Overview

The STK672-340-E is a unipolar fixed-current chopper type 2-phase stepping motor driver hybrid IC. It features power MOSFETs in the output stage and a built-in phase signal distribution IC. The incorporation of a phase distribution IC allows the STK672-340-E to control the speed of the motor based on the frequency of an external input clock signal. It supports two types of excitation for motor control: 2-phase excitation and 1-2 phase excitation. It also provides a function for switching the motor direction.

Features

• The motor speed can be controlled by the frequency of an external clock signal (the CLOCK pin signal).

• The excitation type is switched according to the state (low or high) of the MODE pin. The mode is set to 2-phase or 1-2 phase excitation on the rising edge of the clock signal.

• A motor direction switching pin (the CWB pin) is provided.

• Supports Schmitt input for 2.5V High level input.

• The motor current can be set by changing the Vref pin voltage. Since a 0.14Ω current detection resistor is built in, a current of 1A is set for each 0.14V of applied voltage.

• The input frequency range for the clock signal used for motor speed control is 0 to 50kHz.

• Supply voltage ranges: VCC = 10 to 42V, VDD = 5.0V ±5

• This IC supports motor operating currents of up to 2.2A at Tc = 105°C, and of up to 3.6A at Tc = 25°C.

• Provides a function that, during clock input, forces all MOSFET devices to the off state when the ENABLE pin is set low, and then, when ENABLE is set high, resumes operation continuing with the prior excitation timing.

Applications

• Two-phase stepping motor drive in send/receive facsimile units.

• Paper feed in copiers, industrial robots, and other applications that require 2-phase stepping motor drive.