Overview
The STK672-020 is a 4-phase stepping motor driver IC that adopts power MOSFET for its output stage and that uses a unipolar fixed-current chopper scheme. Since the STK672-020 includes a built-in 4-phase distribution controller, the stepping motor driver circuit and the control scheme can be simplified, and the stepping motor driver circuit structure can be standardized. The STK672-020 provides high torque, low vibration, and rapid response based on a W1-2 phase excitation drive scheme. The motor current is voluntary set from externals.

FEATUREs
• The STK672-020 can easily implement stepping motor drive applications with the provision of a DC power supply and a clock pulse oscillator.

<4-Phase Distribution Controller>
• The STK672-020 supports four excitation types selected by the excitation mode setting (M1 and M2).
   1. 4-phase 1 excitation
   2. 4-phase 1-2 excitation
   3. 4-phase 2 excitation
   4. 4-phase W1-2 excitation
• Schmitt input pins (for a high noise margin)
• Controller inputs are CMOS compatible (with built-in pull-up resistors), thus allowing direct control from I/O ports or special-purpose controller LSIs.
• An interval is set up during mutual switching of the AA and BB phase output signals in 4-phase 2 excitation mode.

<Driver Circuits>
• Since the STK672-020 is a separate excitation type circuit, it supports a wide operating power supply voltage range. (VCC1 = 5 to 42 V)
• Current detection resistors are provided within the hybrid IC.
• Drive power reduced by 70% when compared to the STK6770 Series (at a 1 A drive).
• Can provide a motor drive current of up to 2.0 A without a heat sink.

APPLICATIONs
• Send/receive stepping motors in facsimile equipment
• Stepping motor drive for paper feed and optical systems in copier, and drum drive in laser beam printers
• Pen drive in X-Y plotters
• Industrial robots and other stepping motor application products