Overview

The STK672-080 is a stepping motor driver hybrid IC that uses power MOSFETs in the output stage. It includes a built-in microstepping controller and is based on a unipolar constant-current PWM system. The STK672-080 supports application simplification and standardization by providing a built-in 4 phase distribution stepping motor controller. It supports five excitation methods: 2 phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase excitations, and can provide control of the basic stepping angle of the stepping motor divided into 1/16 step units. It also allows the motor speed to be controlled with only a clock signal.

The use of this hybrid IC allows designers to implement systems that provide high motor torques, low vibration levels, low noise, fast response, and high-efficiency drive. Compared to the earlier SANYO STK672-050, the STK672-080 features a significantly smaller package for easier mounting in end products.

Features

• Can implement stepping motor drive systems simply by providing a DC power supply and a clock pulse generator.

• One of five drive types can be selected with the drive mode settings (M1, M2, and M3)

—2 phase excitation drive

—1-2 phase excitation drive

—W1-2 phase excitation drive

—2W1-2 phase excitation drive

—4W1-2 phase excitation drive

• Phase retention even if excitation is switched.

• The MOI phase origin monitor pin is provided.

• The CLK input counter block can be selected to be one of the following by the high/low setting of the M3 input pin.

—Rising edge only

—Both rising and falling edges

• The CLK input pin include built-in malfunction prevention circuits for external pulse noise.

• ENABLE and RESET pins provided. These are Schmitt trigger inputs with built-in 20 kΩ(typical) pull-up resistors.

• No noise generation due to the difference between the A and B phase time constants during motor hold since external excitation is used.

• Microstepping operation supported even for small motor currents, since the reference voltage Vref can be set to any value between 0 V and 1/2 VCC2.

• External excitation PWM drive allows a wide operating supply voltage range (VCC1 = 10 to 45 V) to be used.

• Current detection resistor (0.15 Ω) built into the hybrid IC.

• Power MOSFETs for minimal driver loss

• Motor output drive currents IOHup to 2.8 A (When Tc = 105°C).

Applications

• Facsimile stepping motor drive (send and receive)

• Paper feed and optical system stepping motor drive in copiers

• Laser printer drum drive

• Printer carriage stepping motor drive

• X-Y plotter pen drive

• Industrial robots and other stepping motor applications