ROHM BA6665FM Datasheet

BA6665FM

Optical disc ICs

Motor driver for CD -ROMs

BA6665FM

The BA6665FM is a CD-ROM s pindle motor driv er suppo rting revers e-rota tion p reventing circuit. It i ncorpor ates po wer
save circuit, th ermal shut down circuit, FG output , hall bias, etc. The 3-phasef all-wave pseudo linear driving s ystem
achieves high-performance and multi-function.

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zApplications

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CD-ROM / R W, D VD-ROM

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zFeatures

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1) 3-phase, full-wave pseudo linear driving system

2) Built in power save

3) Built in thermal shut down circuit

4) Built in current limit circuit

5) Built in Hall Bias circuit

6) Built in FG-output ( 3 phase parallel output )

7) With switching function of regular / reverse rotations

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zAbsolute maximum ratings (Ta=25°C)

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Parameter Symbol Limits Unit

V

Supply voltage
Supply voltage V
Power dissipation Pd
Operate.temp.range
Strage.temp.range

Juncition temp.
Maximum o.current

70mm×70mm×1.6mm glass epoxy board.

∗1 Derating in done at 17.6mW / ˚C for operating above Ta=25˚C.
∗2 Do not, however exceed Pd, ASO and Tj=150˚C.

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Recommended operating conditions

Parameter

Operating supply voltage
range

CC

M

Topr −20~+75
Tstg

Tjmax

I

OUT

(Ta=25°C)

Symbol Min. Typ. Max. Unit

CC

V

V

M

4.5 5.5−

3.0 14.0

7V

15

1

∗

2200

−55~+150
150

2

∗

1300

−

V

mW

˚C
˚C
˚C

mA

V

Optical disc ICs

z

zBlock diagram

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BA6665FM

Hall 1

Hall 2

Hall 3

FIN

10

11

12

13

14

DRIVER

R

NF

27

28

3

GAIN

5

CONTROL

7

TSD

+

CURRENT

SENSE AMP

25

V

−

REV

24

CC

23

V

M

PS

8

9

+

−

+

−

TL

TORQUE

SENSE AMP

+

−

22

21

SERVO
SIGNAL

20

+

−

+

−

+

−

+

−

1.6kΩ

1.6kΩ

1.6kΩ

Hall Bias

VCC

(Typ.)

VCC

(Typ.)

VCC

(Typ.)

19

18

17

16

FIN

Optical disc ICs

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zPin descriptions

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BA6665FM

Pin No. Function

10
11
12
13
14
15
16

17
18
19
20
21
22
23
24
25
26
27
28

FIN

Pin Name

N.C.1
2
3
4
5
6
7
8
9

N.C.

A

N.C.

A

N.C.

A

GND

1

H
H

1

H

2

H

2

H

3

H

3

3

2

1

+

−

+

−

+

−

N.C.

FG3

FG2

FG1

H

V

C

NF

E

CR

E

C

PS
R

EV

V

CC

N.C.

V

M

R

NF

FIN

N.C.
N.C.
Output3 for motor
N.C.
Output2 for motor
N.C.
Output1 for motor

GND
Hall input Amp1. positive input
Hall input Amp1. negative input
Hall input Amp2. positive input
Hall input Amp2. negative input
Hall input Amp3. positive input
Hall input Amp3. negative input
N.C.

FG3 signal output terminal
FG2 signal output terminal
FG1 signal output terminal
Hall bias
Capacitor connection pin for phase compensation
Torque control standard voltage input terminal
Torque control voltage input terminal
START / STOP switch
Reverse terminal
Power supply for signal division
N.C.
Power supply for driver
Terminal connection for current sensing resistor

GND