tb62209f TOSHIBA Semiconductor CORPORATION, tb62209f Datasheet - Page 4

• Manufacturer Part Number: tb62209f
• Description: Stepping Motor Driver Ic Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

V
3. Current feedback circuit and current setting circuit
V
R
ref
M
S
Function
Note 1: R
Note 2: R
setting decoder.
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
reference for the chopping frequency.
The current setting circuit is used to set the reference voltage of the output current using the current
The current feedback circuit is used to output to the output control circuit the relation between the
The chopping waveform generator circuit to which CR is connected is used to generate clock used as
Current feedback circuit
TORQUE
0, 1
S COMP1
S COMP2
Current setting
Torque
control
100 ¸
circuit
85 ¸
70 ¸
50 ¸
DA circuit
circuit
V
V
R
V
difference
difference
RS
RS
M
potential
between
S
potential
between
(detects
(detects
: Compares the set current with the output current and outputs a signal when the output
: Compares the set current with the output current at the end of Fast mode during chopping.
and V
and R
current reaches the set current.
Outputs a signal when the set current is below the output current.
Decoder
circuit 1
circuit 2
Unit
M
S
)
)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CURRENT
Micro-step
selector
circuit
current
setting
0-3
circuit
4-bit
DA
S
R
R
and V
(Note 1)
(Note 2)
S COMP
S COMP
circuit
circuit
1
2
M
4
.
Chopping reference circuit
Output stop signal (ALL OFF)
Waveform shaping circuit
Chopping waveform
generator circuit
<Use in Charge mode>
<Use in FAST MODE>
reached signal)
monitor signal)
(set current
(set current
RNF
NF
CR
TB62209F
Output
control
Decay
Mixed
timing
circuit
circuit
2001-09-05