Datasheet AN8481SB Datasheet (Panasonic)

ICs for Motor

AN8481SB

Spindle motor driver IC for optical disk

■ Overview

The AN8481SB is a high performance IC suited
for driving a spindle motor of an optical disk such
as CD-ROM, PD, DVD, CD-R, CD-RW, etc.

■ Features

• Adopting the 3-phase full-wave soft switch sys-

tem

• With switching regulator control function

• With start and stop pin

• Reverse breaking by EC/ECR voltage

• With Hall bias pin

• Surface-mount small package

■ Applications

• High speed CD-ROM drive

• PD, DVD, CD-R, CD-RW drives

18.4±0.2
(5.15)

28 22 21

17 814

(1.2)

(4.8)

(6.4)

0.8

+0.10

0.35

–0.05

Seating plane

15

8.3±0.22.7±0.20.1±0.1

HSOP042-P-0400

+0.10

10.93±0.30

Unit: mm

(1.315)

–0.05

0.30

0° to 10°

0.65±0.20

1

AN8481SB ICs for Motor

■ Block Diagram

REF

V

REG

PCS

SWB

SWG

GND

21

19

18

17

16

14

VM

20

Lower

side
V

CE

detection

Amp.

15

FC

CS1

22

Upper side

distribution

Triangular

wave

1

H1+

A1

27

26

Amp.

Amp.

Lower side
distribution

Direction changeover

Direction
detection

Hall amp. matrix

2

3

4

H1−

H2+

H2−

A2

25

Detection

5

A3

H3+

Logic

ER

EP = ER × EA

6

H3−

Hall
bias

7

VH

VTL

Absolute

value

EA

11

FG

9

FG

comparator

Start/stop

10

EC

PG

28

Thermal

protection

circuit

ECR

13

12

V

CC

PCI

8

S/S

■ Pin Descriptions

Pin No. Symbol Description

1H1+ Hall element-1 positive input pin
2H1− Hall element-1 negative input pin
3H2+ Hall element-2 positive input pin
4H2− Hall element-2 negative input pin
5H3+ Hall element-3 positive input pin
6H3− Hall element-3 negative input pin
7 VH Hall bias pin
8 SS Start/stop changeover pin
9 FG FG signal output pin

10 ECR Torque command reference input pin

2

Pin No. Symbol Description

11 EC Torque command input pin
12 PCI
13 V

Current feedback phase compensation pin
Supply voltage pin

CC

14 SG Signal GND pin
15 FC Triangular wave oscillation pin
16 SWG SW-REG system GND pin
17 SWB SW-REG driving pin
18 PCS
19 V

SW-REG system phase compensation pin
Fixed power supply pin

REG

20 VM Motor supply voltage pin

ICs for Motor AN8481SB

■ Pin Descriptions (continued)

Pin No. Symbol Description

21 REF SW-REG reference setting pin
22 CS1 Current det. pin 1
23 N.C. N.C.
24 N.C. N.C.

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V

4

Control signal input voltage

*

Supply current I

3

Output current

*

Hall bias current I

2

Power dissipation
Operating ambient temperature
Storage temperature

Note) Do not apply external currents or voltages to any pins not specifically mentioned.

For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.

1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.

*

2: For 70°C and IC alone.

*

3: n = 22, 25, 26, 27, 28

*

4: n = 1, 2, 3, 4, 5, 6, 8, 10, 11

*

*

1

*

1

*

CC

V

M

V

REG

V

(n)

CC

I

O(n)

HB

P

D

T

opr

T

stg

Pin No. Symbol Description

25 A3 Drive output 3
26 A2 Drive output 2
27 A1 Drive output 1
28 PG Power GND pin

7.0 V

14.4

0 to V

CC

30 mA

±1 200 mA

50 mA

667 mW

−20 to +70 °C

−55 to +150 °C

V

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

V

M

V

REG

■ Electrical Characteristics at Ta = 25°C

Parameter Symbol Conditions Min Typ Max Unit

Overall

Circuit current 1 I
Circuit current 2 I

Start/stop

Start voltage V

Stop voltage V

CC1

CC2

START

STOP

4.25 to 5.5 V

4.5 to 14

VCC = 5 V in power save mode  00.1mA
VCC = 5 V, IO = 0 mA  816mA

Voltage with which a circuit operates 3.5  V
at VCC = 5 V and L → H

Voltage with which a circuit becomes 1.0 V
off at VCC = 5 V and H → L

3

AN8481SB ICs for Motor

■ Electrical Characteristics at Ta = 25°C (continued)

