KA3010D 查看數據表（PDF） - Fairchild Semiconductor

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产品描述 (功能)

生产厂家

KA3010D

4-CH MOTOR DRIVER

Fairchild Semiconductor 

CD-ROM PRODUCTS

3. OP-AMP

Op-amp is integrated in the IC for user’s convenience.

KA3010D

AMP-I(+)

+

16 pin

14 pin

AMP -I(−)

−

AMP-O

15 pin

4. DRIVER

VREF

(2.5V)

10k

CH-I

(3, 10, 19, 25 Pin)

CH-GA

(4, 9, 20, 24 Pin)

AMP

+

−

10k

Level

shift

+∆I + Buffer

−

−∆I

Buffer

+

−

Q1 −∆V

+∆V Q2

M

CH-O

(1, 12,

Q3 17, 27 Pin)

CH-O

(2, 11,

18, 26 Pin) Q4

• The voltage, VREF, is the reference voltage given by the bias voltage of the pin #23.

• The input signal through the pin #3 is amplified by 10k/10k times and then fed to the level shift.

• The level shift produces the current due to the difference between the input signal and the arbitrary reference

signal. The current produced as +∆I and −∆I is fed into the driver buffer.

• Driver buffer operates the power TR of the output stage according to the state of the input signal.

• The output stage is the BTL driver and the motor is rotating in forward direction by operating TR Q1 and TR

Q4. On the other hand, if TR Q2 and TR Q3 is operating, the motor is rotating in reverse direction.

• When the input voltage through the pin #3 is below the VREF, then the direction of the motor in forward

direction.

• When the input voltage through the pin #3 is above the VREF, then the direction of the motor in reverse

direction.

• If it is desired to change the gain, then the pin #4 can be used.

• The gain (AV) of the drive circuit is as follows.

AV = 20 log

-4---V----I--N-

VIN

= 12(dB)

MIC-99D001

7

January 1999

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