Motor driver for CD-ROMs

BA6665FMOptical disc ICs

Motor driver for CD-ROMsBA6665FM

The BA6665FM is a CD-ROM spindle motor driver supporting reverse-rotation preventing circuit. It incorporates powersave circuit, thermal shut down circuit, FG output, hall bias, etc. The 3-phasefall-wave pseudo linear driving systemachieves high-performance and multi-function.

ApplicationsCD-ROM / RW, DVD-ROM

Features1) 3-phase, full-wave pseudo linear driving system2) Built in power save3) Built in thermal shut down circuit4) Built in current limit circuit5) Built in Hall Bias circuit6) Built in FG-output ( 3 phase parallel output )7) With switching function of regular / reverse rotations

Absolute maximum ratings (Ta=25°C)

Parameter Symbol Limits Unit

Supply voltage VCC

IOUT

7 V

VSupply voltage VM 15

2200∗ 1 mWPower dissipation Pd

Topr −20~+75

˚C

˚C

Strage.temp.range

1300∗ 2

150

mA

Operate.temp.range

Maximum o.current

Juncition temp.

Tstg

Tjmax

−55~+150

˚C

∗ 1 Derating in done at 17.6mW / ˚C for operating above Ta=25˚C.70mm×70mm×1.6mm glass epoxy board.

∗ 2 Do not, however exceed Pd, ASO and Tj=150˚C.

Recommended operating conditions (Ta=25°C)

Parameter

Operating supply voltagerange

VCC 4.5 5.5−

VM 3.0 14.0V

−

Symbol Min. Typ. Max. Unit


Block diagram

FIN

3

28

27

25

24

23

22

21

20

19

181.6kΩ

VCC(Typ.)

TORQUESENSE AMP

CURRENTSENSE AMP

VCC(Typ.)

VCC(Typ.)

1.6kΩ

1.6kΩ

FIN

17

16

5

7

8

9

10

11

12

13

14

DRIVER

TSD

Hall 1

Hall Bias

PS

REV

RNF

VM

VCC

SERVOSIGNAL

TL

GAINCONTROL

+−

+−

+ −

+−

+−

+−

+−

+−

Hall 2

Hall 3


Pin descriptions

Pin No. Function

N.C.

Pin Name

N.C.1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

FIN

N.C.N.C.

Output3 for motorA3

Output2 for motorA2

N.C.

Output1 for motor

Hall input Amp1. positive input

Hall input Amp1. negative input





Hall bias

Capacitor connection pin for phase compensation

Torque control standard voltage input terminal

Torque control voltage input terminal

Terminal connection for current sensing resistor

START / STOP switch

Reverse terminal

Power supply for signal division

Power supply for driver

N.C.

GND

FG3 signal output terminal



GND

N.C.

N.C.

N.C.

N.C.

GND

H1+

H1−

H2+

H2−

H3+

H3−

N.C.

FG3

FG2

FG1

VH

CNF

ECR

EC

REV

VCC

VM

RNF

FIN

N.C.

PS

A1


Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=5V, VM=12V)

