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PDF STK672-401C-E Data sheet ( Hoja de datos )
| Número de pieza | STK672-401C-E | |
| Descripción | 2-phase Stepping Motor Driver | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENA2137
STK672-401C-E
Thick-Film Hybrid IC
2-phase Stepping Motor Driver
http://onsemi.com
Overview
The STK672-401C-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
• Entry of external clock is enough to activate the micro step sinusoidal driver.
• The excitation mode of 2, 1-2, W1-2, 2W1-2, or 4W1-2 can be selected with the external pin.
• The 4-phase distributor switching timing can be set to occur either on both rising and falling edge detection or on
rising edge detection only with an external pin (MODE3).
• A phase holding function is provided to prevent phase skip during switching of excitation in the course of operation.
• The motor current is set by a voltage divider formed by an external resistor connected to the Vref pin.
• The CLK input pin is provided with an internal noise filtering circuit in addition to a Schmidt circuit to increase the
margin for extraneous noise.
• When set low, the ENABLE pin turns off the motor drive current for all phases and retains the phase excitation state.
Semiconductor Components Industries, LLC, 2013
June, 2013
O1712HKPC 018-07-0001 No.A2137-1/19
1 page  
Precautions
STK672-401C-E
[Internal MOSFET Destruction]
• The internal MOSFFET gate voltage is supplied from the 5V power supply. If the 5V power supply voltage is below
its allowable operating voltage range, the resultant insufficient gate drive state may destroy the MOSFET.
[GND wiring]
• To reduce noise in the 24V system, locate the ground side of CO1 in the circuit above as close as possible to pins 2
and 6 on the hybrid IC. Also, to assure that the current is set accurately, the Vref ground side must be connected to a
ground point that is a shared connection between the ground pin (pin 18, S.G) used for the current setting and P.G1
and P.G2.
• If the VSS pin (pin 16) near the driver, the S.G pin (pin 18), the P.G1 pin (pin 2), and the P.G2 pin (pin 6) cannot be
connected to a single-point ground, connect the VSS pin to the control system S.GND, and the S.G pin to the P.G1 pin
and the P.G2 pin.
[Input pins]
• The voltage range for the input pins is -0.3 to +5.8V. Design applications so that voltages lower than -0.3V and higher
than 5.8V are never applied to the input pin.
• Do not connect any of the NC pins (pins 7, and 8) shown in the internal equivalent circuit block diagram to the circuit
pattern on the printed circuit board.
• Connect a resistor (1kΩ) so that discharge energy of capacitor CO2 does not enter the hybrid IC.
• Inputs to pins 10, 11, 12, 13, 14, 15, and 17 are signal whose high level is 2.5V. Both TTL and CMOS inputs are
supported.
• Internal pull-up resistors are not provided for the input pins. If this hybrid IC's inputs are controlled by open-collector
type circuits, external pull-up resistors must be provided.
• If resistors are connected in series with the inputs, insert capacitors between the inputs and ground to prevent
malfunctions due to the hybrid IC's switching noise.
• In the application circuit example, a simple reset circuit is formed by D1, RO3, CO2, and a 1kΩ resistor. This circuit
will not create a reset signal if the 5V supply voltage drops briefly. This circuit structure requires the 5V supply
voltage to fall below 0.6V to operate.
Connect the hybrid IC directly to VDD to use the hybrid IC's power on reset function.
• A power on reset operation must be applied when the 5V power supply level is first applied.
[Vref Current Setting]
• To reduce the influence of input impedance 200kΩ input current of the terminal Vref, RO1 recommends about 1kΩ.
• We recommend using the following circuit to temporarily reduce the motor current.
• Although the driver provides a constant current control function, it does not have an overcurrent protection function to
assure that the maximum output current, IOH max, is not exceeded. If Vref is set by mistake to a voltage that such
that IOH max is exceeded, the driver will draw excessive current and the device will be destroyed.
• If the Vref pin (pin 19) is left open, the Vref voltage will be set to about 2.5V. With the STK672-400, the motor
current will then be about 1.8A. With the STK672-410, the motor current will be about 3.2A. These current settings
are close to IOH max.
5V 5V
RO1
Vref
R3 RO2
RO1
R3
Vref
RO2
No.A2137-5/19
5 Page 
STK672-401C-E
[Vref (Sets the current that is used as the reference for setting the output current)]
(1) Pin circuit type: Analog input (differential amplifier). Input resistance: 200kΩ
(2) Function: The input voltage must be in the voltage range from the control system power supply VDD to 2V. Note
that there is a resistance component (200kΩ, typical) in this hybrid IC's input and that therefore an input
current occurs.
If the Vref voltage structure is formed as a resistor voltage divider, that circuit must be designed to take
that input current into account. The input current is 12.5μA (typical). Note that this is the current when
Vref is 5V. The input current falls according to the formula shown below when the Vref voltage is below
that level.
Ios=Vref/(200k+200k) --------- (1)
• Input circuit structure
STK672-401C-E
Vref
Hybrid IC pin 19
Ios=12.5μA 200kΩ
200kΩ : ±1%
200kΩ
to DAC
2.5V
No.A2137-11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet STK672-401C-E.PDF ] | |
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