 – 75
-55 – 125
V
V
V
V
V
A
W
°
C
°
C
RECOMMENDED OPERATING CONDITIONS (V
CC
=5.0V, Ta=25
°
C, unless otherwise noted)
Symbol
Parameter
Limits
Min.
Typ.
Max.
Unit
V
CC
Supply voltage
Output supply voltage
Output current
Logic input rise time
Logic input fall time
Thermal shutdown temperature *
4.75
10
0
5.00
5.25
35
5
800
2.0
V
V
µ
s
ELECTRICAL CHARACTERISTICS (V
CC
=5.0V, V
MM
=10V, Ta=25
°
C, unless otherwise noted)
Limits
Min.
Typ.
Max.
Symbol
Test conditions
Unit
Parameter
V
IH
V
IL
V
CH
V
CM
V
CL
I
CO
I
OFF
V
sat
Logic input voltage
Comparator threshold
Comparator input current
Output cutoff current
Saturation voltage
“H”
“L”
V
CC
=5V
V
R
=5V, I
0
=I
1
=0
V
R
=5V, I
0
=1, I
1
=0
V
R
=5V, I
0
=0, I
1
=1
I
0
=I
1
=1(Ta=25
°
C)
2.0
0
430
265
90
-20
460
285
110
V
CC
0.8
480
305
130
20
100
mV
µ
A
µ
A
µ
A
Reference input voltage
* : Refer to "PRECAUTIONS FOR USE."
20
175
2.0
°
C
µ
s
mA
V
mV
V
V
—
—
—
—
—
—
-2
0
V
MM
V
R
I
O
t
PLH
t
PHL
T
ON
V
MM
V
I
V
C
V
R
I
O
P
d
T
opr
T
stg
Output supply voltage
Logic circuit input voltage
Comparator input voltage
Reference input voltage
Output current
Allowable power dissipation
Operating temperature
Storage temperature
mV
—
Voltage at sensing resistor is not included.
I
0
=500mA
I
IL
I
IH
I
CC
t
d
f
c
Logic input current
Supply current
Turn-off delay
PWM oscillator frequency
“L”
“H”
V
I
=0.4V
V
I
=2.4V
V
CC
=5V
Ta=25
°
C, dV/dt
≥
50mV/
µ
s
V
MM
=10V, C
f
=3900pF
—
16.5
20
180
8.0
1.0
33
50
400
25
2.0
66
µ
A
mA
µ
s
kHz
—
3.0
4.5
V
2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
I
0
H
L
H
L
I
1
H
Current level
H
L
L
0
Low
Typ
High
(2) I
0
, I
1
I
0
and I
1
fixed based on the comparative voltage V
R
decide the
output current level.
PHASE
H
L
O1
L
O2
H
H
L
(3) V
R
(Comparative voltage)
The current level can be continuously changed by changing the
voltage at V
R
continuously.
(4) Current sensor
When the voltage fall at the current sensing resistor and the
selected current level become of the same level, the output
state is cut off for a certain time by inverting the comparator.
During this cutoff time, the current volume decreases slightly
due to the L component of the motor and falls short of the
comparative level. During the time fixed based on the PWM
frequency, the output stage goes in ON state and then in OFF
state and this ON/OFF operation is repeated.
(5) PWM oscillator
A capacitor C
f
is externally connected to C
T
pin in order to fix
the PWM oscillator frequency. The frequency f
c
is calculated as
follows.
(6) Analog control
The output current level can be continuously changed by
changing the voltage at V
R
or the feedback voltage to the
comparator.
(7) Thermal shutdown function
This IC has a function to protect itself against thermal damage
which is caused when the chip temperature rises abnormally.
Regarding this function, refer to “PRECAUTIONS FOR USE.”
f
c
=
7.77 x 10
3
x C
f
1
TIMING CHART
2-phase excitation
Phase 1
Phase 2
I0, 1(A) = 0
I0, 1(B) = 0
1-2-phase excitation
Phase 1
Phase 2
I0, 1(A)
I0, 1(B)
Microstep
Phase 1
Phase 2
I0(A)
I1(A)
I0(B)
I1(B)
APPLICATION DESCRIPTION
(1) PHASE INPUT
Phase input decides the output mode.
2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
TYPICAL CHARACTERISTICS (ABSOLUTE MAXIMUM RATINGS)
1.0
0.6
Output current IO
(A)
0
10
50
Output V
MM
(V)
20
30
40
0.2
0.4
0.8
35
0
A :
B :
C :
Recommended
Schottky diodes should be externally
connected between output pin and power supply pin.
Schottky diodes should be externally connected between output pin
and power supply pin and between output pin and GND pin.
Safety operating range
2.0
Allowable power
dissipation
(W)
0
80
Ambient (
°
C)
1.0
3.0
0
A : Free air
(
θ
c-a
= 50
°
C/W)
B : With 10cm
2
aluminum heat
(
θ
c-a
= 25
°
C/W)
C : With 100cm
2
aluminum heat
(
θ
c-a
= 10
°
C/W)
Thermal derating
10
20
30
40
50
60
70
4.0
A
B
C
θ
j-c
= 20
°
C/W
T
j(max)
= 150
°
C
B
A
C
2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
APPLICATION EXAMPLE (Stepping motor driver)
1
C
T
2
V
R
(A)
3
P
h
(A)
4
V
MM
1(A)
5
O1(A)
6
7
8
9
GND
10
11
12
O2(A)
13
V
MM
2(A)
14
I0(A)
15
I1(A)
16
C(A)
32
V
CC
31
V
R
(B)
30
P
h
(B)
29
V
MM
1(B)
28
O1(B)
27
26
25
GND
24
23
22
21
O2(B)
20
V
MM
2(B)
19
I0(B)
18
I1(B)
17
C(B)
C
C
R
C
R
S
R
C
Phase A
Phase B
V
MM
V
CC
V
R
IN(B)
40
µ
F/50V
C
C
IN(A)
E(A)
E(B)
R
S
C
f
M5
4670P
0.01
µ
F
C
f
= 3900pF
R
S
= 0.51
Ω
R
C
= 1k
Ω
C
C
= 820pF
Stepper motor
(3.7mH / 6
Ω
/ phase)
2-PHASE STEPPER MOTOR DRIVER
M54670P
MITSUBISHI <CONTROL / DRIVER IC>
PRECAUTIONS FOR USE
(1) 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.
(2) 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.
(3) 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.