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.

• 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.

• 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