TB62202AF
TOSHIBA Bi−CMOS Processor IC Silicon Monolithic
TB62202AF
Dual-Stepping Motor Driver IC for OA Equipment Using PWM Chopper Type
The TB62202AF is a dual-stepping motor driver driven by
chopper micro-step pseudo sine wave.
To drive two-phase stepping motors, Two pairs of 16-bit latch and
shift registers are built in the IC. The IC is optimal for driving
stepping motors at high efficiency and with low-torque ripple.
The IC supports Mixed Decay mode for switching the attenuation
ratio at chopping. The switching time for the attenuation ratio
can be switched in four stages according to the load.
Features
Two stepping motors driven by micro−step pseudo sine wave
are controlled by a single driver IC
Monolithic Bi-CMOS IC
Low ON-resistance of Ron = 1.2
Ω
(T
j
= 25°C @1.0 A: Typ.)
Two pairs of built-in 16-bit shift and latch registers
Two pairs of built-in 4-bit DA converters for micro steps
Built-in ISD, TSD, V
DD
and V
M
power monitor (reset) circuit for protection
Built-in charge pump circuit (two external capacitors)
36-pin power flat package (HSOP36-P-450-0.65)
Output voltage: 40 V max
Output current: 1.0 A/phase max
Built-in Mixed Decay mode enables specification of four-stage attenuation ratio.
(The attenuation ratio table can be overwritten externally.)
Chopping frequency can be set by external resistors and capacitors. High-speed chopping possible at 100 kHz or
higher.
Note:
When using the IC, pay attention to thermal conditions.
These devices are easy damage by high static voltage.
In regards to this, please handle with care.
Weight: 0.79 g (typ.)
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TB62202AF
Block Diagram
1. Overview (Power lines: A/B unit (C/D unit is the same as A/B unit))
RESET
Logic circuit
Current control data logic circuit
DATA
CLK
STROBE
Current setting
V
ref
4-bit DA
(analog control)
Waveform
chapping
circuit
16-bit shift register
16-bit latch
Chopping
reference circuit
Chopping
waveform
generator
circuit
CR
Torque control
Current feedback circuit
R
S
V
RS
circuit
R
S COMP
circuit
Output control circuit
V
M
Ccp 2
Charge pump
circuit
Ccp 1
Output circuit
(H-bridge)
ISD
circuit
TSD
circuit
V
M
V
DDR
/V
MR
circuit
V
DD
Protected circuit
Out X
Stepping
motor
High voltage wiring (V
M
)
Logic DATA
Analog DATA
IC terminal
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TB62202AF
2. Logic unit A/B (C/D unit is the same as A/B unit)
Function
This circuit is used to input from the DATA pins micro−step current setting data and to transfer them to the
subsequent stage. By switching the SETUP pin, the data in the mixed decay timing table can be overwritten.
SETUP
Micro-step current setting data logic circuit
16-bit shift register
MIXED
DECAY
TIMING
Output control
circuit
DATA
CLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STROBE
16-bit latch
Data input
selector
A unit side
TORQUE
×
2 bits
DECAY
×
2 bits
B unit side
CURRENT
×
4 bits
B unit side
PHASE
×
1 bit
B
RESET
Current feedback circuit
D/A circuit
Output control circuit
Note: The
RESET
and SETUP pins are pulled down in the IC by 10-kΩ resistor.
When not using these pins, connect them to GND. Otherwise, malfunction may occur.
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TB62202AF
3. Current feedback circuit and current setting circuit
(A/B unit (C/D unit is the same as A/B unit)
Function
The current setting circuit is used to set the reference voltage of the output current using the micro−step
current setting data input from the DATA pins.
The current feedback circuit is used to output to the output control circuit the relation between the set
current value and output current. This is done by comparing the reference voltage output to the current
setting circuit with the potential difference generated when current flows through the current sense resistor
connected between RS and V
M
.
The chopping waveform generator circuit to which CR is connected is used to generate clock used as
reference for the chopping frequency.
TORQUE
0, 1
LOGIC
UNIT
CURRENT
0~3
100%
85%
70%
50%
Torque
Control
circuit
Current setting circuit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Micro-step current setting
selector circuit
V
ref
Chopping waveform
generator circuit
CR
Waveform shaping circuit
4-bit
D/A
circuit
Chopping reference circuit
Mixed decay
timing circuit
Output stop signal (ALL OFF)
Use in Charge mode
V
RS
circuit 1
(detects
potential
difference
between
R
S
and V
M
)
V
RS
circuit 2
(detects
potential
difference
between
V
M
and R
S
)
R
S
COMP
circuit 1
(Note 1)
Output
control circuit
R
S
NF
(set current reached signal)
V
M
R
S
COMP
circuit 2
(Note 2)
RNF
(set current monitor signal)
Use in Fast mode
Current feedback circuit
Note 1: RS COMP 1: Compares the set current with the output current and outputs a signal when the output current
reaches the set current.
Note 2: RS COMP 2: Compares the set current with the output current at the end of Fast mode during chopping.
Outputs a signal when the set current is below the output current.
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TB62202AF
4. Output control circuit, current feedback circuit and current setting circuit
(A/B unit
(C/D unit is the same as A/B unit)
Micro-step current setting
data logic circuit
DECAY
MODE
Chopping
reference circuit
MIXED
DECAY
TIMING
circuit
CR
COUNTER
MIXED
DECAY
TIMING
Charge start
Current
setting
circuit
Output stop
signal
Output control circuit
U
1
U
2
L
1
L
2
Output circuit
Output control circuit
NF
set current
reached signal
RNF
set current
monitor signal
PHASE
Current
feedback
circuit
CR COUNTER
Output RESET signal
V
DD
V
M
Power supply
for upper
output MOS
transistors
RESET
Output pin
ISD (current
shutdown)
circuit
V
MR
circuit
Reset signal
selector
circuit
Charge
pump
halt
signal
Charge pump
circuit
V
H
Output
circuit
V
M
Ccp A
V
DD
V
DDR
circuit
Thermal
shut down
(TSD)
circuit
Protection circuit
MICRO-STEP
CURRENT SETUP
LATCH CLEAR signal
Charge pump
circuit
MIXED DECAY
TIMING TABLE
CLEAR signal
LOGIC
Ccp B
Ccp C
V
DDR
: V
DD
power on Reset
V
MR
: V
M
power on Reset
ISD:
Current shutdown circuit
TSD: Thermal shutdown circuit
Note:
The
RESET
pins is pulled down in the IC by 10-kΩ resistor.
When not using the pin, connect it to GND. Otherwise, malfunction may occur.
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