TB62209FG
TOSHIBA BiCD Processor IC Silicon Monolithic
Stepping Motor Driver IC Using PWM Chopper Type
TB62209FG
The TB62209FG is a stepping motor driver driven by chopper
micro-step pseudo sine wave.
The TB62209FG integrates a decoder for CLK input in micro
steps as a system to facilitate driving a two-phase stepping motor
using micro-step pseudo sine waves. Micro-step pseudo sine
waves are optimal for driving stepping motors with low-torque
ripples and at low oscillation. Thus, the TB62209FG can easily
drive stepping motors with low-torque ripples and at high
efficiency.
Also, TB62209FG consists of output steps by DMOS (Power
Weight: 0.79 g (typ.)
MOS FET), and that makes it possible to control the output
power dissipation much lower than ordinary IC with bipolar
transistor output.
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
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Bipolar stepping motor can be controlled by a single driver IC
Monolithic BiCD IC
Built-in decoder and 4-bit DA converters for micro steps
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: 1.8 A/phase max
2-phase, 1-2 (type 2) phase, W1-2 phase, 2W1-2 phase, 4W1-2 phase, or motor lock mode can be
selected.
Built-in Mixed Decay mode enables specification of four-stage attenuation ratio.
Chopping frequency can be set by external resistors and capacitors.
High-speed chopping possible at 100 kHz or higher.
Low ON-resistance of R
on
=
0.5
Ω
(T
j
=
25°C @1.0 A: typ.)
Built-in ISD, TSD, V
DD
&V
M
power monitor (reset) circuit for protection
Note: When using the IC, pay attention to thermal conditions.
This device is easily damaged by high static voltage, please handle with care.
This product is RoHS compatible.
© 2014 TOSHIBA Corporation
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2014-10-01
TB62209FG
3. Current feedback circuit and current setting circuit
Function
The current setting circuit is used to set the reference voltage of the output current using the current
setting decoder.
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 R
S
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
Decoder
Unit
CURRENT
0-3
V
ref
100%
85%
70%
50%
Torque
control
circuit
Current setting
circuit
D/A circuit
15 Micro-step
14
current
setting
13
12 selector
circuit
11
10
9
8
7
6
5
4
3
4-bit
2
D/A
1
circuit
0
Chopping waveform
generator circuit
CR
Waveform shaping circuit
Chopping reference circuit
Mixed
Decay
timing
circuit
Output stop signal (ALL OFF)
R
S
V
RS
circuit 1
(detects
potential
difference
between
R
S
and V
M
)
<Use
in Charge mode>
R
S COMP
circuit
1
(Note 1)
NF
(set current
reached signal)
Output
control
circuit
V
M
V
RS
circuit 2
(detects
potential
difference
between
V
M
and R
S
)
Current feedback circuit
R
S COMP
circuit
2
(Note 2)
RNF
(set current
monitor signal)
<Use
in FAST MODE>
Note 1: R
S COMP1
: Compares the set current with the output current and outputs a signal when the output
current reaches the set current.
Note 2: R
S COMP2
: 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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TB62209FG
4. Output control circuit, current feedback circuit and current setting circuit
Micro-step current setting
decoder circuit
Chopping
reference circuit
Mixed
Decay
timing
circuit
Output control circuit
PHASE
DECAY
MODE
Current
feedback
circuit
NF set current
reached signal
RNF set current
monitor signal
Output stop
signal
Mixed
Decay
timing
Charge Start
U1
U2
L1
Output control circuit
L2
CR counter
CR Selector
Current
setting
circuit
Output circuit
Output RESET signal
V
DD
V
M
Power supply for
upper drive output
STANDBY
Output pin
ISD
circuit
Internal
stop
signal
select
circuit
V
M
V
MR
circuit
Charge
pump
halt
signal
V
H
Output
circuit
Charge
pump
circuit
Cop A
V
DD
V
DDR
circuit
Cop B
TSD
circuit
V
DDR
: V
DD
power on
Reset
V
MR
: V
M
power on Reset
ISD: Current shutdown
circuit
TSD: Thermal shutdown
circuit
Protection
circuit
Micro-step current
setup latch
clear signal
Cop C
Charge pump
circuit
LOGIC
Mixed Decay
timing table clear
signal
Note: The STANDBY pins are pulled down in the IC by 100-kΩ resistor.
When not using the pin, connect it to GND. Otherwise, malfunction may occur.
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2014-10-01
嵌入式系统
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