Fairchild Semiconductor KA3084D Datasheet

KA3084D

2-Phase BLDC Motor Driver

www.fairchildsemi.com

Features

• Drives the BLDC motor using 2 hall sensors.

• 2-phase, full-wave drive method

• Built-in thermal shutdown (TSD) circuit

• Controls the motor speed through voltage

• Built-in bandgap circuit

• Built-in frequency Generator (FG) & Phase
Generator (PG) amplifier & comparato r.

Description

The KA3084D is a monolithic integrated circuit, and it is
suitable for drum motor driver of VCR system.

22-SOP-300

Target Applications

• Video cassette recorder(VCR) cylinder (drum) motor

• Other 2-phase BLDC motor

©2000 Fairchild Semiconductor International

Ordering Information

Device Package Operating Temp.

KA3084D 22-SOP-300 −25°C ~ +75°C

KA3084DTF 22-SOP-300 −25°C ~ +75°C

Rev. 1.0.1

February. 2000.

1

Pin Assignments

KA3084D

FGOUT

25

FGAMPOUT

V

ERG

FGIN

V

PGIN

PGAMPOUT

PGOUT

CTL

V

H2N

H2P

121314151622 21 20 19 18 17

KA3084D

1234567891011

CC2

V

OUT2P

GND(Signal)

GND2(Power)

OUT2N

OUT1P

OUT1N

GND1(Power)

CC1

V

H1P

H1N

Pin Definitions

Pine Number Pin Name I/O Pin Function Description

1 GND (Signal) - Ground (Signal)
2V

CC2

3 OUT2P O Output drive 2(P)
4 GND2 (Power) - Power ground 2
5 OUT2N O Output drive 2(N)
6 OUT1P O Power supply 1(P)
7 GND1 (Power) - Power ground 1
8 OUT1N O Output drive 1(N)
9V

CC1

10 H1P I Hall signal input 1P
11 H1N I Hall signal input 1N
12 H2P I Hall signal input 2P
13 H2N I Hall signal input 2N
14 V

CTL

15 PGOUT O Phase generator output
16 PGAMPOUT O Phase generator amp. output
17 PGIN I Phase generator input
18 V

REG

19 FGIN I Frequency generator input
20 V

25

21 FGAMPOUT O Frequency generator amp. output
22 FGOUT O Frequency generator output

- Power supply 2

- Power supply 1

I Voltage control (Motor speed control)

O Regurated voltage

I/O Reference voltage

2

KA3084D

Internal Block Diagram

FGOUT

FGAMPOUT

25

V

FGIN

REG

V

PGIN

PGAMPOUT

PGOUT

CTL

V

H2N

H2P

1214 131517 1618192022 21

25

HYS.

COM

V

DRIVER

REG

V

Supply each block

−

+

AMP

−

+

AMP

(5.0V)

TSD

DRIVER

CTL

I

HYS.

COM

CTL

V

Current/Voltage

Control

±

GM

GM
±

−

+

AMP

AMP

+

−

12 34567 8 91011

CC2

V

GND(Signal)

OUT2P

OUT2N

GND2(Signal)

OUT1P

OUT1N

GND1(Power)

CC1

V

H1P

H1N

3

Equivalent Circuits

Description Pin No. Internal circuit

V

CTL

Motor output 3, 5, 6, 8

14

V

REG

50

14

V

CC

1k

I

CTL

KA3084D

Hall input 10, 11, 12, 13

V

REG

3
6

50

10
12

500

I

CTL

Vcc

5
8

500

50

11
13

4

KA3084D

Equivalent Circuits (Continued)

Description Pin No. Internal circuit

PG, FG

amplifier

16, 17
19, 21

V

REG

PG, FG

hysteresis

amplifier

3, 5, 6, 8

10K

V

CC

50

16
21

V

CC

50

15
22

V

CC

50

17
19

V

REG

50

16
21

1k

V

CC

V

25

V

REG

V

25

5