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PDF STK672-120 Data sheet ( Hoja de datos )
| Número de pieza | STK672-120 | |
| Descripción | Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current: 2.4 A | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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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
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 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 Dimensions
unit: mm
4167
[STK672-120]
46.6
41.2
8.5
3.6
1 12
2.0 0.5
(9.6) 11×2 = 22
0.4
2.9
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
12299RM(OT) No. 6042-1/9
1 page  
STK672-120
Usage Notes
• 5-V system input pins
[RESETB and CLOCK (Input signal timing when power is first applied)]
As shown in the timing chart, a RESETB signal input is required by the driver to operate with the timing in which the F1
gate is turned on first. The RESETB signal timing must be set up to have a width of at least 20 µs, as shown below.
The capacitor CO4 and the resistor RO3 in the application circuit form simple reset circuit that uses the RC time
constant rising time. However, when designing the RESETB input based on CMOS levels, the application must have
the timing shown in figure 1.
Rise of the 5-V supply voltage
RESETB signal input
CLOCK signal
At least 20 µs
At least 10 µs
Figure 1 RESETB and CLOCK Signals Input Timing
See the timing chart for details on the CLOCK, MODE, CWB, and other input pins.
[Vref <Motor current peak value setting>]
In the sample application circuit, the peak value of the motor current (IO) is set by RO1, RO2, and VDD (5 V) as
described by the formula below.
Figure 2 Motor Current IO Flowing into the Driver IC
IOH = Vref ÷ Rs Here, Rs is hybrid IC internal current detection resistor
Vref = (R02 ÷ (R01 + R02)) × 5 V
STK672-120 : Rs = 0.165 Ω
• Allowable motor current operating range
The motor current (IO) must be held within the range corresponding to the area under the curve shown in figure 4.
For example, if the operating substrate temperature Tc is 105°C, then IO must be held under IO max = 2.4 A, and in
hold mode IO must be held under IO max = 2.0 A.
No. 6042-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet STK672-120.PDF ] | |
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