SKT672-040-E Datasheet, PDF (6/19 Pages) ON Semiconductor – Stepping Motor Driver

STK672-040-E
Power-on Reset
The application must perform a power-on reset operation when VCC2 power is first applied to this hybrid IC.
Application circuit that used 2W1-2 phase excitation (microstepping operation) mode.
VCC2=5V
CLK
ENABLE
1kΩ
+ _RESET
RET
MoI
Mo1
Mo2
VCC2=5V
VCC1=10V to 45V
7
9
10
11
12
143
Two-phase
stepping motor
6A
5A
2B
1B
15
14 ^STK672-040-E ₃
18
4
16
17
VCC2=5V
19
20
21
8
Vref
22
+
SG
PG
ITF02371
Setting the Motor Current
The motor current IOH is set by the Vref voltage on the hybrid IC pin 8. The following formula gives the relationship
between IOH and Vref.
IOH =
1
3
× Vref/Rs, Rs: The hybrid IC internal current detection resistor (0.33Ω ±3%)
Applications can use motor currents from the current (0.05 to 0.1A) set by the duty of the frequency set by the oscillator
up to the limit of the allowable operating range, IOH = 1.5A
0A
Function Table
M2
0
M1
0
M3
1
2 phase excitation
0
1-2 phase excitation
Motor current waveform
Ioave
IOL IOH
A12395
0
1
1
Phase switching clock edge timing
1
0
1
1-2 phase excitation
W1-2 phase excitation
W1-2 phase excitation 2W1-2 phase excitation
2W1-2 phase excitation 4W1-2 phase excitation
Rising edge only
Rising and falling edges
CWB
Forward
0
Reverse
1
ENABLE
RESET
Motor current is cut off when low
Active low
A
A
B
B
MO1
1
0
0
1
MO2
0
0
1
1
No. 5227-6/19