STK672-120

Ordering number : EN6042 Thick-Film Hybrid IC STK672-120 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: 2.4 A Overview The STK672-120 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 STK672-120 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 All input are Schmitt inputs and 40-kΩ (typical: –50 to +100%) pull-up resistors are built in. The motor current can be set by changing the Vref pin voltage. Since a 0.165-Ω current detection resistor is built in, a current of 1 A is set for each 0.165 V of applied voltage. The input frequency range for the clock signal used for motor speed control is 0 to 25 kHz. Supply voltage ranges: VCC1 = 10 to 42 V, VCC2 = 5.0 V ±5% This IC supports motor operating currents of up to 2.4 A at Tc = 105°C, and of up to 4.0 A at Tc = 25°C. Package Dimensio...