MITSUBISHI M54670P

MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
PIN CONFIGURATION (TOP VIEW)
The M54670P is a semiconductor IC to drive a bipolar stepper
motor directly by controlling the coil current with the constant
current method.
Triangular wave
CT 1
FEATURES
Comparator
reference input(B)
Output current
30 Ph(B) direction switching(B)
Output power
29 VMM1(B) supply(B)
31 VR(B)
O1(A) 5
Output(A)
28 O1(B) Output(B)
6
27
7
26
M54670P
● Wide operating voltage range (10 – 35V)
● Wide output current control range (20 – 800mA)
● Bipolar and constant current drive
● Built in flywheel
● Current level can be changed by steps or continuously.
● Built in a thermal shutdown circuit
8
GND
APPLICATION
9
Office automation equipment such as printer, FDD, HDD, and FAX
Current sensor(A)
E(A) 11
Output(A)
O2(A) 12
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 VR 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.
Output power
supply(A) VMM2(A)
Output current
I0(A)
value setting(A)
Output current
I1(A)
value setting(A)
Comparator
C(A)
input(A)
23
Current sensor(B)
21 O2(B)
Output(B)
Output power
13
20 VMM2(B) supply(B)
14
19 I0(B)
15
18 I1(B)
16
17 C(B)
VMM1(A)
Output power supply(A)
O1(A)
Output(A)
O2(A)
Output(A)
VMM2(A)
Output power supply(A)
VMM1(B)
Output power supply(B)
O1(B)
Output(B)
O2(B)
Output(B)
VMM2(B)
Output power supply(B)
Ph(B)
Output current
direction switching(B)
VR(B)
Comparator input(B)
4
5
12
13
29
28
21
20
30
31
Control circuit
Ph(A)
Output current
direction switching(A)
3
Control circuit
VCC Circuit power supply
32
Output current value
setting(B)
19 I0(B)
18 Output current value
TSD
00
10
01
11
11
01
10
setting(B)
I1(B)
00
23
–
–
10
Output current
value setting(B)
Output current
value setting(B)
Comparator
input(B)
Outline 32P4B
6
GND
22 E(B)
2
Output current value
setting(A)
I0(A) 14
Output current value 15
setting(A)
I1(A)
GND
24
VR(A)
Comparator
reference input(A)
BLOCK DIAGRAM
25
10
FUNCTION
Circuit power supply
32 VCC
Comparator
reference input(A) VR(A) 2
Output current
direction switching(A) Ph(A) 3
Output power
supply(A) VMM1(A) 4
Power supply sensor
16
C(A)
Comparator input(A)
Triangular
wave
1
CT
Triangular wave
Power supply sensor
11
E(A)
22
E(B)
Current sensor(B)
Current sensor(A)
GND
27
17
C(B)
Comparator input(B)
MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted)
Symbol
VCC
VMM
VI
VC
VR
IO
Pd
Topr
Tstg
Parameter
Conditions
Supply voltage
Output supply voltage
Logic circuit input voltage
Comparator input voltage
Reference input voltage
Output current
Allowable power dissipation
Operating temperature
Storage temperature
Mounted on a board
Ratings
Unit
-0.3 – 7
-0.3 – 40
-0.3 – 6
VCC
7
±1.0
1.92
-20 – 75
-55 – 125
V
V
V
V
V
A
W
°C
°C
RECOMMENDED OPERATING CONDITIONS (VCC=5.0V, Ta=25°C, unless otherwise noted)
Symbol
VCC
VMM
VR
IO
tPLH
tPHL
TON
Parameter
Min.
4.75
10
0
20
Supply voltage
Output supply voltage
Reference input voltage
Output current
Logic input rise time
Logic input fall time
Thermal shutdown temperature *
Limits
Typ.
5.00
—
Max.
5.25
35
5
800
2.0
2.0
175
Unit
V
V
V
mA
µs
µs
°C
* : Refer to "PRECAUTIONS FOR USE."
