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PDF STK672-010 Data sheet ( Hoja de datos )
| Número de pieza | STK672-010 | |
| Descripción | Thick-Film Hybrid IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN4927
Thick-Film Hybrid IC
STK672-010
Unipolar Fixed-Current Chopper (separate excitation)
Type 1.7 A Output Current Stepping Motor Driver
with Built-in 4-Phase Distribution Controller
Overview
The STK672-010 is a 4-phase stepping motor driver IC
that adopts power MOSFET for its output stage and that
uses a unipolar fixed-current chopper scheme. Since the
STK672-010 includes a built-in 4-phase distribution
controller, the stepping motor driver circuit and the control
scheme can be simplified, and the stepping motor driver
circuit structure can be standardized. The STK672-010
provides high torque, low vibration, and rapid response
based on a W1-2 phase excitation drive scheme. The
motor current is voluntary set from externals. Since,
compared to the earlier STK6770 Series, the STK672-010
has a smaller package size and reduced drive power
dissipation (reduced by 70% over previous products), it
provides a wider operating power supply voltage range.
Applications
• Send/receive stepping motors in facsimile equipment
• Stepping motor drive for paper feed and optical systems
in copier, and drum drive in laser beam printers
• Pen drive in X-Y plotters
• Industrial robots and other stepping motor application
products
Features
• The STK672-010 can easily implement stepping motor
drive applications with the provision of a DC power
supply and a clock pulse oscillator.
<4-Phase Distribution Controller>
• The STK672-010 supports four excitation types selected
by the excitation mode setting (M1 and M2).
1. 4-phase 1 excitation
2. 4-phase 1-2 excitation
3. 4-phase 2 excitation
4. 4-phase W1-2 excitation
• Schmitt input pins (for a high noise margin)
• Controller inputs are CMOS compatible (with built-in
pull-up resistors), thus allowing direct control from I/O
ports or special-purpose controller LSIs.
• An interval is set up during mutual switching of the AA
and BB phase output signals in 4-phase 2 excitation
mode.
<Driver Circuits>
• Since the STK672-010 is a separate excitation type
circuit, it supports a wide operating power supply
voltage range. (VCC1 = 5 to 42 V)
• Current detection resistors are provided within the
hybrid IC.
• Drive power reduced by 70% when compared to the
STK6770 Series (at 1 A drive).
• Can provide a motor drive current of up to 1.7 A without
a heat sink.
Package Dimensions
unit: mm
4149
[STK672-010]
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
D2094TH (OT) 5-3438 No. 4927-1/17
1 page  
STK672-010
STK672-010 Operation
<Separate Excitation Chopper Driver Block Operation>
Fig. 1 STK672-010 Driver Block Basic Circuit
Figures 1 and 2 show the driver block basic circuit and the waveforms in the various blocks.
Unlike the earlier STK6710 Series, which adopted MOSFET transistors, the STK672-010 implements a fixed current
drive scheme with separate excitation.
When the FET is turned on by a high level input
on the øA signal in the driver block basic circuit,
the comparator + pin goes low and the comparator
output goes low. The L1 current ION that flows in
the FET at this time is given by the following
formula.
ION =
VCC1 – Vsat
R
(1
–
e–
R
L
t) .....................
(1)
L: Coil inductance
R: The sum of the coil resistance and Rs
Then, when the Rs voltage becomes equal to
Vref, the FET turns off. At this point the energy
stored in the inductor L1 induces a current in L2
and the current IOFF flows. The time that the
current IOFF flows is proportional to the off time
set at the oscillator.
Fig. 2 Waveform Timing Chart
Thus the chopping operation is partially fixed at the oscillator frequency by the latch function.
The STK672-010 repeats the operation of switching the motor current on and off, i.e., fixed current chopping operation,
as described above.
No. 4927-5/17
5 Page 
A: Fixed Common Current Form
STK672-010
B: Square Form
C: Circle Form
Fig. 10 W1-2 Phase Excitation Control Angle Concepts
No. 4927-11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet STK672-010.PDF ] | |
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