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STK672-210-E Folha de dados(PDF) 5 Page - ON Semiconductor

Nome de Peças STK672-210-E
Descrição Electrónicos  Two-Phase Stepping Motor Driver Output Current 1.4A
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

STK672-210-E Folha de dados(HTML) 5 Page - ON Semiconductor

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STK672-210-E
No. 7464-5/10
Setting the Motor Current Peak Value (IOH)
IOH ≈ Vref ÷ Rs
Vref: STK672-210-E pin 12 input voltage
Rs: STK672-210-E internal current detection resistor (0.195
Ω ±2%)
Model of the Motor Current Flowing into the Driver IC (pins 2, 3, 4, and 5)
Vref = (Ro2
÷ (Ro1 + Ro2)) × VCC2
VCC2 = 5V
Current Switching Techniques
Due to the input bias current (IIB) specifications, Ro1 must be under 100kΩ.
The figures below present sample circuits that temporarily switch the motor current when, for example a held motor
stops.
We recommend using the circuit structure in the figure at the left to minimize as much as possible the effects of the
saturation voltage of the reference voltage switching transistor.
Switching Circuit 1
Switching Circuit 2
Input Pin Circuits
Input pin
Circuit type
Pin 6, 7, 8, and 9
Pin 12
IOH
0
5V
Ro1
Ro3
Ro2
Vref
Ro1
Ro3
Ro2
Vref
5V
Vref
To one of the comparator
CR input
GND
VCC2
The 5V/GND switch shows how toff
time setting operates in the internal
block diagram on page 3. When
switched to GND, pull-down with an
input resistance of 20k
Ω is formed.
MOSFET gate signal
10k
Ω
5 V
10k
Ω
5V
To XB phase
XB phase PWM signal
X phase
(XB phase)


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