STK672-220-E Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

STK672-220-E

Two-Phase Stepping Motor Driver Output Current 2.8A

ON Semiconductor 

STK672-220-E

Setting the Motor Current Peak Value (IOH)

IOH ≈ Vref ÷ Rs

Vref: STK672-220-E pin 12 input voltage

Rs: STK672-220-E internal current detection resistor (0.17Ω ±2%)

IOH

0

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.

5V

5V

Ro1

Vref

Ro3 Ro2

Ro1

Vref

Ro3 Ro2

Switching Circuit 1

Switching Circuit 2

Input Pin Circuits

Input pin

Pin 6, 7, 8, and 9

X phase

(XB phase)

Pin 11

Pin 12

10kΩ

10kΩ

Circuit type

MOSFET gate signal

XB phase PWM signal

5V

To XB phase

5V

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 20kΩ is formed.

Inhibit

10kΩ

10kΩ

GND

VCC2

CR input

Vref

To one of the comparator

GND

No.7465-5/10

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