Parameter Symbol Min. Typ. Max. Unit Conditions

Circuit current1

Circuit current2

ON voltage range

OFF voltage range

Hall bias voltage

Input bias current

Minimum input level

Input voltage range

Offset voltage −

H3 hysteresis level

In−phase input voltage range

ICC1

ICC2

VPSON

VPSOFF

VHB

IHA

VHAR

VINH

VHYS

−

2.5

0.5

1.5

0.9 1.5

0.7 3.0

4.0

0

4.7

0.2

− 7.1

−−−

−−

50

10

0 5

20 40

−

−−70 −40 −10

−

−1.0

mA

V

V

V

V

µA

mA

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

Test Circuit

At power save OFF

IHB=10mA

TOTAL

POWER SAVE

HALL BIAS

HALL AMP

TORQUE CONTROL

FG

OUTPUT

REVERSE

At power save ON

mVpp

mV

mV

EC , ECR

ECOFF −V EC , ECR=0.5V~3.3V

EC=ECR=1.65V

ECR=1.65V

Offset voltage +Input current

Input−output Gain

10 40

0.5

0.56

4.5 4.9 5.0

0.7 0.84

2.0

70 mVECOFF + ECR=1.65V

ECIN

GEC

VFGH

VFGL

VOH

− µA

A / VEC=1.3 , 1.5V 1.8 , 2.0VRNF=0.5Ω

FG output voltage H

FG output voltage L

V

V

V

V

IFG=−20µA

IFG=3mA

IO=−600mA

IO=600mA

RNF=0.5Ω

0 0.25

1.0 1.5

0.4

Saturation voltage H

Saturation voltage L

−VOL

IVMP

VRSON

VRSOFF

ITL

0.4

35

560

2.5

700 840

1.0

70

0.8−−

− −− −

Pre−drive current

Torque limit current

ON voltage range

OFF voltage range

mA

mA

EC=5V output open

V

V


Measurement circuit

A2

V2

A1

Fig.1 )Circuit current

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]

Test CircuitHall bias voltage

12V

RNF

5V5V

1.65V

RL

H1+ H2+ H3+

H1− H2− H3−

IHB

V1

Fig.2 )PS ON/OFF rangeREV ON/OFF range

VPSON : Range of 'VPS' that output pinsbecome input-output table.

(Input condition 1~6)

VPSOFF : Range of 'VPS' that output pinsbecome open.

(Input condition 1~6)

VRSON : Range of 'VREV' that output pinsbecome input-output table.

(Input condition 1~6)VPS=5 [V] EC=0 [V]

VRSOFF : Range of 'VREV' that output pinsbecome open.


ITL : (Value of 'V1') / 0.5


Test CircuitTorque limit current

12V

RNF

VPS

ECVREV

5V 1.65V

RL

H1+ H2+ H3+

H1− H2− H3−


Pin No.

Input conditions

Input-output table

Output

Regular Reverse

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 = 2.6VMid = 2.5VLow = 2.4V

Reverse EC<ECR REV = L,

7pin HI

Test point(Regular)

7pin Low

5pin HI

5pin Low

3pin HI

3pin Low

L

9

H

M

M

H

L

H1+

M

10

M

M

M

M

M

H1−

H

11

L

L

H

M

M

H2+

M

12

M

M

M

M

M

H2−

M

13

M

H

L

L

H

H3+

M

14

M

M

M

M

M

H3−

H

7

L

L

H

L

H

A1

L

5

H

H

L

L

H

A2

L

3

H

L

H

H

L

A3

L

7

H

H

L

H

L

A1

H

5

L

L

H

H

L

A2

H

3

L

H

L

L

H

A3

A

12V

5V1.65V

RL

RNF

H1+ H2+ H3+

H1− H2− H3−

A A A A A

Fig.3 )Input bias currentIn-phase input voltage range Test CircuitHall minimum input level

IHA : Value of 'A1' (Hn+=4.0V, Hn−=2.5V)Value of 'A2' (Hn+=2.5V, Hn−=4.0V)

n=1, 2, 3

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)


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'.

12V

RNF

5V1.65V

H1+ H2+ H3+

H1− H2− H3−

600mA

3, 5, 7pin

VM

VOH

600mA

3, 5, 7pin

GND

VOL

Fig.4 )Output saturation voltage H Test CircuitOutput saturation voltage L

V

EC : Torque control operating. range.

ECIN : Value of 'A' at EC=ECR=2.5VGEC : Value of 'V' at EC=1.3V→V1

Value of 'V' at EC=1.5V→V2Value of 'V' at EC=1.8V→V3Value of 'V' at EC=2.0V→V4

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

GEC=(V1−V2) / (1.5−1.3) / RNFGEC=(V4−V3) / (2.0−1.8) / RNFRNF=0.5Ω

value of 'V' become 3mV.

12V

RNF

EC5V 1.65V

RL

H1+ H2+ H3+

H1− H2− H3−

A

Fig.5 )Torque offset voltage Test CircuitInput-output gain


VHYS : Difference Hn+ from Hn− that

IVMp : value of 'A'

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

VFGL : Value of 'FG-OUTPUT-VOLTAGE'

at IFG=3mA (Hn+=L)

VFGH : Value of 'FG-OUTPUT-VOLTAGE'

at IFG=−20µA (Hn+=H)

Output open

EC=ECR=1.65V

EC=5V, ECR=2.5V(Input condition 1~6)

