stk672-050-e ON Semiconductor, stk672-050-e Datasheet - Page 10

• 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

• M1, M2, and M3 (Excitation mode and CLK input edge timing selection)
• M4 and M5 (Microstepping mode rotation vector locus setting)
See page 10 for details on the current division ratio.
• RESET (Resets all parts of the system.)
• Vref (Sets the current level used as the reference for constant-current detection.)
M3
1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure
1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure
2) Function:
3) Notes: When power is first applied to this hybrid IC, Vref must be established by applying a reset. Applications
1) Pin circuit type: Analog input structure
2) Function:
2) Function:
3) Valid mode setting timing: Applications must not change the mode in the period 5μs before or after a CLK signal
1
0
Mode
M2
M1
- Constant-current control can be applied to the motor excitation current at 100% of the rated current by applying a
- Applications can apply constant-current control proportional to the Vref voltage, with this value of 2.5V as the
M4
M5
Hybrid IC internal setting state
- All circuit states are set to their initial values by setting the RESET pin low. (Note that the pulse width must be
voltage less than the control system power supply voltage V CC 2 minus 2.5V.
upper limit.
at least 10μs.)
At this time, the A and B phases are set to their origin, regardless of the excitation mode. The output current
goes to about 71% after the reset is released.
1-2 phase excitation
2 phase excitation
must apply a power on reset when the V CC 2 power supply is first applied.
Phase excitation clock
Mode switching clock
Circular
0
0
1
1
System clock
Mode setting
CLK input
W1-2 phase excitation
1
0
0
1-2 phase excitation
rising or falling edge.
0
1
2
Mode Setting Acquisition Timing
1
0
STK672-050-E
2W1-2 phase excitation
W1-2 phase excitation
M1 to M3
3
0
1
1
0
Mode switching timing
Phase B
2W1-2 phase excitation
4W1-2 phase excitation
Excitation counter up/down
Circular
1
1
3
1
Phase switching clock edge timing
Phase A
Rising and falling edges
Rising edge only
2
A06851
ITF02399
No.5228-10/19