Renesas M54640P Stepper motor driver Datasheet

M54640P
Stepper Motor Driver
REJ03F0042-0100Z
Rev.1.0
Sep.19.2003
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 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.
Pin Configuration
4
GND
5
Power supply VCC
Output current
value setting
Output current
direction switching
I1
M54640P
Output MB ← 1
One-shot-multi
T→ 2
time constant
Output power VMM
3
supply
16 → E
Current sensor
15 → MA
Output
14
13
GND
12
6
11 ← VR
7
10 ← C
Ph → 8
9
Outline 16P4
Rev.1.0, Sep.19.2003, page 1 of 9
power
VMM Output
supply
Io
Comparator
reference input
Comparator input
Output current
setting
M54640P
Block Diagram
Comparator reference input
VCC
VR
11
6
Output
MA
15
1
Output
MB
Schmitt trigger
Cutput current
Ph 8
direction switcing
1
1
1
>1
>1
3 VMM
14 Output power
supply
I1 7
Output current
value setting
I0 9
00
10
01
11
VKH
VKM
Monostable
tOFF = 0.69 • RT CT
VKL
4
GND
Current sensor
5
12
13
10
2
C
Comparator input
T
One-shot-multi time constant
1
6
E
Current sensor
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted.)
Parameter
Symbol
Ratings
Unit
Supply voltage
VCC
−0.3 to 7
V
Output supply voltage
Logic input voltage
VMM
VL
−0.3 to 45
−0.3 to 6
V
V
Analog input voltage
Comparative input voltage
VC
VR
−0.3 to Vcc
−0.3 to 15
V
V
Logic input current
Analog input current
IL
IC
−10
−10
mA
mA
Output supply current
Power dissipation
IMM
Pd
±1000
1.92
mA
W
Operating temperature
Storage temperature
Topr
Tstg
−20 to 75
−55 to 125
°C
°C
Conditions
Mounted on a board
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.
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.
Rev.1.0, Sep.19.2003, page 2 of 9
M54640P
Recommended Operating Condition
(Ta = 25°C, unless otherwise noted.)
Limits
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Output supply voltage
VCC
VMM
4.75
10
5
5.25
40
V
V
Output current
Logic input rise time
IO
tPLH
20
800
2
mA
µS
Logic input fall time
Thermal shutdown temperature
tPHL
TON
2
µS
°C
175
Electrical characteristics
(Ta = 25°C, VCC = 5.0V, unless otherwise noted.)
Limits
Parameter
Typ.
Max.
Unit
Test conditions
2.0
VCC
V
VCC=5V
0
400
430
0.8
450
mV
VCM
VCL
240
75
260
90
280
100
Comparator input current
Output cutoff current
ICO
IOFF
−20
Saturation voltage
Vsat
Cutoff time
tOFF
Turnoff delay
Supply current
td
ICC
Logic input voltage
Symbol
Min.
“H”
VIH
“L”
VIL
VCH
Comparator threshold
Logic input current
“H”
“L”
IIH
IIL
Rev.1.0, Sep.19.2003, page 3 of 9
25
VR=5V, I0=I1=0
VR=5V, I0=1,I1=0
VR=5V, I0=0, I1=1
20
100
µA
µA
4.0
V
30
35
µS
The voltage at the sensing resistor is
not included. IO=500mA
VMM=10V, tON ≥ 5µs
1.6
2.0
25
µS
mA
Ta=25°C, dVK/dt ≥ 50mV/µs
VCC=5V
20
−0.4
µA
mA
VI=2.4V
VI=0.4V
I0=I1=1(Ta=25°C)
M54640P
Switching Characteristics
Test Circuit
CT
1 MB
E 16
MA 15
2 T
VMM 14
3 VMM
RT
4
RS
CV
VCC
13
GND
GND
12
5
RC
VR 11
6 VCC
7 I1
C 10
8 Phase
I0
CC
9
RS :1Ω
RC : 1kΩ
RT : 56kΩ
CC : 820pF
CT : 820pF
CV : 47µF
Switching Waveforms
VMA – VMB or VMB – VMA
tOFF = 0.69RTCT
1
1/2
tON
tOFF
td
VCH
VCM
VCL
Rev.1.0, Sep.19.2003, page 4 of 9
M54640P
Application Description
• PHASE INPUT
Phase input decides the output mode.
