STK672-080 查看數據表（PDF） - SANYO -> Panasonic

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STK672-080

Stepping Motor Driver (Sine Wave Drive) Output Current: 2.8 A (No Heat Sink*)

SANYO -> Panasonic 

STK672-080

Functional Description

External Excitation Chopper Drive Block Description

VCC1

IOFF

L2

D1

ION

Enable ØA (control signal)

Current

divider

L1

MOSFET AND

Divider

45kHz

S

CR

oscillator

800kHz

Q Latch circuit

R Noise

filter

Vref

A=1

–

+

Rs

Driver Block Basic Circuit Structure

A13263

Since this hybrid IC adopts an external excitation method, no external oscillator circuit is required.

When a high level is input to øA in the basic driver block circuit shown in the figure and the MOSFET is turned on, the

comparator + input will go low and the comparator output will go low. Since a set signal with the PWM period will be

input, the Q output will go high, and the MOSFET will be turned on as its initial value.

The current ION flowing in the MOSFET passes through L1 and generates a potential difference in Rs. Then, when the Rs

potential and the Vref potential become the same, the comparator output will invert, and the reset signal Q output will

invert to the low level. Then, the MOSFET will be turned off and the energy stored in L1 will be induced in L2 and the

current IOFF will be regenerated to the power supply. This state will be maintained until the time when an input to the

latch circuit set pin occurs.

In this manner, the Q output is turned off and on repeatedly by the reset and set signals, thus implementing constant

current control. The resistor and capacitor on the comparator input are spike removal circuit elements and synchronize

with the PWM frequency. Since this hybrid IC uses a fixed frequency due to the external excitation method and at the

same time also adopts a synchronized PWM technique, it can suppress the noise associated with holding a position when

the motor is locked.

Input Pin Functions

Pin No.

11

10

15

8, 9, 12

13

7

Symbol

CLK

CWB

ENABLE

M1, M2, M3

RESET

Vref

Function

Phase switching clock

Rotation direction setting (CW/CCW)

Output cutoff

Excitation mode setting

System reset

Current setting

Pin circuit type

Built-in pull-up resistor CMOS Schmitt trigger input

Built-in pull-up resistor CMOS Schmitt trigger input

Built-in pull-up resistor CMOS Schmitt trigger input

Built-in pull-up resistor CMOS Schmitt trigger input

Built-in pull-up resistor CMOS Schmitt trigger input

Input impedance 6 kΩ (typ.) ±30%

No. 6507-7/17

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