STK672-060 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

STK672-060

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

SANYO -> Panasonic 

IC Operation

External Excitation Chopping Driver Block

VCC1

STK672-060

M4 M5

IOFF

L2

A

D1

ION

Enable øA (Control signal)

Current

divider

L1

A

MOSFET AND

Divider

45kHz

S

RC

oscillator

800kHz

Q Latch circuit

R Noise

filter

Vref

A=1

–

+

Rs

Driver Block Basic Circuit Structure

ITF02272

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

If a high level is input on the øA line in the driver block basic circuit in the figure and the MOSFET is turned on, the

comparator + input will go to the low level and the comparator output will go to the low level. Meanwhile, since the set

signal is input during the PMW period, the Q output will go to the high level and the initial state of the MOSFET will be

the on state.

The current ION that flows in the MOSFET will pass through L1 generating a potential difference across Rs. Then, when

the Rs potential becomes the same as the Vref potential, the comparator output will invert, the reset signal will be

generated, and the Q output will invert, into the low level. This turns the MOSFET off and the energy stored in L1 is

induced in L2, and IOFF is regenerated to the power supply. This state is maintained for the time that the set signal is

input to the latch circuit.

The Q output is turned on and off repeatedly by the set and reset signals in this manner, which implements constant

current control. The resistor and capacitor connected at the comparator input synchronize with the PWM period of the

spike absorption circuit.

Because of the fixed period due to the external excitation method adopted and synchronized PWM system, this circuit

can minimize hold noise generated when the motor position is locked.

Input Pin Description

Pin No.

14

15

17

18

9, 10, 11

12, 13

16

8

Pin

CLK

CWB

RETURN

ENABLE

M1, M2, M3

M4, M5

RESET

Vref

Function

Phase switching clock

Rotation direction setting (CW/CCW)

Forcible return to phase origin

Output cutoff

Excitation mode setting

Vector locus setting

System reset

Current value setting

Pin circuit type

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Operational amplifier input

No. 7441-8/19

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