ELECTRICAL CHARACTERISTICS (VCC=5.0V, VMM=10V, Ta=25°C, unless otherwise noted)
Symbol
VIH
VIL
VCH
VCM
VCL
ICO
IOFF
Vsat
fc
td
ICC
IIH
IIL
Parameter
Logic input voltage
Test conditions
“H”
“L”
VR=5V, I0=I1=0
VR=5V, I0=1, I1=0
VR=5V, I0=0, I1=1
I0=I1=1(Ta=25°C)
Comparator threshold
Comparator input current
Output cutoff current
Saturation voltage
Voltage at sensing resistor is not included.
I0=500mA
PWM oscillator frequency
Turn-off delay
Supply current
Logic input current
VCC=5V
“H”
“L”
VMM=10V, Cf=3900pF
Ta=25°C, dV/dt≥50mV/µs
VCC=5V
VI=2.4V
VI=0.4V
Min.
Limits
Typ.
Unit
—
460
285
110
-2
0
Max.
VCC
0.8
480
305
130
20
100
—
3.0
4.5
V
16.5
33
1.0
8.0
180
20
66
2.0
25
400
50
kHz
µs
mA
µA
µA
2.0
0
430
265
90
-20
—
—
—
—
—
—
V
V
mV
mV
mV
µA
µA
MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
APPLICATION DESCRIPTION
(1) PHASE INPUT
TIMING CHART
2-phase excitation
Phase input decides the output mode.
PHASE
O1
O2
H
L
H
L
H
L
Phase 1
Phase 2
I0, 1(A) = 0
I0, 1(B) = 0
(2) I0, I1
I0 and I1 fixed based on the comparative voltage VR decide the
1-2-phase excitation
output current level.
Phase 1
Phase 2
I0
I1
Current level
H
H
0
L
H
Low
H
L
Typ
L
L
High
I0, 1(A)
I0, 1(B)
Microstep
Phase 1
Phase 2
I0(A)
(3) VR (Comparative voltage)
I1(A)
The current level can be continuously changed by changing the
I0(B)
voltage at VR continuously.
I1(B)
(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 Cf is externally connected to CT pin in order to fix
the PWM oscillator frequency. The frequency fc is calculated as
follows.
fc =
1
7.77 x 103 x Cf
(6) Analog control
The output current level can be continuously changed by
changing the voltage at VR 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.”
MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
TYPICAL CHARACTERISTICS (ABSOLUTE MAXIMUM RATINGS)
Safety operating range
1.0
A : Recommended
Output current IO (A)
0.8
B : Schottky diodes should be externally
connected between output pin and power supply pin.
B
0.6
C : Schottky diodes should be externally connected between output pin
and power supply pin and between output pin and GND pin.
0.4
A
0.2
0
10
0
C
20
30
50
35 40
Output VMM (V)
Thermal derating
θj-c = 20°C/W
C
Allowable power dissipation (W)
4.0
A : Free air
(θc-a = 50°C/W)
B : With 10cm2 aluminum heat
(θc-a = 25°C/W)
3.0
B
C : With 100cm2 aluminum heat
(θc-a = 10°C/W)
2.0
A
Tj(max) = 150°C
1.0
0
0
10
20
30
40
50
Ambient (°C)
60
70
80
MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
APPLICATION EXAMPLE (Stepping motor driver)
VR
1
CT
VCC
32
2
VR(A)
VR(B)
31
3
Ph(A)
Ph(B)
30
4
VMM1(A)
VMM1(B)
29
5
O1(A)
O1(B)
28
VCC
Cf
Phase A
6
27
7
26
GND
9
M54670P
8
GND
25
23
E(A)
E(B)
22
RS
RS
RC
IN(A)
VMM
40µF/50V
0.01
µF
24
10
11
Phase B
12
O2(A)
O2(B)
21
13
VMM2(A)
VMM2(B)
20
14
I0(A)
I0(B)
19
15
I1(A)
I1(B)
18
RC
IN(B)
CC
CC
16
C(A)
C(B)
17
Cf = 3900pF
RS = 0.51Ω
RC = 1kΩ
CC = 820pF
Stepper motor
(3.7mH / 6Ω / phase)
MITSUBISHI <CONTROL / DRIVER IC>
M54670P
2-PHASE STEPPER MOTOR DRIVER
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.