KA3031 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA3031

6-Channel Motor Drive IC

Fairchild Semiconductor 

5. FOCUS, TRACKING ACTUATOR, SPINDLE, SLED MOTOR DRIVE PART

KA3031

M

Rfeed2

AP2

-

Vr

Rref2 IC

AP3

Rfeed2

Rref2

−

LEVEL

+

SHIFT

AP1

Rfeed1

45

−

Vref

Rref1

2 5 8 11

BF

Vin

3 6 9 48

1 4 7 10

• The voltage, Vref is the reference voltage given by the external bias voltage of the pin 45.

• The input signal (Vin) through pins 3, 6, 9 and 48 is amplified one times (Rref1 = Rfeed1) by the AP1 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 are fed into the output amplifier, where output amplifier (AP2, 3) gain is two times (all

Rref2 = Rfeed2).

• If you desire to change the gain, the input buffer amplifier (BF) can be used.

• The output stage is the balanced transformerless (BTL) driver.

• The bias voltage Vr is expressed as below;

Vr

=

V-----C---C-----–-----V----B----E-

2

[

V]

15

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