tb62202afg TOSHIBA Semiconductor CORPORATION, tb62202afg Datasheet - Page 4

• Manufacturer Part Number: tb62202afg
• 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
The current setting circuit is used to set the reference voltage of the output current using the microïstep
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.
M
S
(A/B unit (C/D unit is the same as A/B unit)
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
M
)
)
.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CURRENT
0~3
circuit
4-bit
D/A
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
(set current reached signal)
(set current monitor signal)
Chopping waveform
generator circuit
Use in Charge mode
Use in Fast mode
RNF
NF
TB62202AFG
control circuit
CR
Mixed decay
timing circuit
2005-04-04
Output