tb62201afg TOSHIBA Semiconductor CORPORATION, tb62201afg Datasheet - Page 4

• Manufacturer Part Number: tb62201afg
• Description: Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

3. Current Feedback Circuit and Current Setting Circuit
Note 1: RS COMP 1: Compares the set current with the output current and outputs a signal when the output current
Note 2: RS COMP 2: Compares the set current with the output current at the end of Fast mode during chopping.
V
ref
V
R
Function
M
S
(A/B unit (C/D unit is the same as A/B unit))
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
The chopping waveform generator circuit to which CR is connected is used to generate clock used as
reference for the chopping frequency.
Current setting circuit
Current feedback circuit
TORQUE
0, 1
TORQUE
control
100%
circuit
85%
70%
50%
reaches the set current.
Outputs a signal when the set current is below the output current.
V
V
R
V
difference
difference
RS
RS
M
potential
between
S
potential
between
(detects
(detects
and V
and R
circuit 1
circuit 2
Logic
unit
M
S
)
)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CURRENT
0 to 3
Micro-step
circuit
M
selector
current
4-bit
setting
D/A
circuit
.
R
R
(Note 1)
(Note 2)
circuit 1
circuit 2
S
S
COMP
COMP
4
Chopping reference circuit
Output stop signal (ALL OFF)
Waveform shaping circuit
Use in Charge mode
Use in Fast mode
reached signal)
monitor signal)
(set current
(set current
RNF
NF
TB62201AFG
CR
2005-04-04
Output
control
Mixed
decay
timing
circuit
circuit