stk672-050-e ON Semiconductor, stk672-050-e Datasheet - Page 6

• Manufacturer Part Number: stk672-050-e
• Description: Thick-film Hybrid Ic Unipolar Constant-current Chopper External Excitation Pwm Circuit With Built-in Microstepping Controller Stepping Motor Driver Sine Wave Drive Output Current 3.0a No Heat Sink*
• Manufacturer: ON Semiconductor

Power-on Reset
The application must perform a power-on reset operation when V CC 2 power is first applied to this hybrid IC.
Application circuit that used 2W1-2 phase excitation (microstepping operation) mode.
Setting the Motor Current
The motor current I OH is set by the Vref voltage on the hybrid IC pin 8. The following formula gives the relationship
between I OH and Vref.
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, I OH = 3.0A
Function Table
M3
CWB
MO1
MO2
1
0
I OH =
M2
M1
1-2 phase excitation
2 phase excitation
1
3
V CC 2=5V
Forward
× Vref/Rs, Rs: The hybrid IC internal current detection resistor (0.2Ω ±3%)
A
0
0
0
1
0
0A
+
1kΩ
RESET
CLK
W1-2 phase excitation
ENABLE
1-2 phase excitation
MO1
MO2
RET
MOI
Reverse
A
0
1
0
0
1
Motor current waveform
STK672-050-E
10
11
12
14
13
15
14
18
16
17
19
20
21
9
2W1-2 phase excitation
W1-2 phase excitation
STK672-050-E
V CC 2=5V
22
7
1
0
B
0
1
6
5
2
1
3
4
8
A
A
B
B
V CC 2=5V
2W1-2 phase excitation
4W1-2 phase excitation
stepping motor
ENABLE
RESET
Vref
Two-phase
B
1
1
1
1
V CC 1=10V to 45V
Ioave
Motor current is cut off when low
I OL
Phase switching clock edge timing
+
I OH
Rising and falling edges
ITF02395
Active low
Rising edge only
SG
PG
A12408
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