Panasonic AN8737SB Datasheet

ICs for Optical Disk Drive

AN8737SB

3-channel driver IC for optical disk drive

■ Overview

The AN8737SB is a BTL type 3-channel driver
IC, adopting a current feedback system for 2 chan­nels, which makes it optimum for an actuator and a
motor driver of CD-ROM/DVD-ROM. It can also
constitute an optimum system in combination with
the AN8488SB, a spindle plus loading driver IC. A
surface mount-type package of good heat radiation
characteristic is used.

■ Features

• Little phase delay due to a current feedback system

(2 channels for actuator)

• The remaining channel is available for either

traverse or loading motor drive.

• Wide output dynamic range (4 V/I

= 800 mA)

O

• Standby function built in (all channels can be

muted.)

• Thermal shut-down circuit built in

• With thermal flag pin

■ Applications

• CD/CD-ROM player

• DVD/DVD-ROM drive

18.4±0.2
(5.15)

28 22 21

17 814

(1.2)

(4.8)

(6.4)

0.8

15

8.3±0.22.7±0.20.1±0.1

+0.10

0.35

–0.05

Seating plane

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

AN8737SB ICs for Optical Disk Drive

■ Block Diagram

PGND1

V

REF

N.C.

13

26

10

CC1

VO1−

5

VS1

12

VO1+

VO2+

VS2

VO2−

15

28

14

PV

8

1

V

CC

2

9

V

det.

7

CC

CC

SV

TFLG

20

Temp.

det.

16

CC2

VO3−

VO3+

PV

19

21

1

V

CC

2

17

PGND2

Reset

18

PC2

V

REF

reset

6

VRB1

3

IN1

4

OUT1

1

OUT2

2

IN2

27

VFB2

11

PC1

24

SB

23

IN3N

25

IN3P

Fin

SGND

■ Pin Descriptions

Pin No. Description

1 Ch. 2 first stage feedback pin
2 Ch. 2 first stage input pin
3 Ch. 1 first stage input pin
4 Ch. 1 first stage feedback pin
5 Ch. 1 current feedback input pin
6 Ch. 1 current feedback output pin
7 Control side power supply pin
8 Ch. 1 & ch. 2 power side power supply pin

9 Ch. 1 reverse direction output pin
10 N.C.
11 Ch. 1 & Ch. 2 mute pin
12 Ch. 2 forward direction output pin
13 Ch. 1 & ch. 2 power side grounding pin
14 Ch. 2 reverse direction output pin
15 Ch. 2 forward direction output pin

Pin No. Description

16 Ch. 3 reverse direction output pin
17 Ch. 3 power side grounding pin
18 Ch. 3 mute pin
19 Ch. 3 forward direction output pin
20 TDS flag pin
21 Ch. 3 power side power supply pin
22 N.C.
23 Ch. 3 reverse rotation input pin
24 Standby input pin
25 Ch. 3 forward rotation input pin
26 Reference voltage input pin
27 Ch. 2 current feedback output pin
28 Ch. 2 current feedback input pin

Fin Control side grounding pin

2

ICs for Optical Disk Drive AN8737SB

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply voltage range SVCC , PV

2

Supply current

Power dissipation
Operating ambient temperature
Storage temperature

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

2: I

*

PVCC1

3: Use within the range of PD = 542 mW or less at Ta = 85°C, following the allowable power dissipation characteristic curve

*

of "■ Application Notes".

*

3

*

1

*

1

*

be 1 A or less for channel 1 and channel 2, respectively.

I

SVCC

I

PVCC1

I

PVCC2

P
T
T

CC

CC1

D

opr

stg

, PV

CC2

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage SV

PV

CC1

CC

, PV

CC2

14.0 V

− 0.3 to +14.0 V

500 mA

2.0 A
800 mA
542 mW

−30 to +85 °C

−55 to +150 °C

4.5 to 13.5 V

3.5 to 13.5

■ Electrical Characteristics at SVCC = 12 V, PV
VSB = V

PC1

= V

= 3.3 V, V

PC2

IN1

= V

IN2

= V

IN3

= 5 V, PV

CC1

= 5 V, RL = 8 Ω, V

CC2

= 1.65 V, Ta = 25°C

= 1.65 V,

REF

Parameter Symbol Conditions Min Typ Max Unit

= V

= V

, V

Current consumption 1 I
(no signal) VSB = V

Current consumption 2 I
(no signal) VSB = V

Current consumption 1 I
(standby) VSB = V

Current consumption 2 I
(standby) VSB = V

SVOVIN1

PVOVIN1

SVSBVIN1

PVSBVIN1

= V

= V

= V

IN2

PC1

IN2

PC1

IN2

PC1

IN2

PC1

= V

= V

= V

= V

= V

= V

= V

PC2

PC2

PC2

PC2

Driver 1, Driver 2 RL1 , RL2 = 4 Ω, RS1 , RS2 = 0.5 Ω, R
Output offset voltage V

OF1VIN

Gain (+)G1+ VIN = V

= V

REF

±50 mV 9 11 13 dB

REF

REF

REF

REF

REF

IN1

= 2.5 V  25 45 mA

IN3P

= 3.3 V

, V

= 2.5 V  25 45 mA

IN3P

= 3.3 V

, V

= 2.5 V  0.6 1.5 mA

IN3P

= 0 V

, V

= 2.5 V  0.2 1.0 mA

IN3P

= 0 V

, R

= 10 kΩ, RF1 , RF2 = 4.3 kΩ

IN2

−100 0 100 mV

Relative gain (+/−)G1 −1.5 +1.5 dB
Maximum output amplitude (+)V

L1+VIN

= 3.3 V, RL1 , RL2 = 4 Ω 3.65 4.0  V

RS1 , RS2 = 0.5 Ω

Maximum output amplitude (−)V

L1−VIN

= 0 V, RL1 , RL2 = 4 Ω−4.0 −3.65 V

RS1 , RS2 = 0.5 Ω

3