|Category||Interface and Interconnect|
|Company||Sanyo Semiconductor Corporation|
|Datasheet||Download STK672-120 datasheet
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
The 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-k (typical: to +100%) pull-up resistors are built in. The motor current can be set by changing the Vref pin voltage. Since a 0.165- current detection resistor is built in, a current A is set for each V of applied voltage. The input frequency range for the clock signal used for motor speed control to 25 kHz. Supply voltage ranges: V ±5% This IC supports motor operating currents = 105°C, and = 25°C.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 or 1-2 phase excitation on the rising edge of the clock signal. A motor direction switching pin (the CWB pin) is provided.
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Parameter Maximum supply voltage 1 Maximum supply voltage 2 Input voltage Output current Repeated avalanche capacity Allowable power dissipation Operating substrate temperature Junction temperature Storage temperature Symbol VCC max VDD max VIN max IOH max Ear max Pd max Tc max Tj max Tstg With an arbitrarily large heat sink. Per MOSFET No signal No signal Logic input pins VDD 5 V, CLOCK 200 Hz Conditions Ratings to +125 Unit W °C
Parameter Maximum supply voltage 1 Maximum supply voltage 2 Input voltage Phase current 1 Phase current 2 Clock frequency Phase driver withstand voltage Symbol VCC VDD VIH IOH1 IOH2 fCL VDSS = 105°C, CLOCK = 80°C, CLOCK 200 Hz See the motor current (IOH) derating curve Minimum pulse width: 1 mA (Tc = 25°C) With signals applied With signals applied Conditions Ratings 10 to VDD 25 100 min Unit kHz V
Parameter VDD supply current Output current FET diode forward voltage Output saturation voltage High-level input voltage Low-level input voltage Input current Vref input voltage Vref input bias current Note: A fixed-voltage power supply must be used. Symbol ICCO Ioave Vdf Vsat VIH VIL IIL VrH IIB CLOCK = GND With R/L mH in each phase Vref 1 A (RL = 23 Pins 9 (4 pins) Pins 9 (4 pins) With pins 9 at the ground level. Pull-up resistance: 40 k (typical) Pin 12 With pin 1 V Conditions Ratings min typ max Unit V nA
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