KA9258CDTF 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA9258CDTF

4-Channel Motor Driver

Fairchild Semiconductor 

KA9258D(KA9258CD)

4. Balanced Transformerless(BTL) Driver

VREF

23

3

10K

10K

4

∆I

Buffer

Level

Shift

∆I

Buffer

BTL Driver

22

Q1

Q2

2

M

1

Q3

Q4

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• 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 transistor 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 transistor Q1 and Q4. On the

other hand, if transistor Q2 and Q3 is operating, the motor is rotating in reverse direction

• When the input voltage through the pin #3 is below the VREF, then the direction of the motor in forward direction.

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

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

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

VCC2

22

21 VCC1

0.1uF

KA9258D

FIN

FIN

• Radiation FIN is connecting to the internal GND of the package.

Connect the FIN to the external GND.

10

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