KA8328D 查看數據表（PDF） - Fairchild Semiconductor

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KA8328D

2-PHASE DRUM MOTOR DRIVER

Fairchild Semiconductor 

KA8328D

VCR PRODUCTS

APPLICATION INFORMATION

1.The whole system concept of the KA8328D can be briefly diagrammatized as follows. Namely it may be though

to be an amplifier whose on-off action is operated in accordance with the output signals of the hall sensors which

detects the rotor position. The servo current (ICTL) inputted in the input terminal controls the output current (IO) of

the output terminal and the motor speed. At is the gain of the whole system, and determines the characteristic of

the output to the input as in the following diagram.

Input

Terminal

Hall signal

Output

IO Terminal Motor

IO

IOmax

AT

2 ICTL

13 17

<Whole system concept diagram>

ICTLmax

ICTL

<Whole system concept diagram>

2.Also the output current (IO) can be controlled through inputting the servo voltage (VCTL) instead of the servo

current (ICTL) which applied to the input terminal. In this case, by using the V-I converter as in the following

diagram, the servo voltage (VCTL) is converted in turn into a current (IVO) to control the output current (IO).

Input

Terminal

2

ICTL

Hall signal

IO

Output

Terminal

13 17

Motor

3 VCTL

V-I

Converter

<Whole system concept diagram>

IO

IOmax

AT

VREF (2.3V)

5V

<Input-output characteristic graph>

VCTL

6

MIC-99D001

January 1999

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