KA3021D Просмотр технического описания (PDF) - Fairchild Semiconductor

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KA3021D

4-Channel Motor Driver

Fairchild Semiconductor 

KA3021D

3. FOCUS, TRACKING ACTUATOR, SLED MOTOR DRIVE PART

M

Power amp

R4

AP2

Vr

R3

AP3

R4

R3

−

LEVEL

+

SHIFT

AP1

R2

23

−

Vref

4 24

R1

3 20 25

• The reference voltage REF is given externally through pin 23.

• The input signal,pin3,20.25 is amplified by R2 / R1 times and then fed to the level shift circuit.

• The level shift circuit produces the differential output voltages and drives the two output power amplifiers. Since the

differential gain of the output amplifiers is equal to 2 × (1+ R4 / R3), input signal is amplified by (R2 / R1) × 2 × (1 + R4 /

R3).

• If the total gain is insufficient, the external resistors can be used through pin 4, 24 to increase the gain.

• The bias voltage (Vref) is about a half of the supply voltage(VM).

4. TRAY MOTOR DRIVE PART

DO2+

M

12

DO2−

13

D

D

LEVEL SHIFT

CTL

M.S.C

19

S.W

IN

FWD

16

IN

REV

15

9

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