KA9268D 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA9268D

4-CH Motor Driver

Fairchild Semiconductor 

FAN8000D (KA9268D)

3. OP-AMP

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

AMP-I(+)

+

16 pin

14 pin

AMP -I(−)

−

AMP-O

15 pin

4. DRIVER

3 10

19 25

4 24

9 20

VREF

(2.5V)

10k

100

AMP

+

−

10k

Level

shift

−∆I + Buffer

−

+∆I

Buffer

+

−

Q1 −∆V

+∆V Q2

M

1

2

11

Q3 17

12

18 Q4

27

26

• The voltage, VREF, is the reference voltage given by the bias voltage of the pin23.

• The input signal through the pin3 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 drives the power TR of the output stage according to 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 pin3 is below the VREF, the motor rotates in forward direction.

• When the input voltage through the pin3 is above the VREF, the motor rotates in reverse direction.

• To change the gain, pin4 or 24 can be used.

5. Connect a by-pass capacitor, 0.1µF between the supply voltage source.

VCC1 22

VCC2 21

104

6. Radiation fin is connecting to the internal GND of the package.

Connect the fin to the external GND.

8

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