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PDF STK672-440B-E Data sheet ( Hoja de datos )
| Número de pieza | STK672-440B-E | |
| Descripción | 2-phase Stepper Motor Driver | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENA1734A
STK672-440B-E
Thick-Film Hybrid IC
2-phase Stepping Motor Driver
http://onsemi.com
Overview
The STK672-440B-E is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
Applications
• Office photocopiers, printers, etc.
Features
• Built-in motor terminal open detection function (output current OFF).
• Built-in overcurrent detection function (output current OFF).
• Built-in overheat detection function (output current OFF).
• FAULT1 signal (active low) is output when any of motor terminal open, overcurrent, or overheat is detected.
The FAULT2 signal is used to output the result of activation of protection circuit detection at 3 levels.
• Built-in power on reset function.
• A micro-step sine wave-driven driver can be activated merely by inputting an external clock.
• External pins can be used to select 2, 1-2 (including pseudo-micro), W1-2, 2 W1-2, or 4W1-2 excitation.
• The switch timing of the 4-phase distributor can be switched by setting an external pin (MODE3) to detect either the
rise and fall, or rise only, of CLOCK input.
• Phase is maintained even when the excitation mode is switched. Rotational direction switching function.
• Supports schmitt input for 2.5V high level input.
• Incorporating a current detection resistor (0.122Ω: resistor tolerance ±2%), motor current can be set using two
external resistors.
• The ENABLE pin can be used to cut output current while maintaining the excitation mode.
• With a wide current setting range, power consumption can be reduced during standby.
• No motor sound is generated during hold mode due to external excitation current control.
Semiconductor Components Industries, LLC, 2013
June, 2013
71311HKPC 018-11-0005/61610HKPC No.A1734-1/26
1 page  
Block Diagram
STK672-440B-E
VDD
9
MOI FAULT2 Vref
7 8 19
A AB B BB
4531
MODE1 10
MODE2 11
CWB 13
CLOCK 12
MODE3 17
RESETB 14
ENABLE 15
FAULT1 16
Excitation mode
selection
Rising edge / falling
edge detection
Phase
advance
counter
1÷4.9
Current divider
ratio switching
Pseudo sine
wave generator
VSS
Power-on
reset
Phase
excitation
signal
generator
Overheating
detection
Latch
Oscillator
Reference
clock
generator
PWM
control
Overcurrent
detection
Open
detection
S.G 18
SUB
F1 F2 F3 F4
2 P.G2
6 P.G1
Sample Application Circuit
VDD=5V
CLOCK
ENABLE
CWB
MOI
C02
10μF
R01
+
R02
S.G
FAULT1
FAULT2
STK672-440B-E
10
11
17
12
15
13
7
RESETB
14
9
2-phase stepping motor
A
4
AB
5
B
3
BB
1
Vref
19
P.G2
2
8
16 18
6
P.G1
VCC=24V
+
C01
at least 100μF
P.GND
No.A1734-5/26
5 Page 
STK672-440B-E
[Vref (Voltage setting to be used for the current setting reference)]
• Pin type: Analog input configuration
Input voltage is in the voltage range of 0.2V to 1.8V.
[Input timing]
The control IC of the driver is equipped with a power on reset function capable of initializing internal IC operations
when power is supplied. A 4V typ setting is used for power on reset. Because the specification for the MOSFET gate
voltage is 5V±5%, conduction of current to output at the time of power on reset adds electromotive stress to the
MOSFET due to lack of gate voltage. To prevent electromotive stress, be sure to set ENABLE=Low while VDD,
which is outside the operating supply voltage, is less than 4.75V.
In addition, if the RESETB terminal is used to initialize output timing, be sure to allow at least 10μs until CLOCK
input.
Control IC power (VDD) rising edge
4Vtyp
3.8Vtyp
Control IC power on reset
RESETB signal input
ENABLE signal input
No time specification
CLOCK signal input
At least 10μs
At least 10μs
ENABLE, CLOCK, and RESETB Signals Input Timing
[Configuration of control block I/O pins]
<Configuration of the MODE1, MODE2, MODE3, CLOCK,
CWB, ENABLE, and RESETB input pins>
<Configuration of the FAULT2 pin>
10kΩ
5V
Output pin
Pin 8
5V
50kΩ
50kΩ Motor terminal open
Input pin
100kΩ
50kΩ Overcurrent
VSS
Overheating
(The buffer has an open drain configuration.)
The input pins of this driver all use Schmitt input. Typical specifications at Tc=25°C are given below. Hysteresis
voltage is 0.3V (VIHa-VILa).
When rising
1.8Vtyp
Input voltage
VIHa
When falling
1.5Vtyp
VILa
No.A1734-11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet STK672-440B-E.PDF ] | |
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