12V

EC5V 1.65V

RL

H1+ H2+ H3+

H1− H2− H3−

A

VL IFG

RNF

Fig.6 )Hall hysteresis level Pre-drive current FG output voltage H Test Circuit

FG output voltage L

Electrical characteristic curves

0 1 2 3 4 5 6 7

5

7.5

2.5

CIR

CU

IT C

UR

RE

NT

: IC

C (

mA

)

SUPPLY VOLTAGE : VCC (V)

Fig.7 Circuit Current

0 1 2 3 4 5

5

1

2

3

4

8

9

6

7

CIR

CU

IT C

UR

RE

NT

: IC

C (

mA

)

PS VOLTAGE : VPS (V)

Fig.8 PS Threshold voltage

0 10 20 30 40 50 60 70 80 90 100

5

1

2

3

4

HA

LL B

IAS

VO

LTA

GE

: V

H (

V)

HALL BIAS CURRENT : IVH (mA)

Fig.9 Hall Bias voltage

−50 −40 −30 −20 −10 0 10 20 30 40 50

5

1

2

3

4

8

9

6

7

FG

3 V

OLT

AG

E :

VF

G3

(V)

H3 HYSTERESIS VOLTAGE ; H3+−H3

− (mV)

Fig.10 H3 Hysteresis Level

−50 0 +50

10

20

TO

RQ

UE

LIM

IT C

UR

RE

NT

(m

A)

OFFSET VOLTAGE ; EC−ECR (mV)

EC−ECR (mV)

ITL (mA)

Fig.11 Torque Control Offset voltage

0 1 2 3 4 5

500

100

200

300

400

800

900

600

700

TO

RQ

UE

LIM

IT C

UR

RE

NT

: IT

L

TORQUE VOLTAGE : EC (V)

Fig.12 Torque Limit Current


1.0 2.0OU

TP

UT

SA

TU

RA

TIO

N V

OLT

AG

E L

OW

: V

OL

(V)

OUTPUT CURRENT : IO (A)

Fig.14 Output Saturation voltage Low

1.0

2.0

1.0 2.0

1.0 2.0

OU

TP

UT

SA

TU

RA

TIO

N V

OLT

AG

E H

IGH

: V

OH (

V)

OUTPUT CURRENT : IO (A)

Fig.13 Output Saturation voltage HI

1.0

2.0

10 20 30

PR

E-D

RIV

E C

UR

RE

NT

: IV

M (

mA

)

VM SUPPLY VOLTAGE : VM (V)

Fig.15 Predrive Current

50

100

External dimensions (Units : mm)

HSOP-M28

18.5 ± 0.2

7.5

± 0

.2

9.9

± 0

.3

28 15

1 14

2.2

± 0.

1

0.35 ± 0.1

5.15 ± 0.1

0.3Min.0.8

0.25

± 0

.1

0.15

0.11

Appendix

Appendix1-Rev1.0

The products listed in this document are designed to be used with ordinary electronic equipment or devices

(such as audio visual equipment, office-automation equipment, communications devices, electrical

appliances and electronic toys).

Should you intend to use these products with equipment or devices which require an extremely high level of

reliability and the malfunction of with would directly endanger human life (such as medical instruments,

transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other

safety devices), please be sure to consult with our sales representative in advance.

NotesNo technical content pages of this document may be reproduced in any form or transmitted by any

means without prior permission of ROHM CO.,LTD.

The contents described herein are subject to change without notice. The specifications for the

product described in this document are for reference only. Upon actual use, therefore, please request

that specifications to be separately delivered.

Application circuit diagrams and circuit constants contained herein are shown as examples of standard

use and operation. Please pay careful attention to the peripheral conditions when designing circuits

and deciding upon circuit constants in the set.

Any data, including, but not limited to application circuit diagrams information, described herein

are intended only as illustrations of such devices and not as the specifications for such devices. ROHM

CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any

third party's intellectual property rights or other proprietary rights, and further, assumes no liability of

whatsoever nature in the event of any such infringement, or arising from or connected with or related

to the use of such devices.

Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or

otherwise dispose of the same, no express or implied right or license to practice or commercially

exploit any intellectual property rights or other proprietary rights owned or controlled by

ROHM CO., LTD. is granted to any such buyer.

Products listed in this document use silicon as a basic material.

Products listed in this document are no antiradiation design.

About Export Control Order in Japan

Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade ControlOrder in Japan.In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.

Motor driver for CD-ROMs

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