Datasheet BA6665FM Datasheet (ROHM)

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.

z

zApplications

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CD-ROM / R W, D VD-ROM

z

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

z

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.

zzzz

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

z

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

Optical disc ICs

z

zElectrical characteristics (unless otherwise noted, T a=25°C, VCC=5V , VM=12V)

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BA6665FM

Parameter Symbol Min.

TOTAL

Circuit current1
Circuit current2

POWER SAVE

ON voltage range
OFF voltage range

HALL BIAS

Hall bias voltage

HALL AMP

Input bias current
In−phase input voltage range
Minimum input level
H

hysteresis level

3

TORQUE CONTROL

Input voltage range
Offset voltage −
Offset voltage +
Input current

Input−output Gain

FG

FG output voltage H
FG output voltage L

OUTPUT

Saturation voltage H
Saturation voltage L
Pre−drive current
Torque limit current

REVERSE
ON voltage range
OFF voltage range

Max. Unit Conditions

Typ.

CC

1

E

E
E

V

V

V

V

C

COFF
COFF

V
V

V

V

I

CC

I

PSON

PSOFF

V

HB

I

HA
HAR

V

INH
HYS

, E

E

CIN

G

EC

FGH
FGL

V

OH

V

OL

I

VMP

I

TL

RSON

RSOFF

−

2

−

2.5

0.5

−

1.5
50
10

05

CR

−70 −40 −10

−
10 40

+ ECR=1.65V

−µA

0.56

4.5 4.9 5.0
0 0.25

−

−

−

560

2.5

−−

0.2

0

7.1

4.7

−

−

1.0

−−

0.9 1.5

0.7 3.0

4.0

−

−

−

20 40

−

70 mV

0.5

2.0

0.7 0.84

0.4

1.0 1.5

0.4

0.8

35

70

700 840

−−

1.0

mA
mA

V
V

V

µA

V

mVpp

mV

V

mV

A / V

V
V

V

V
mA
mA

V

V

At power save ON
At power save OFF

I

HB

=10mA

C

, ECR=0.5V~3.3V

E
E

CR

=1.65V

E

C=ECR

=1.65V

C

=1.3 , 1.5V 1.8 , 2.0V

E
RNF=0.5Ω

I

FG

=−20µA

FG

=3mA

I

I

O

=−600mA

O

=600mA

I

C

=5V output open

E

NF

=0.5Ω

R

Test Circuit

Fig.1
Fig.1

Fig.2
Fig.2

Fig.3
Fig.3
Fig.3
Fig.6

Fig.5
Fig.5

Fig.5

Fig.6
Fig.6

Fig.4
Fig.4
Fig.6
Fig.2

Optical disc ICs

z

zMeasurement circuit

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5V

A1

12V

R

NF

A2

L

R

5V

1.65V

V2

I

HB

H1+ H2+ H3+

H1− H2− H3−

BA6665FM

ICC1 : Value of 'A1'

VPS=0 [V]
H1+~H3+=(1/2)×VCC+0.1 [V]
H1−~H3−=(1/2)×VCC [V]

ICC2 : Value of 'A1'

VPS=5 [V]
H1+~H3+=(1/2)×VCC+0.1 [V]
H1−~H3−=(1/2)×VCC [V]

VHB : Value of 'V2'

VPS=5 [V]
IHB=10 [mA]

V1

Circuit current

Fig.1

Hall bias voltage

5V

12V

NF

R

L

R

V

PS

V

REV

PS ON/OFF range
REV ON/OFF range

Fig.2

Torque limit current

E

C

Test Circuit

)

1.65V

H1+ H2+ H3+

Test Circuit

)

H1− H2− H3−

VPSON : Range of 'VPS' that output pins

become input-output table.

(Input condition 1~6)

VPSOFF : Range of 'VPS' that output pins

become open.

(Input condition 1~6)

VRSON : Range of 'VREV' that output pins

become input-output table.

(Input condition 1~6)

VPS=5 [V] EC=0 [V]

VRSOFF : Range of 'VREV' that output pins

become open.

(Input condition 1~6)

VPS=5 [V] EC=0 [V]

ITL : (Value of 'V1') / 0.5

VPS=5 [V] EC=0 [V]

(Input condition 1~6)

Optical disc ICs

Input-output table

Input conditions

Pin No.

Condition 1
Condition 2
Condition 3
Condition 4
Condition 5

Condition 6
Cautions 1 : Regular EC<ECR REV = L, EC>ECR REV=H

Input voltage : Hi = 2.6V

9

10

11

12

13

H1+

H1−

H2+

H2−

H3+

L

M

H

M

M

H

M

L

M

M

M

M

L

M

H

M

M

H

M

L

H

M

M

M

L

L

M

M

M

H

Reverse EC<ECR REV = L,

Mid = 2.5V
Low = 2.4V

Regular Reverse

14

7

H3−

A1

A2

M

H

M

L

M

L

M

H

M

L

M

H

BA6665FM

Output

Test point

5

3

7

5

A3

A1

A2

L

L

L

H

H

H

H

L

H

L

H

L

L

H

L

H

L

H

H

H

H

L

L

L

3

A3

H
L
H
L
L
H

(Regular)

7pin HI
7pin Low
5pin HI
5pin Low
3pin HI
3pin Low

12V

5V

R

NF

L

R

Fig.3

1.65V

A

H1+ H2+ H3+

H1− H2− H3−

Input bias current
In-phase input voltage range
Hall minimum input level

A A A A A

Test Circuit

)

IHA : Value of 'A1' (Hn+=4.0V, Hn−=2.5V)

Value of 'A2' (Hn+=2.5V, Hn−=4.0V)

VHAR : Hall voltage range that output pins
become input-output table.

