Ordering number : ANDSTK673010E011E
STK673-010-E
STK673-011-E
Thick-Film Hybrid IC
Bipolar Fixed-current Chopper (external Excitation PWM)
Built-in Microstepping Control
3-Phase Stepping Motor Driver
(Sine wave drive) Output Current 2.4A
Overview
The STK673-010/011-E is a 3-phase-stepping motor driver hybrid IC with built-in microstepping controller
having a bipolar constant-current PWM system, in which a power MOSFET is employed at an output
stage.
It includes a 3-pahase distribured controller for a 3-pahse stepping motor to realize a simple configuration
of the motor driver circit.
This number of motor revolution can be controlled by the frequency of extermal clock input. 2, 2-3,
w2-3-phase excition modes are available. The base step angle of the stepping motor can be separated as
much as one-eighth 2-3-phase to 2w2-3-phase excitation mode control quasi-sine wave currnt, thereby
realizing low vibration and low noise.
Features
• Number of motor revolution can be controlled by the frequency of extermal clock input.
• 4 types of modes, i.e, 2,2-3,w2-3 and 2w2-3phase excitations,are available which can be selected based
on rising of clock signals, by switching highs and lows of Mode A and B terminals.
• Setting a Mode C terminal Low allows an excitation mode that is based on rising and falling of a clock
signal.
By setting the Mode C terminal Low, phases that are set only by Mode A and Mode B can be changed to
other phases as follows without changing the number of motor revolution: 2-phase may be switched to
2-3-phase; 2-3-phase may be swiched to w2-3-phase; and w2-3-phase may be switched to 2w2-3-phase.
•Phase is maintationed even when excitation mode is changed.
• An MOI output terminal which outputs 1pilse per 1cycle of phase current.
•A CW/CCW terminal which switches the rotational direction.
•A Hold terminal which can temporariy holds the motor in a state where the phase current is normal
operation.
•An Enable terminal which can forcibly turns OFF a MOSFET of a 6output driving element in normal
peration.
•Schmit inputs with built-in pull-up resistor (20kΩ typ)
•Motor current can be set by changing the voltage of the verf terminal (0.63v per 1A, dealing as much as 0
to 1/2 vcc2 (4A)).
•The clock input for controlling the number of motor revolution lise of 0 to 50 KHz.
•Supply voltage: vcc1=16 to 30v, vcc2=5.0v±5%.
•A built-in current detection resistor (0.227Ω).
•A motor current during revolution can deal with as 2.4A at Tc=105deg and as high as 4A at Tc=50deg or
lower.
Rev.1 1/27
