TB6608FNG
TOSHIBA Bi−CD Integrated Circuit Silicon Monolithic
TB6608FNG
Stepping Motor Driver IC
The TB6608FNG is a PWM constant-current type stepping
motor driver IC designed for sinusoidal-input micro-step control of
stepping motors.
The TB6608FNG can be used in applications that require
2-phase, 1-2-phase, W1-2-phase and 2W1-2 phase excitation
modes. The TB6608FNG is capable of forward and reverse driving
of a 2-phase bipolar stepping motor using only a clock signal.
Features
•
•
•
•
•
•
•
•
•
•
Motor power supply voltage: V
M
=
15 V (max)
Output current: Iout
≤
0.8 A (max)
Control power supply voltage: V
CC
=
2.7 to 6 V
Weight: 0.09 g (typ.)
Decoder that enables microstep control with the clock signal
Selectable phase excitation modes (2, 1-2, W1-2 and 2W1-2)
Internal pull-down resistors on inputs: 200 kΩ (typ.)
Output monitor pin (
MO
)
Output ON-resistance: Ron
=
1.5
Ω
(upper and lower sum@V
M
=
5 V)
Thermal shutdown (TSD) and undervoltage lockout (UVLO) circuits
Small surface-mount package (SSOP20: 0.65 mm lead pitch)
•
This product has a MOS structure and is sensitive to electrostatic discharge. When handling this product, ensure
that the environment is protected against electrostatic discharge by using an earth strap, a conductive mat and an
ionizer. Ensure also that the ambient temperature and relative humidity are maintained at reasonable levels.
Do not insert devices in the wrong orientation or incorrectly. Otherwise, it may cause the device breakdown,
damage and/or deterioration.
•
© 2014
TOSHIBA Corporation
1
2014-10-01
TB6608FNG
Block Diagram
GND
15
STBY
2
V
CC
1
MO
16
STANBY
UVLO
2V
M1
4
M2 5
CW/CCW
7
CK
20
RESET
14
ENABLE
19
DCY
18
Decoder for
microstep
control
2
1-2
W1-2
2W1-2
phase
PWM
timer
12 RFA
Pre-
driver
H-bridge
A
13 AO1
11 AO2
TSD
6
VM
B.G
Vref
2 switches
0.125
V,
0.5
V
Pre-
driver
PWM
timer
H-bridge
B
10 BO1
8 BO2
TQ 17
9 RFB
OSC
3
OSC
Vref Voltage Setting
Input
TQ
L
H
Vref
0.125
V
0.5
V
2
2014-10-01
TB6608FNG
Pin Function
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
V
CC
STBY
OSC
M1
M2
V
M
CW/CCW
BO2
RFB
BO1
AO2
RFA
AO1
RESET
GND
MO
Functional Description
Power supply pin for logic block
Standby input
Connection pin for an external capacitor
used for internal oscillation
Excitation mode setting input 1
Excitation mode setting input 2
Power supply pin for output
Rotation direction select input
B-phase
output 2
Connection pin for a
B-phase
output
current detection resistor
B-phase
output 1
A-phase
output 2
Connection pin for an
A-phase
output
current detection resistor
A-phase
output 1
Reset input
Ground
Monitor output
Vref setting input
Decay setting input
Enable input
Clock input
V
CC (opr)
=
2.7 to 5.5
V
Remarks
See the
Input Signals
and
Operating
Modes table.
See the Excitation Mode Settings table.
See the Excitation Mode Settings table.
V
M (opr)
=
2.5 to 13.5
V
See the Input Signals and Operating Modes table.
Connect
BO2
to a motor coil pin.
Connect
BO1
to a motor coil pin.
Connect
AO2
to a motor coil pin.
Connect
AO1
to a motor coil pin.
See the Input Signal and Operating Modes table.
Initial state:
MO
=
Low (open drain, pulled up by an
external resistor)
See the Vref Voltage Setting table.
See the Fast-Decay Time Inserted During the Current
Decay Period table.
See the Input Signal and Operating Modes table.
TQ
DCY
ENABLE
CK
Pin Assignment
V
CC
STBY
OSC
M1
M2
V
M
CW/CCW
BO2
RFB
BO1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CK
ENABLE
DCY
TQ
MO
GND
RESET
AO1
RFA
AO2
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TB6608FNG
Input Signals and Operation Modes
Inputs
CK
CW/CCW
L
H
X
X
X
X
X
X
RESET
H
H
L
X
X
ENABLE
H
H
H
L
X
STBY
H
H
H
H
L
CW
CCW
Initial mode
Enable Wait mode (Outputs: high impedance)
Standby mode (Outputs: high impedance)
Operating Mode
X: Don’t Care
Excitation Mode Settings
Inputs
M1
L
H
L
H
M2
L
L
H
H
Excitation Mode
2-phase
1-2-phase
W1-2-phase
2W1-2-phase
Initial A- and B-Phase Currents
Excitation Mode
2-phase
1-2-phase
W1-2-phase
2W1-2-phase
(This table also applies to the currents on exit from standby mode.)
A-Phase
Current
100%
100%
100%
100%
B-Phase
Current
−100%
0%
0%
0%
In this specification, the direction of current flows from AO1 to AO2 and from BO1 to BO2 are defined as the
forward direction.
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TB6608FNG
2-Phase Excitation (M1: L, M2: L, CW Mode)
CK
MO
2-Phase Excitation (M1: L, M2: L, CCW Mode)
CK
MO
(%)
100
I
A
0
−100
I
A
(%)
100
0
−100
(%)
100
I
B
0
−100
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
I
B
(%)
100
0
−100
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
1-2-Phase Excitation (M1: H, M2: L, CW Mode)
CK
MO
1-2-Phase Excitation (M1: H, M2: L, CCW Mode)
CK
MO
(%)
100
71
I
A
0
−71
−100
I
A
(%)
100
71
0
−71
−100
(%)
100
71
I
B
0
−71
−100
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
I
B
(%)
100
71
0
−71
−100
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
5
2014-10-01
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