FAN8001 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8001

5-Channel Motor Driver

Fairchild Semiconductor 

5. LOADING MOTOR SPEED CONTROL

VCC (8V)

4V

VCC

50k

R

20

50k

VCC (8V)

4V

FAN8001D

VCC

50k

R

20

50k

D

• If the torque of the loading motor is too low with the pin #20 open, then use it as the above diagram.

• The desired torque could be obtained by selecting the appropriate resistor R as shown in the left diagram.

• If it is necessary, the zener diode can be used as in the right diagram.

• The maximum torque is obtained when the applied voltage at pin #20 is about 6.8V (at VCC=8V).

6. DRIVER (EXCEPT FOR LOADING MOTOR DRIVER)

3 10

19 25

4 24

VREF

(2.5V)

10k

100k

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 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, the motor rotates forward direction.

• When the input voltage through the pin #3 is above the VREF, the motor rotates reverse direction.

• If it is desired to change the gain, then the pin #4 or #24 can be used.

9

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