VINH : Hall input level that output pins

become input-output table.

Hn+−Hn− Hn−=2.5V (n=1, 2, 3)

n=1, 2, 3

Optical disc ICs

5V

12V

R

NF

BA6665FM

1.65V

VOH : In case output measurement pin='H'

by input condition and IO=−600mA,
value of 'VOH'. (VM-RNF short)

VOL : In case output measurement pin='L'

by input condition and IO=600mA,
value of 'VOL'.

H1+ H2+ H3+

H1− H2− H3−

3, 5, 7pin

V

NF

R

12V

600mA

V

OH

M

V

Output saturation voltage H

Fig.4

Output saturation voltage L

5V

R

L

600mA

3, 5, 7pin

V

OL

GND

Test Circuit

)

E

C

1.65V

A

EC : Torque control operating. range.

H1+ H2+ H3+

H1− H2− H3−

ECOFF+, ECOFF− : Offset voltage at ECR=1.65V that

ECIN : Value of 'A' at EC=ECR=2.5V
GEC

: Value of 'V' at EC=1.3V→V1

Value of 'V' at EC=1.5V→V2
Value of 'V' at EC=1.8V→V3
Value of 'V' at EC=2.0V→V4

GEC={(V1−V2) / (1.5−1.3)} / RNF
GEC={(V4−V3) / (2.0−1.8)} / RNF
RNF=0.5Ω

value of 'V' become 3mV.

Torque offset voltage

Fig.5

Input-output gain

Test Circuit

)

Optical disc ICs

A

12V

5V

R

NF

R

L

Hall hysteresis level
Pre-drive current

Fig.6

FG output voltage H
FG output voltage L

BA6665FM

VL

I

FG

E

C

1.65V

H1+ H2+ H3+

H1− H2− H3−

Test Circuit

)

VHYS : Difference Hn+ from Hn− that

FG1 / FG2 / FG3 voltage change. (n=1, 2, 3)

EC=ECR=1.65V

IVMp : value of 'A'

Output open
(Input condition 1~6)

EC=5V, ECR=2.5V

VFGL : Value of 'FG-OUTPUT-VOLTAGE'

at IFG=3mA (Hn+=L)

VFGH : Value of 'FG-OUTPUT-VOLTAGE'

at IFG=−20µA (Hn+=H)

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Electrical characteristic curves

7.5

(mA)

CC

5

2.5

CIRCUIT CURRENT : I

01234567

SUPPLY VOLTAGE : VCC (V)

Fig.7 Circuit Current

9
8
7
6
5
4
3

FG3 VOLTAGE : VFG3 (V)

2
1

−50 −40 −30−20 −10 0 10 20 30 40 50
H3 HYSTERESIS VOLTAGE ; H3+−H3− (mV)

Fig.10 H3 Hysteresis Level

5

9
8

(mA)

7

CC

6
5
4
3
2

CIRCUIT CURRENT : I

1

012345

PS VOLTAGE : VPS (V)

Fig.8 PS Threshold voltage

TL

(mA)

I

20

10

TORQUE LIMIT CURRENT (mA)

−50 0 +50
OFFSET VOLTAGE ; EC−ECR (mV)

Fig.11 Torque Control Offset voltage

EC−ECR (mV)

4

(V)

H

3

2

1

HALL BIAS VOLTAGE : V

0102030405060708090100

HALL BIAS CURRENT : IVH (mA)

Fig.9 Hall Bias voltage

900

TL

800
700
600
500
400
300
200

TORQUE LIMIT CURRENT : I

100

012345

TORQUE VOLTAGE : EC (V)

Fig.12 Torque Limit Current

Optical disc ICs

(V)

OL

2.0

: V

OW

1.0

(V)

OH

1.0

OUTPUT CURRENT : IO (A)

1.0 2.0

(mA)

VM

100

BA6665FM

50

OUTPUT SATURATION VOLTAGE L

1.0 2.0

OUTPUT CURRENT : IO (A)

Fig.14 Output Saturation voltage Low

z

zExternal dimensions (Units : mm)

zz

18.5 ± 0.2

28 15

9.9 ± 0.3

7.5 ± 0.2

114

5.15 ± 0.1

0.35 ± 0.1

0.8

0.11

2.2 ± 0.1

HSOP-M28

0.3Min.

2.0

OUTPUT SATURATION VOLTAGE HIGH : V

Fig.13 Output Saturation voltage HI

0.25 ± 0.1

0.15

1.0 2.0

PRE-DRIVE CURRENT : I

10 20 30

VM SUPPLY VOLTAGE : VM (V)

Fig.15 Predrive Current