2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation)
SMA7036M
sInternal Block Diagram
16
5
8
14
10 15
Reg.
Oscillator
Chopping
blanking timer
(5 µ s typ)
MOSFET
gate drive
Chopping
OFF timer
+
circuit
(12 µ s typ)
−
Synchronous
chopping
circuit
Reg.
Chopping
blanking timer
(5 µ s typ)
Oscillator
MOSFET
+
Chopping
OFF timer
gate drive
−
(12 µ s typ)
circuit
Synchronous
chopping
circuit
1, 6, 10, 15pin
Description of pins
Excitation input
Active H Active L
1pin OUT A OUT A
6pin OUT A OUT A
10pin OUT B OUT B
15pin OUT B OUT B
7
2
4
3 13
12
11
9
sDiagram of Standard External Circuit (Recommended Circuit Constants)
Vcc (46V max)
+
Vb (5V)
PchMOS
r1
r2
8
VS
2 SyncA
11 SyncB
1
6
10 15
SMA7036M
INA 5
INB 14
RsA RefA RefB RsB GA
GB
7
3 13
9
4
12
Rs
Rs
Excitation signal time chart
2-phase excitation
clock 0
1
2
3
0
1
INA H
H
L
L
H
H
INA
INB L
H
H
L
L
H
r1
: 8kΩ
r2
: 2kΩ (VR)
INB RS (1 to 2W) : 1Ω typ
PchMOS : HN1J02FU (Toshiba)
Inv
: 7404
Inv
Disable (High Active)
SMA7036M 13