2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation)
SMA7036M
sInternal
Block Diagram
1
6
5
8
14
10
15
IN A
IN B
Vs
1, 6, 10, 15pin
Description of pins
Reg.
Oscillator
MOSFET
gate drive
circuit
Synchronous
chopping
circuit
Reg.
Chopping
blanking timer
(5
µ
s typ)
+
−
Oscillator
MOSFET
gate drive
circuit
Synchronous
chopping
circuit
Chopping
blanking timer
(5
µ
s typ)
+
−
1pin
6pin
10pin
15pin
Excitation input
Active H
Active L
OUT A
OUT A
OUT A
OUT A
OUT B
OUT B
OUT B
OUT B
Chopping
OFF timer
(12
µ
s typ)
Chopping
OFF timer
(12
µ
s typ)
SYNC A
SYNC B
REF A
REF B
GND A
GND B
7
Rs A
2
4
3
13
12
11
9
sDiagram
of Standard External Circuit (Recommended Circuit Constants)
Vcc (46V max)
+
Excitation signal time chart
8
V
S
2
Sync
A
SMA7036M
Vb (5V)
11
PchMOS
r1
Rs
A
7
Rs
Ref
A
Ref
B
3
13
Rs
B
9
Rs
G
A
4
G
B
12
Sync
B
IN
B
14
IN
B
IN
A
5
IN
A
1
6
10
15
Rs B
2-phase excitation
clock
IN
A
IN
B
0
H
L
1
H
H
2
L
H
3
L
L
0
H
L
1
H
H
:
r
1
:
r
2
R
S
(1 to 2W) :
PchMOS :
Inv
:
8kΩ
2kΩ (VR)
1Ω typ
HN1J02FU (Toshiba)
7404
r2
Inv
Disable (High Active)
SMA7036M
13