KA9259D 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA9259D

5-Channel Motor Driver

Fairchild Semiconductor 

KA9259D

• The VREF BG is the output voltage of the band-gap-referenced biasing circuit and is the reference voltage of the regulator.

• The external circuit is composed of the transistor, KSB772 and a capacitor, 100µF, and the capacitor is used as a ripple

eliminator and should have a good temperature characteristics.

• The output voltage, VOUT is decided as follows.

VOUT = VREF BG × 2 = 2.5 × 2 = 5V (R2 = R3)

R2 = R3

4. LOADING MOTOR DRIVER

20

I

+∆V

+ Buffer

COMP

R

−

9

+

VREF1

14

−

I

−∆V

R

VREF1

Buffer

+

−

Q1 −∆V

M

15

Q3

+∆V Q2

16

Q4

• The input voltages of (5V and 0V) or (0V and 5V) pairs are applied to the input pin #9 and #14 respectively.

• When the input voltages are applied to the input pin #9 and #14, then the output of the comparator is depends on the input

voltage status.

• As shown in the above diagram, the difference ∆V, [VREF1 + (I × R)] - [VREF1 -(I × R)], is applied to the both terminals of

the motor. The direction of the motor is decided by the voltage difference, +∆V and −∆V.

• The output characteristics is as follows,

- If pin # 9=5V and #14=0V, then pin # 15=+∆V and #16= −∆V, hence the motor turn in forward direction.

- If pin # 9=0V and #14=5V, then pin # 15= −∆V and #16=+∆V, hence the motor turn in reverse direction.

- If pin # 9=5V and #14=5V, then ∆V=0V, hence the motor stop.

- If pin # 9=0V and #14=0V, then ∆V=0V, hence the motor stop.

• When the rotation speed control of the loading motor is desired, refer to the circuit below.

5. LOADING MOTOR SPEED CONTROL

VCC (8V)

4V

VCC

50k

R

20

50k

VCC (8V)

4V

VCC

50k

R

20

50k

D

• If the torque of the loading motor is too low when it is used with the pin #20 open, then it should be used as in 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).

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