Mitsubishi M54640P Datasheet
MITSUBISHI <CONTROL / DRIVER IC>
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M54640P
STEPPER MOTOR DRIVER
DESCRIPTION
The M54640P is a semiconductor IC to drive a stepper motor by
the bipolar method.
FEATURES
● Bipolar and constant-current drive
● Wide current control rage (20– 800mA)
● Wide supply voltage drive range (10 – 40V)
● Built in flywheel diodes
● Current level can be changed by steps or continuously.
● Built in a thermal shutdown circuit
APPLICATION
Printer, FDD, HDD, Fax
FUNCTION
The M54640P drives a stepper motor by the bipolar drive method to
change the current direction of a single coil and controls the current
direction with PHASE input pin. In order to obtain higher efficiency,
the constant current drive system to control the coil current is
introduced. The current value can be selected among four levels (0
to max.) by selecting the combination of three internal comparators
by logic input. It also can be continuously changed by controlling
the reference voltage. Conversion to voltage is conducted by the
current value sensing resistor (Rs) and the voltage is sensed with
PIN CONFIGURATION(TOP VIEW
Output
MB
ne-shot-multi
time constant
Output power
supply
Power supply
utput current
value setting
utput current
direction switching
V
MM
GND
V
Ph
←
1
T
2
→
3
4
CC
I1
→
M54640P
16
15
14
13
125
116
107
98
Outline 16P4
each comparator, and then each comparator output triggers
monomulti and the current is cut for a certain time (tOFF) by utilizing
the inductance of the coil.
Also, diodes needed for choppering and a thermal shutdown circuit
as a countermeasure against overvoltage are built in this circuit.
E
→
M
A
→
VMM
GND
VR
←
C
←
Io
Current sensor
Output
utput power
supply
omparator
reference input
Comparator input
utput current
setting
BLOCK DIAGRAM
Comparator reference input
Cutput current
direction switcing
Output current
value setting
Ph
I1
I0
GND
V
11
8
7
9
VKH
VKM
VKL
4
5
12
13
Comparator input
R VCC
6
Schmitt trigger
•
1
>1
RT CT
1
00 01
Current sensor
10 2 16
C
10
11
Monostable
OFF = 0.69
t
One-shot-multi time constant Current sensor
M
A MB
15
E
OutputOutput
1
3
VMM
14
1
>1
Output power
supply
MITSUBISHI <CONTROL / DRIVER IC>
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted)
M54640P
STEPPER MOTOR DRIVER
Symbol Ratings
VCC
VMM
VL
VC
VR
IL
IC
IMM
Pd
Topr
Tstg
Note. Every voltage value is measured when the voltage at GND pin is 0V. The maximum and the minimum of each voltage value are shown in absolute values.
Supply voltage
Output supply voltage
Logic input voltage
Analog input voltage
Comparative input voltage
Logic input current
Analog input current
Output supply current
Power dissipation
Operating temperature
Storage temperature
Regarding current directions, inflow current is shown in a positive value and outflow current is shown in a negative value. The maximum and the minimum
of each current value are shown in absolute values.
Parameter Conditions
Mounted on a board
-0.3 – 7
-0.3 – 45
-0.3 – 6
-0.3 – V
-0.3 – 15
-10
-10
±1000
1.92
-20 – 75
-55 – 125
CC
Unit
V
V
V
V
V
mA
mA
mA
W
°C
°C
RECOMMENDED OPERATING CONDITIONS (Ta=25°C, unless otherwise noted)
Symbol
VCC
VMM
IO
tPLH
tPHL
TON
Parameter
Supply voltage
Output supply voltage
Output current
Logic input rise time
Logic input fall time
Thermal shutdown temperature
Limits
Min. Typ. Max.
5
4.75
5.25
10
20
800
175
40
Unit
V
V
mA
µs
2
µs
2
°C
ELECTRICAL CHARACTERISTICS (VCC=5V, Ta=25°C, unless otherwise noted)
Symbol
VIH
VIL
VCH
VCM
VCL
ICO
IOFF
Vsat
tOFF
td
ICC
IIH
IIL
Logic input voltage
Comparator threshold
Comparator input current
Output cutoff current
Saturation voltage
Cutoff time
Turnoff delay
Supply current
Logic input current
“H”
V
“L”
CC=5V
VR=5V, I0=I1=0
V
R=5V, I0=1,I1=0
R=5V, I0=0, I1=1
V
I
0=I1=1(Ta=25°C)
The voltage at the sensing resistor is not
included. I
VMM=10V, tON≥5µs
Ta=25°C, dVK/dt≥50mV/µs
V
CC=5V
V
“H”
“L”
I=2.4V
V
I=0.4V
Test conditions UnitParameter
O=500mA
Min.
2.0
400
240
75
-20
25
Limits
Typ.
0
430
260
90
30
1.6
Max.
V
CC
0.8
450
280
100
20
100
4.0
35
2.0
25
20
-0.4
V
mV
µA
µA
V
µs
µs
mA
µA
mA
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