STK672-060 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

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STK672-060

Unipolar constant-current chopper (external excitation PWM) circuit with built- in microstepping controller

SANYO -> Panasonic 

STK672-060

Power-on reset

The application must perform a power-on reset operation when VCC2 power is first applied to this hybrid IC.

Application circuit that used 2W1-2 phase excitation (microstepping operation) mode

VCC2=5V

VCC1=10V to 45V

Simple power-on reset circuit

(This circuit cannot be used to

detect drops in the supply voltage.)

VCC2=5V

VF≈0.3V

CLK

ENABLE

1kΩ

+ RESET

RET

MoI

Mo1

Mo2

Two-phase stepping motor

7

9

6A

10

5A

11

2B

+

12

1B

143

15

SG

14 STK672-060 3

PG

18

16

17

19

20

21

22

4

VCC2=5V

8 RoX

Ro1

Vref

Ro2

A value of about 100 Ω is

recommended for Ro2 to minimize

the influence of the 6 kΩ internal

resistance of the Vref pin.

RoX: Input impedance of 6 kΩ ±30%

ITF02269

Motor Current Setting Procedure

The motor current IOH is set by the voltage on pin 8, Vref. The following formulas show the relationship between IOH

and Vref:

RoX = (Ro2 × 6 kΩ) ÷ (Ro2 + 6 kΩ)....................(1)

Vref = VCC2 × RoX ÷ (Ro1 + RoX) .....................(2)

IOH =

—1

K

×

—Vr—ef

Rs

...................................................(3)

K: 7.66 (voltage divider ratio),

Rs: 0.22 Ω (This is the hybrid IC's internal current detection resistor. It has a tolerance of ±3%.)

Motor currents range from the setting current (0.05 to 0.1 A) due to the frequency of the duty cycle set by the oscillator to

the current given in the allowable operating ranges (IOH = 1.2 A).

OA

Motor Current Waveform

Function Table

M2

M1

M3

1

0

0

0

2 phase excitation

1-2 phase excitation

0

1

1

1

0

1

1-2 phase excitation W1-2 phase excitation 2W1-2 phase excitation

W1-2 phase excitation 2W1-2 phase excitation 4W1-2 phase excitation

Ioave

IOL IOH

A13262

Phase switching CLK edge timing

Rising edge only

Both rising and falling edges

CWB

Mo1

Mo2

Forward

0

A

1

0

Reverse

1

A

0

0

ENABLE The motor current is cut when this pin is set to the low level.

RESET

Active low

B

B

0

1

1

1

No. 7441-6/19

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