onsemi STK672-080-SL-E

The STK672-060-E is a stepper motor driver hybrid IC featuring a power MOSFET output stage. It incorporates a built-in microstepping controller based on a unipolar constant-current PWM system. This product supports application simplification and standardization by providing an integrated 4-phase distribution stepper motor controller. It supports five excitation methods — 2-phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase — enabling control of the stepper motor's basic step angle in 1/16-step increments, with motor speed controllable via clock signal alone. Using this hybrid IC, designers can achieve systems delivering high motor torque, low vibration, low noise, fast response, and high-efficiency drive.

• Simple stepper motor drive system implementation requiring only a DC power supply and clock pulse generator.
• Five drive types selectable via drive mode settings (M1, M2, and M3): 2-phase excitation, 1-2 phase excitation, W1-2 phase excitation, 2W1-2 phase excitation, and 4W1-2 phase excitation.
• Four freely selectable modes for vector trajectory during microstepping drive: circular mode, one internal mode, and two external modes.
• Phase retention maintained even when switching excitation.
• Real-time excitation phase status verification via MO1, MO2, and MOI signal output pins.
• CLK input counter block selectable via high/low setting of M3 input pin: rising edge only, or rising and falling edges.
• CLK and RETURN input pins include built-in fault prevention circuitry for external pulse noise.
• ENABLE and RESET pins provided as Schmitt trigger inputs with built-in 20kΩ (typical) pull-up resistors.
• No noise from differences in A-phase and B-phase time constants during motor hold, due to external excitation.
• Microstepping operation supported even at low motor currents, as reference voltage Vref is configurable from 0V to 1/2VCC2.
• External excitation PWM drive enables wide operating supply voltage range (VCC1 = 10 to 45V).
• Built-in current sense resistor (0.22Ω) integrated within the hybrid IC.
• Power MOSFETs employed to reduce drive loss.
• Motor output drive current IOH = 1.2A.

• Fax machine stepper motor drive (send and receive)
• Copier paper feed and optical system stepper motor drive
• Laser printer drum drive
• Printer carriage stepper motor drive
• Other stepper motor applications