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)
Control power supply voltage: V
CC
=
2.7 to 6 V
Output current: Iout
≤
0.8 A (max)
Output ON-resistance: Ron
=
1.5
Ω
(upper and lower sum@V
M
=
5 V)
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
)
Thermal shutdown (TSD) and undervoltage lockout (UVLO) circuits
Small surface-mount package (SSOP20: 0.65 mm lead pitch)
Weight: 0.09 g (typ.)
•
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.
•
About solderability, following conditions were confirmed
•
Solderability
(1) Use of Sn-37Pb solder Bath
· solder bath temperature
=
230°C
· dipping time
=
5 seconds
· the number of times
=
once
· use of R-type flux
(2) Use of Sn-3.0Ag-0.5Cu solder Bath
· solder bath temperature
=
245°C
· dipping time
=
5 seconds
· the number of times
=
once
· use of R-type flux
1
2007-12-17
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
H-bridge
B
10 BO1
8 BO2
TQ 17
PWM
timer
9 RFB
OSC 3
OSC
Vref Voltage Setting
Input
TQ
L
H
Vref
0.125 V
0.5 V
2
2007-12-17
TB6608FNG
Pin Function
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
V
CC
STBY
OSC
M1
M2
V
M
CW/CCW
BO2
RFB
BO1
AO2
RFA
AO1
RESET
GND
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
Connect AO1 to a motor coil pin.
See the Input Signal and Operating Modes table.
Connect BO1 to a motor coil pin.
Connect AO2 to a motor coil pin.
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.
V
CC (opr)
=
2.7 to 5.5 V
See the Input Signals and Operating Modes table.
Remarks
MO
TQ
DCY
ENABLE
CK
Monitor output
Vref setting input
Decay setting input
Enable input
Clock input
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.
17
18
19
20
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
3
2007-12-17
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.
4
2007-12-17
TB6608FNG
2-Phase Excitation (M1: L, M2: L, CW Mode)
CK
MO
(%)
100
2-Phase Excitation (M1: L, M2: L, CCW Mode)
CK
MO
(%)
100
I
A
0
I
A
0
−
100
−
100
(%)
100
(%)
100
I
B
0
I
B
0
−
100
−
100
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
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
(%)
100
71
I
A
0
−
71
−
100
1-2-Phase Excitation (M1: H, M2: L, CCW Mode)
CK
MO
(%)
100
71
I
A
0
−
71
−
100
(%)
100
71
I
B
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
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
5
2007-12-17
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