STK672-210 데이터 시트보기 (PDF) - SANYO -> Panasonic

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STK672-210

Unipolar Constant-Current Chopper Two-Phase Stepping Motor Driver Output Current: 1.4 A

SANYO -> Panasonic 

STK672-210

Setting the Motor Current Peak Value (IOH)

IOH ≈ Vref ÷ Rs

Vref: STK672-210 pin 12 input voltage

Rs: STK672-210 internal current detection resistor (0.195 Ω ±2%)

IOH

0

Model of the Motor Phase Current Flowing into the Driver IC (pins 2, 3, 4, and 5)

Vref = (Ro2 ÷ (Ro1 + Ro2)) × VCC2

VCC2 = 5 V

Current Switching Techniques

Due to the input bias current (IIB) specifications, Ro1 must be under 100 kΩ.

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

Ro1

Vref

Ro3 Ro2

5V

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 12

Circuit type

MOSFET gate signal

10 kΩ

10 kΩ

XB phase PWM signal

5V

To XB phase

5V

When switch 1 is in the ground

position, the input resistor will be

a 20 kΩ pull-down resistor.

VCC2

CR input

Vref

To one of the comparator

GND

No.7464-5/8

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