TB62218AFG/AFTG
TOSHIBA BiCD Integrated Circuit
Silicon Monolithic
TB62218AFG, TB62218AFTG
BiCD Constant-Current Two-Phase Bipolar Stepping Motor Driver IC
The TB62218AFG/AFTG is a two-phase bipolar stepping motor
driver using a PWM chopper.
Fabricated with the BiCD process, the TB62218AFG/AFTG is
rated at 40 V/2.0 A.
The on-chip voltage regulator allows control of a stepping motor
with a single V
M
power supply.
TB62218AFG
Features
•
•
•
•
•
•
•
Bipolar stepping motor driver
PWM constant-current drive
Allows two-phase, 1-2-phase and W1-2 phase excitations.
BiCD process: Uses DMOS FETs as output power transistors.
High voltage and current: 40 V/2.0 A (absolute maximum
ratings)
Thermal shutdown (TSD), overcurrent shutdown (ISD), and
power-on resets (PORs)
Packages: HSOP28-P-0450-0.8
QFN48-P-0707-0.50
HSOP28-P-450-0.80
TB62218AFTG
QFN48-P-0707-0.50
Weight
HSOP28-P-0450-0.80: 0.79 g (typ.)
QFN48-P-0707-0.50: 0.14 g (typ.)
1
2012-03-12
TB62218AFG/AFTG
Pin Assignment
TB62218AFG
(HSOP28)
IN_A1
IN_A2
PHASE_A
PHASE_B
IN_B1
IN_B2
STANDBY
1
2
3
4
5
6
7
28
27
26
25
24
23
22
OSCM
Vref_A
Vref_B
NC
NC
Vcc
V
M
FIN(GND)
FIN(GND)
RS_A
NC
OUT_A
NC
GND
OUT_A
GND
8
9
10
11
12
13
14
21
20
19
18
17
16
15
RS_B
NC
OUT_B
NC
GND
OUT_B
GND
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2012-03-12
TB62218AFG/AFTG
Pin Assignment
TB62218AFTG
(
QFN48
)
OUT_B1
OUT_B2
RS_B1
V
CC
RS_B2
NC
NC
NC
NC
NC
*
NC 37
NC 38
NC 39
GND 40
V
ref_B
41
V
ref_A
42
OSCM 43
IN_A1 44
IN_A2 45
PHASE_A 46
PHASE_B 47
NC 48
NC
V
M
36
35
34
33
32
31
30
29
28
27
26
25
*
24 NC
23 NC
22 GND
21
OUT_B1
20 OUT_B2
19 GND
18 GND
17 OUT_A2
16 OUT_A1
15 GND
14 NC
13 NC
1
NC
2
IN_B1
3
IN_B2
4
STANDBY
5
GND
6
NC
7
RS_A1
8
RS_A2
9
NC
10
OUT_A1
11
OUT_A2
12
NC
*
*
*Mark PAD: It must be connected to GND
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2012-03-12
TB62218AFG/AFTG
Block Diagram
In the block diagram, part of the functional blocks or constants may be omitted or simplified for explanatory
purposes.
STANDBY
PHASE_A
IN_A1
IN_A2
PHASE_B
IN_B1
IN_B2
Chopper OSC
Input Logic
VM
VMR
Detect
Vcc Voltage
Regulator
Vcc
OSCM
OSC
Vref
Current Level Set
CR-CLK
Converter
V
M
Current Feedback (×2)
V
RS
R
S
COMP
Output Control
(Mixed Decay Control)
RS
ISD
STANDBY
TSD
Output
(H-Bridge×2)
VM
VMR
Detect
Detection Circuit
Stepping
Motor
Note: All the grounding wires of the TB62218AFG/AFTG must run on the solder mask on the PCB and be externally
terminated at only one point. Also, a grounding method should be considered for efficient heat dissipation.
Careful attention should be paid to the layout of the output, V
DD
(V
M
) and GND traces, to avoid short-circuits
across output pins or to the power supply or ground. If such a short-circuit occurs, the TB62218AFG/AFTG may be
permanently damaged.
Also, utmost care should be taken for pattern designing and implementation of the TB62218AFG/AFTG since it has
the power supply pins (V
M
, RS
_
A, RS_B, OUT_A,
OUT_A
, OUT_B,
OUT_B
, GND) particularly a large current can
run through. If these pins are wired incorrectly, an operation error or even worse a destruction of the
TB62218AFG/AFTG may occur.
The logic input pins must be correctly wired, too; otherwise, the TB62218AFG/AFTG may be damaged due to a
current larger than the specified current running through the IC.
Please note the avbove when designing and implementing IC patterns.
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2012-03-12
TB62218AFG/AFTG
Pin Function
TB62218AFG
(HSOP28)
Pin No.
1
2
3
4
5
6
7
Pin Name
IN_A1
IN_A2
PHASE_A
PHASE_B
IN_B1
IN_B2
A-phase excitation control input
A-phase excitation control input
Current direction signal input for A phase
Current direction signal input for B phase
B-phase excitation control input
B-phase excitation control input
Function
STAND BY
RS_A
NC
OUT_A
NC
GND
OUT_A
Output; Wait for power saving by disabling OSCM
The sink current sensing of A-phase motor coil
No-connect
A-phase positive driver output
No-connect
Motor power ground
A-phase negative driver output
Motor power ground
Motor power ground
B-phase negative driver output
Motor power ground
No-connect
B-phase positive driver output
No-connect
The sink current sensing of B-phase motor coil
Power supply
Smoothing filter for logic power supply
No-connect
No-connect
Tunes the current level for B-phase motor drive.
Tunes the current level for A-phase motor drive.
Oscillator pin for PWM choppers
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
GND
GND
OUT_B
GND
NC
OUT_B
NC
RS_B
V
M
V
CC
NC
NC
V
ref_B
V
ref_A
OSCM
Pin Interfaces
(HSOP28)
150Ω
1
2
4
6
3
5
7
FIN
100kΩ
22
8kΩ
3kΩ
3kΩ
10
19
13
16
8 21
12
17
23
26
27
1kΩ
28
500Ω
1kΩ
14
15
FIN
FIN
The equivalent circuit diagrams may be simplified or some parts of them may be omitted fo
explanatory purposes. Absolute precision of the chip internal resistance is +/-30%.
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2012-03-12
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