Phase
MA
MB
H
H
L
L
L
H
• I0, I1
I0 and I1 fixed based on the comparison voltage VR decide the output current level.
The current level can be continuously changed by changing the voltage at VR continuously.
I0
I1
Current level
H
L
H
H
0
Low
H
L
L
L
Average
High
• Current sensor
When the voltage fall at the current sensing resistor and the selected current level becomes of the same level, the
comparator triggers the monostable. Then, the output stage is cut off for a certain time (tOFF). During this cutoff time,
the current volume decreases slightly and falls short of the comparison level.
After the cutoff time (tOFF), the output stage is in ON state again.
This operation is repeated.
• Single pulse generator
At the comparator output rise edge, the monostable is triggered.
The pulse width of the monostable at the external timing Rt and Ct is as follows.
tOFF = 0.69 x RtCt
Retrigger during tOFF is neglected.
•
Analog control
The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the
comparator.
Rev.1.0, Sep.19.2003, page 5 of 9
M54640P
Timing Chart
2-phase excitation
Phase A
Phase B
I0, 1 = (A) = 0
I0, 1 = (B) = 0
1-2-phase excitation
Phase A
Phase B
I0, 1 = (A)
I0, 1 = (B)
Microstep (divided into six)
Phase A
Phase B
I0 (A)
I1 (A)
I0 (B)
I1 (B)
Rev.1.0, Sep.19.2003, page 6 of 9
M54640P
Typical Characteristics (Absolute maximum ratings)
Safety operating temperature
1.0
A : Recommended
Output current Io (A)
0.8
B : Schottky diodes should be externally connected between
output pins and power supply pins.
B
0.6
C : Schottky diodes should be externally instaalled between
output pins and power supply pins and between output
pins and GND pin.
0.4
C
A
0.2
0
0
10
20
30
40 45
50
Output VMM (V)
Thermal derating
10.0
Allowable power dissipation (W)
θj-c = 10°C/W
A : Mounted on a 25cm2 glass epoxy board which is coated
with copper on one side.
θc-a = 45°C/W
B : 10cm2 aluminum heat sink (1t) is used.
θc-a = 25°C/W
C : 100cm2 aluminum heat sink (1t) is used.
θc-a = 10°C/W
Tj(max) = 150°C
8.0
6.0
C
4.0
B
A
2.0
0
0
25
50
Ambient (°C)
Rev.1.0, Sep.19.2003, page 7 of 9
75
100
M54640P
Application Example
1Ω
820pF
1kΩ
16 15 14 13 12
5V
11 10
9
6
8
M54640P
1
2
3
4
5
7
820pF
Phase A
56kΩ
I0A
I1A
1Ω
820pF
1kΩ
24V
47µF
16 15 14 13 12 11 10
9
Stepper motor
M54640P
1
2
3
820pF
4
5
6
7
8
Phase B
I0B
56kΩ
I1B
Precautions for use
(1) When the whole output current changes by a large margin (for example, when overheat protection 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 at the point near to IC pin between Vcc pin and
GND pin. (See above application example.)
(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.
Rev.1.0, Sep.19.2003, page 8 of 9
SEATING PLANE
EIAJ Package Code
DIP16-P-300-2.54
e
D
b
8
1
b2
Lead Material
Alloy 42/Cu Alloy
9
Weight(g)
1.0
16
JEDEC Code
—
b1
A
A1
A2
b
b1
b2
c
D
E
e
e1
L
Symbol
Plastic 16pin 300mil DIP
c
MMP
A
L
E
A2
A1
Rev.1.0, Sep.19.2003, page 9 of 9
Dimension in Millimeters
Min
Nom
Max
—
—
4.5
0.51
—
—
—
3.3
—
0.4
0.5
0.59
1.4
1.5
1.8
0.9
1.0
1.3
0.22
0.27
0.34
18.8
19.0
19.2
6.15
6.3
6.45
—
2.54
—
—
7.62
—
3.0
—
—
0˚
—
15˚
e1
16P4
M54640P
Package Dimensions
Sales Strategic Planning Div.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
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