Parameter Symbol Conditions Min Typ Max Unit

Hall bias

Hall bias voltage V

Hall amplifier

Input bias current I
In-phase input voltage range V
Minimum input level V

Torque command

In-phase input voltage range EC VCC = 5 V 1  3.9 V
Offset voltage EC
Dead zone EC
Input current EC
Input/output gain A

Output

High-level output saturation voltage V
Low-level output saturation voltage V
Torque limit current I

FG

FG output high-level FG
FG output low-level FG
In-phase input voltage range V

FG hysteresis width H

Triangular wave oscillation circuit

Charging current I
Discharging current I

Lower side voltage detection circuit

Input to output gain G

SW-REG driving circuit

PNP driving current I

VCC = 5 V, IHB = 20 mA 0.7 1.2 1.6 V

HB

VCC = 5 V  15µA

BH

VCC = 5 V 1.5  4.0 V

HBR

VCC = 5 V 60 mV[p-p]

INH

VCC = 5 V −150 0 150 mV

OF

VCC = 5 V 50 100 150 mV

DZ

VCC = 5 V, EC = ECR = 2.5 V −5 −1 µA

IN

VDD = 5 V, RCS = 0.5 Ω 0.31 0.41 0.51 A/V

CS

VCC = 5 V, IO = −300 mA  0.9 1.6 V

OH

VCC = 5 V, IO = 300 mA  0.2 0.6 V

OL

VCC = 5 V, RCS = 0.5 Ω 390 530 670 mA

TL

VCC = 5 V, IFG = − 0.01 mA 3.0  V

H

VCC = 5 V, IFG = 0.01 mA 0.5 V

L

VCC = 5 V, 1.5  3.0 V

FGR

Input D-range at H2+, H2−
VCC = 5 V 1 10 20 mV

FG

VCC = 5 V, FC = 0.5 V −100 −50 −25 µA

CH

VCC = 5 V, FC = 2.5 V 25 50 100 µA

DCH

VCC = 5 V 5 10 20 times

V1

VCC = 5 V 10 50  mA

SWB

CC

V

• Design reference data

Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

Parameter Symbol Conditions Min Typ Max Unit

Thermal protection

Thermal protection operating T

SDONVCC

= 5 V, ∆EC = 100 mV  170 °C

temperature
Thermal protection hysteresis width ∆T

VCC = 5 V, ∆EC = 100 mV  45 °C

SD

4

ICs for Motor AN8481SB

■ Usage Notes

Prevent this IC from being line-to-ground fault. (To be concrete, do not short-circuit any of pins A1 (pin 27), A2 (pin

26) and A3 (pin 25) to V

■ Application Notes

• PD  Ta curves of HSOP042-P-0400

pin (pin 19) or VM pin (pin 20).)

REG

2 400

2 232

2 200

2 000

1 800

(mW)

D

1 600

1 400

1 200

1 042

1 000

Power dissipation P

800

Independent IC
without a heat sink

600

R

= 120°C/W

th( j-a)

PD = 1 042 mW (25°C)

400

200

0

0 25 150

50 75 100 125

Ambient temperature Ta (°C)

 T

P

D

a

Mounted on standard board
(glass epoxy: 75 × 75 × t1.6 mm

R

= 56°C/W

th(j-a)

PD = 2 232 mW (25°C)

3

)

• Phase conditions between Hall input and output current

Phase of Hall pin

H1

H3

H1+ H3+H2+

A

HML

B

HML

C

MLH

D

LMH

E

LMH

F

MLH

A3 A3A2 A1 A2 A1

Emit

Output current

Sink

ABCDE

H2

H2H1

H3

0

ECR

EC

0

0

F

5

AN8481SB ICs for Motor

■ Application Circuit Example

0.1 µF

= 0.5 Ω

R

CS

VM
20

CS1
22

A1
27

A2
26

A3
25

FG

9

PG
28

12 V

100 µF

68 µH

PCS

1 kΩ

REF

V

REG

1 µF

SWB

200 Ω

SWG

GND

21

19

18

17

16

14

Lower

side
V

CE

detection

Amp.

15

2 700 pF

FC

Upper side

distribution

Triangular

wave

1
H1+

Amp.

Direction changeover

Hall amp. matrix

2
H1−

Lower side
distribution

3
H2+

Amp.

4
H2−

Direction
detection

Detection

5
H3+

Logic

ER

EP = ER × EA

6
H3−

Hall
bias

7
VH

VTL

Absolute

value

EA

11

EC

FG

comparator

Thermal

protection

circuit

Start/stop

10

ECR

13

12

8

0.1 µF

S/S

VCC = 5V

V

CC

PCI

System
control
High: Start

command

Servo-torque

6