TB62218AFNG
TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB62218AFNG
BiCD Constant-Current Two-Phase Bipolar Stepping Motor Driver IC
The TB62218AFNG is a two-phase bipolar stepping motor driver
using a PWM chopper.
Fabricated with the BiCD process, the TB62218AFNG 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.
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)
Packages: HTSSOP48-P-300-0.50
HTSSOP48-P-300-0.50
Weight: 0.21 g (typ.)
Thermal shutdown (TSD), overcurrent shutdown (ISD), and power-on resets (PORS)
© 2014 TOSHIBA Corporation
1
2014-10-01
TB62218AFNG
Pin Assignment
TB62218AFNG
(Top View)
OSCM
NC
IN_A1
IN_A2
PHASE_A
NC
PHASE_B
IN_B1
IN_B2
STANDBY
GND
NC
RS_A1
RS_A2
NC
OUT_A1
OUT_A2
NC
NC
GND
NC
OUT _ A
1
OUT _ A
2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VREF_A
VREF_B
GND
NC
NC
NC
NC
VCC
NC
V
M
NC
NC
RS_B1
RS_B2
NC
OUT_B1
OUT_B2
NC
NC
GND
NC
OUT _ B
1
OUT _ B
2
GND
TB62218AFNG
2
2014-10-01
TB62218AFNG
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
Input Logic
VMR
Detect
VM
Vcc Voltage
Regulator
Chopper OSC
OSC
V
CC
OSCM
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 TB62218AFNG 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 TB62218AFNG may be
permanently damaged.
Also, utmost care should be taken for pattern designing and implementation of the TB62218AFNG 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 TB62218AFNG may
occur.
The logic input pins must be correctly wired, too; otherwise, the TB62218AFNG 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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2014-10-01
TB62218AFNG
Pin Function
Pin
Pin Name
No.
1
2
3
4
5
6
7
8
9
OSCM
NC
IN_A1
IN_A2
PHASE_A
NC
PHASE_B
IN_B1
IN_B2
No-connect
A-phase excitation control input
A-phase excitation control input
Current direction signal input for A phase
No-connect
Current direction signal input for B phase
B-phase excitation control input
B-phase excitation control input
High: Normal operation mode
Low: Standby mode
Logic ground
No-connect
Power supply pin of A-phase motor coil and
the sink current sensing of A-phase motor coil
No-connect
A-phase positive driver output
No-connect
No-connect
Motor power ground
No-connect
A-phase negative driver output
Function
Oscillator pin for PWM choppers
Pin
No.
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Pin Name
GND
Function
Motor power ground
B-phase negative driver output
No-connect
Motor power ground
No-connect
No-connect
B-phase positive driver output
No-connect
Power supply pin of B-phase motor coil and
the sink current sensing of B-phase motor coil
No-connect
No-connect
Power supply
No-connect
Smoothing filter for logic power supply
No-connect
No-connect
No-connect
No-connect
Logic ground
Tunes the current level for B-phase motor
drive.
Tunes the current level for A-phase motor
drive.
OUT_B2
OUT_B1
NC
GND
NC
NC
OUT_B2
OUT_B1
NC
RS_B2
RS_B1
NC
NC
V
M
NC
VCC
NC
NC
NC
NC
GND
VREF_B
VREF_A
10
STAND BY
11
12
13
14
15
16
17
18
19
20
21
22
23
24
GND
NC
RS_A1
RS_A2
NC
OUT_A1
OUT_A2
NC
NC
GND
NC
OUT_A1
OUT_A2
GND
Motor power ground
Pin Interfaces
(HTSSOP48)
3
5
8
4
7
9
10
150
Ω
39
100½
Ω
11
46
8k
Ω
14 35
33 27
3k
Ω
3k
Ω
13
36
16 22
17 23
32 26
20
29
41
47
48
11
46
1k
Ω
1
1k
Ω
500
Ω
11
46
24
25
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes.
Absolute precision of the chip internal resistance is +/-30%.
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2014-10-01
TB62218AFNG
Output Function Table
Input signal
PHASE_A
PHASE_B
H
IN_A1
IN_B1
H
H
L
L
H
H
L
L
IN_A2
IN_B2
H
L
H
L
H
L
H
L
OUT_X
H
H
H
Outputs disabled
L
L
L
Outputs disabled
Output
OUT _ X
IOUT
100%
71%
38%
0%
-100%
-71%
-38%
0%
L
L
L
L
Outputs disabled
H
H
H
Outputs disabled
IOUT: The current which flows OUT_X to
OUT _ X
is defined plus current. The current which flows
OUT _ X
to OUT_X
is defined as minus current.
Input signals to IN_X and PHASE_X after the voltage range of the motor being used is attained.
(*X: A1, A2, B1. B2)
Other Functions
Pin Name
STAND BY
H
Normal operation
mode
L
Standby mode
Notes
When
STAND BY
is Low, both the oscillator and output drivers
are disabled. The TB62218AFNG can not drive a motor.
Detection Features
(1)
Thermal shutdown (TSD)
The thermal shutdown circuit turns off all the outputs when the junction temperature (T
j
) exceeds 150°C
(typ.). The outputs retain the current states.
The TB62218AFNG exits TSD mode and resume normal operation when the TB62218AFNG is rebooted or
the
STAND BY
pin is changed from High to Low and then to High.
Power-ON-resets (PORS) for VMR and VCCR (V
M
and VCC voltage monitor)
The outputs are forced off until V
M
and VCC reach the rated voltages.
Overcurrent shutdown (ISD)
Each phase has an overcurrent shutdown circuit, which turns off the corresponding outputs when the output
current exceeds the shutdown trip threshold (above the maximum current rating: 2.0A minimum).
The TB62218AFNG exits ISD mode and resume normal operation when the
STAND BY
pin is changed
from High to Low and then to High.
This circuit provides protection against a short-circuit by temporarily disabling the device. Important notes
on this feature will be provided later.
(2)
(3)
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2014-10-01
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