Fairchild KA3012D service manual

KA3012D

4-Channel Motor Driver

www.fairchildsemi.com

Features

• BTL (H-Bridge type linear) 4channel motor driver

• Wide dynamic range:

-SV

-SV

• Built in level-shift circuit

• Built in OP-amp for digital input

• Built in thermal shutdown (TSD) circuit

• Three independent sources

• Low crossover distortion

• Built-in reverse rotation prevented

• Built-in short breaker

=12V, PV

CC

=12V, PV

CC

=5V, RL=8Ω → VOM=4.2V

CC1

=12V, RL=24Ω → VOM=10.4V

CC2

Description

The KA3012D is a monolithic IC, and suitable for 4-CH
motor driver which drives sled motor, loading motor, focus
& tracking actuator of CD-media system and built in OP­amp which can receive digital signal from servo of CD­media system.

28-SSOPH-375

Typical Applications

• Compact disk R O M (CD-ROM)

• Compact disk RW (CD-RW)

• Digital video disk ROM (DVD-ROM)

• Digital video disk RAM (DVD-RAM)

• Digital video disk player (DVDP)

• Other compact disk media

©2000 Fairchild Semiconductor International

Ordering Information

Device Package Operating Temp.

KA3012D-02 28-SSOPH-375 -35 °C ~ 85 °C

KA3012D-02TF 28-SSOPH-375 -35 °C ~ 85 °C

Rev. 1.0.1

February. 2000.

1

Pin Assignments

GND

CH4-O

1234567 891011121314

CH1-O

CH1-O

KA3012D

FIN

CH4-O

AMP4-O

AMP4-I (−)

AMP4-I (+)

PVCC1

(GND)

PVCC2

AMP3-I (+)

AMP3-O

AMP3-I (−)

CH3-O

CH3-O

GND

1516171819202122232425262728

KA3012D

FIN

SVCC

(GND)

BIAS

AMP1-O

AMP1-I (−)

AMP1-I (+)

GND

MUTE

CH2-O

AMP2-O

AMP2-I (−)

AMP2-I (+)

CH2-O

2

KA3012D

Pin Definitions

Pin Number Pin Name I/O Pin Function Description

1 CH1-O O Drive CH 1 output (−)
2 CH1-O O Drive CH 1 output (+)
3 AMP1-O O Op-amp CH 1 output
4AMP1-I(−) I Op-amp CH 1 input (−)
5 AMP1-I(+) I OP-amp CH 1 input (+)
6 BIAS I Bias input
7 SVCC - Supply voltage (Signal)
8 GND - Ground

9MUTEIMute
10 AMP2-I(+) I OP-amp CH 2 input (+)
11 AMP2-I(−) I Op-amp CH 2 input (−)
12 AMP2-O O Op-amp CH 2 output
13 AMP2-O O OP-amp CH 2 output (+)
14 CH2-O O Op-amp CH 2 output

(Op-amp CH 2 output)
15 GND - Ground
16 CH3-O O Drive CH 3 output (−)
17 CH3-O O Drive CH 3 output (+)
18 AMP3-O O OP-amp CH 3 output
19 AMP3-I(−) I Drive CH 3 input (−)
20 AMP3-I(+) I Drive CH 3 input (+)
21 PVCC2 - Supply voltage (CH 2 & CH 3)
22 PVCC1 - Supply voltage (CH1 & CH 4)
23 AMP4-I(+) I OP-amp CH 4 input (+)
24 AMP4-I(−) I Op-amp CH 4 input (−)
25 AMP4-O O Op-amp CH 4 output
26 CH4-O O Drive CH 4 output (+)
27 CH4-O O Drive CH 4 output (−)
28 GND - Ground

3

Internal Block Diagram

KA3012D

PVCC1

AMP4-I (+)

AMP4-I (−)

+

10k10k

AMP4-O

CH4-O

PV

10k

BIAS

CC1

+

−

SV

SVCC

−

PV

+

AMP1-O

10k10k

CC1

AMP1-I (−)

− +

−

+

10k

/2

−

+

+

−

10k

10k

AMP1-I (+)

CH4-O

GND

10k 10k

GND

PV

CC1

PV

CC1

10k 10k

1234567 891011121314

CH1-O

+−+

/2

−

LEVEL-SHIFT

LEVEL-SHIFT

−

/2

−−

++

CH1-O

NOTE:

The drive channel outputs are determined pre OP-amp output.

GND

TSD

CC

GND

PV

GND

PVCC2

CC2

GND

AMP3-I (+)

10k

−

+

10k

MUTE

+

20k

20k

MUTE

AMP3-I (−)

10k 10k

++

PV

CC2

+

−

AMP2-I (−)

AMP2-I (+)

−−

/2

+

LEVEL-SHIFT

LEVEL-SHIFT

+

PV

/2

CC2

10k

−

10k

AMP2-O

−

+

−

10k10k

PV

−

−

PV

++

CH2-O

1516171819202122232425262728

GND

CC2

CC2

−

/2

/2

10k10k

CH2-O

GND

CH3-O

CH3-O

AMP3-O

4