KA8328 データシートの表示（PDF） - Fairchild Semiconductor

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KA8328

2-PHASE DRUM MOTOR DRIVER

Fairchild Semiconductor 

KA8328D

VCR PRODUCTS

4.With having the output signal of the hall sensor which detects the rotor position and the servo current (or voltage)

which controls the output current as in the following diagram, the differential amplifiers in the hall input parts are

operated so that the current may flow at a proper phase of the motor.

Motor

A phase signal

Hall sensor

Hall sensor

Motor

B phase signal

Servo

Circuit

ICTL

VCTL

Hall input

7

IN1

Hall input

8

IN2

9

2

V-I

Converter

3

AMP

(For motor A phase)

AMP

(For motor B phase)

<Input part diagram>

The followings is the simplified circuit diagram of the input part circuit. Firstly when the input control current (ICTL)

is inputted, TR Q5 is operated, and TR Q3 or TR Q4 of the differential amplifier is operated in accordance with

the output signal of the Hall sensor, and so the current (I1) is outputted.

Next when the input control voltage (VCTL) is inputted, if the input voltage is higher than the standard voltage

(VREF, 2.3V), TR Q1 is operated, and so TR Q5 is operated by the current source (IS).

ICTL

2

VCTL

3

VREG

IS

Q1 Q2

VREF

VREG

I1

AMP

(For motor A phase)

7

Q3 Q4

8

Q5

* The differential amplifier

is described about IN1 only.

<Input part circuit>

8

MIC-99D001

January 1999

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