STK672-110-E

Ordering number : EN6041A STK672-110-E Thick-Film Hybrid IC Unipolar Fixed-Current Chopper (Self-Excited PWM) Scheme and Built-in Phase Signal Distribution IC Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current 1.8A http://onsemi.com Overview The STK672-110-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 STK672-110-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. 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 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. All inputs are schmitt inputs and 40kΩ (typical: –50 to +100%) pull-up resistors are built in. The motor current can be set by changing the Vref pin voltage. Since a 0.22Ω current...