KA9259D(KA9259ED)

9

• The external circuit is composed of the transistor, KSB772 and a capacitor, 100

µF, and the capacitor is used as a ripple

eliminator and should have a good temperature characteristics.

R2 = R3

4. Loading Motor Driver

• 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 decided depends on the

input voltage status.

• As shown in the above diagram, the difference

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 follows.

5. Loading Motor Speed Control

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

+

−

+

−

Buffer

Buffer

Q1

Q3

M

Q2

Q4

−∆V+∆V

9

15

+

−

14

20

16

+

∆V

−∆V

COMP

R

I

I

R

20

20

4V

50k

R

D

R

50k

50k

50k

4V