KA3012D02 データシートの表示（PDF） - Fairchild Semiconductor

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KA3012D02

4-Channel Motor Driver

Fairchild Semiconductor 

KA3012D

3. DRIVER

BIAS

(6 Pin)

AMP-I (+)

Pre-amp

+

(5, 10, 20, 23 Pin)

AMP-I (−)

−

10k

(4, 11, 19, 24 Pin)

AMP-O

(3, 12, 18, 25 Pin)

AMP

+

Level

−

shift

10k

+∆I

+

Buffer

−

−∆I

Buffer

+

−

Q1 −∆V

M

+∆V Q2

CH-O

(1, 14,

Q3 16, 27 Pin)

CH-O

(2, 13,

17, 26 Pin) Q4

• The gain of pre-op. Amplifier can be changed by manipulating amp input resistor or feedback resistor.

• The voltage, VREF, is the reference voltage given by the bias voltage of the pin #6.

• The level shift produces the current due to the difference between the pre amp output signal and the arbitrary reference

(bias) signal. (The current produced as +∆I and −∆I is fed into the driver buffer. (CH1/CH4)

The current produced as +2∆I and −2∆I is fed into the driver buffer. (CH2/CH3)

• Driver buffer drives 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 output voltage of Pre-Amp (Pin 3, 12, 18, 25) is below the VREF, then the direction of the motor is in forward.

• When the output voltage of Pre-Amp (Pin 3, 12, 18, 25) is above the VREF, then the direction of the motor in reverse.

• The gain (AV) of the drive circuit is as follows.

AV

=

20 log

4----V----I--N--

VIN

= 12(dB)

(CH1/CH4)

AV

=

20 log

4----V----I--N--

VIN

= 18(dB)

(CH1/CH4)

4. CONNECT A BY-PASS CAPACITOR, 0.1µF BETWEEN THE SUPPLY VOLTAGE SOURCE.

VCC1 7

104

5. RADIATION FIN IS CONNECTING TO THE INTERNAL GND OF THE PACKAGE.

CONNECT THE FIN TO THE EXTERNAL GND.

9

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