KA9259HDTF 데이터 시트보기 (PDF) - Fairchild Semiconductor
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KA9259HDTF Datasheet PDF : 16 Pages
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KA9259D(KA9259HD)
• The VREFBG 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(PNP), KSB772 and a capacitor(C1), 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
= (1+
R2
R3 )VREFBG
=
2× 2.5 = 5[V ]
Where, R2 = R3
4. Loading Motor Driver
4.1 Truth table and Operation
INPUT
PIN9(DI5.1) PIN14(DI5.2)
L
L
H
L
L
H
H
H
PIN15(DO5.1)
L
H
L
L
OUTPUT
PIN16 (DO5.2)
L
L
H
L
State
Brake
Forward
Reverse
Brake
DI5.1
9
DI5.2 14
VCC
∆V
Input
Control
Logic
Speed
Control
Circuit
Level
Shift
∆V
R
20
D
Loading Motor Driver
Buffer
Buffer
21
Q1
Q2
15
M
16
Q3
Q4
13
• 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 voltage, ∆V, 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.
4.2 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.
• The maximum torque is obtained when the applied voltage at pin #20 is about 6.8V (at VCC=8V).
9
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