Datasheet AN8737SB Datasheet (Panasonic)

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

AN8737SB ICs for Optical Disk Drive

■ 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 (continued)

= 1.65 V,

REF

Parameter Symbol Conditions Min Typ Max Unit

Driver 3 RL = 8 Ω

Output offset voltage V

OF3VIN3P

Gain (+)G3+ V

= V
= 2.5 V, V

IN3P

= 2.5 V −150 0 150 mV

IN3N

= 2.5 V±50 mV 19 20.5 22 dB

IN3P

No external resistor

Relative gain (+/−)G3 −1.5 +1.5 dB

V

Output voltage (+)V

3+

= 5 V, 3.05 3.4 3.75 V

IN3N

RA1 = 27 kΩ, RA2 = 6.8 kΩ

Output voltage (−)V

V

3−

= 0 V, −3.75 −3.4 −3.05 V

IN3N

RA1 = 27 kΩ, RA2 = 6.8 kΩ

Input pin bias current I

IN3

V

= 0 V  1 µA

IN3N

Standby operation High: Active, low or Hi-Z: Standby
High-level SB threshold voltage V
Low-level SB threshold voltage V
SB input current I

SVCC = 12 V 2.6  V

SBH

SVCC = 12 V 0.7 V

SBL

VSB = 5 V  50 120 µA

SB

Power cut operation High: Active, low or Hiz: Power cut
High-level PC1 threshold voltage V
Low-level PC1 threshold voltage V
High-level PC2 threshold voltage V
Low-level PC2 threshold voltage V
PC1 input current I
PC2 input current I

SVCC = 12 V 2.6  V

PC1H

SVCC = 12 V 0.7 V

PC1L

SVCC = 12 V 2.6  V

PC2H

SVCC = 12 V 0.7 V

PC2L

V

PC1

PC2

= 5 V  70 120 µA

PC1

V

= 5 V  70 120 µA

PC2

Reset current

Reset operation release supply V

RST

4.5 V

voltage
V

detection voltage V

REF

R

1.20  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 circuit

Operating temperature T

THD

 160 °C

equilibrium value
Operating temperature ∆T

THD

 40 °C

hysteresis width
Temperature flag balancing T

FLG

 150 °C

value
Temperature flag hysteresis ∆T

FLG

 20 °C

width

4

ICs for Optical Disk Drive AN8737SB

■ 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 (continued)

• Design reference data (continued)

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 circuit (continued)

Operating temperature difference bet.

∆T

TF

 10 °C

thermal protection/temperature flag
Temperature flag output high V

SVCC = 12 V  5  V

FLH

value
Supply voltage detection hysteresis ∆V

HD

 0.2  V

width

■ Usage Notes

1. Use SVCC at the maximum potential.
Otherwise it will cause operation error.

2. Do not use PV

3. Driver 1, driver 2 gain setting
(Use a resistor of sufficient power dissipation for RS .)

CC1

and PV

at 2 V or less, or at the high impedance.

CC2

R

E

C

E

= 1.65 V,

REF

Input

R

V

IN

pin

IN

R

FB

6 or 27

3 or 2

500 Ω

500 Ω

V

REF

200 Ω

V

REF

V

REF

4. On the mode of mute:

SB = PC1 = high

PC2 = high PC2 = low or Hi-Z 

Ch. 1, Ch. 2 Active Active All mute,

Ch. 3 Active Mute power save

Never fail to input the same signal into SB pin (pin 24) and PC1 pin (pin 11).

4 or 1

Forward

rotation pin

× 5

12 or 15

× 5

9 or 14

Pwr. amp.

5 or 28

Reverse

rotation pin

SB = PC1 = low or Hi-Z

4 Ω

0.5 Ω

R

L

R

S

5

AN8737SB ICs for Optical Disk Drive

■ Usage Notes (continued)

5. On the output maximum amplitude (Reference data: typical value)

5.0

4.5

4.0

3.5

Output maximum amplitude (V)

3.0

0.4

0.6 0.8 1.0 1.1

Load current (A)

Use load current at 1 A or less.

6 Appropriate care should be taken on the characteristics.

When changing an external circuit constant on actual use, secure an appropriate margin in consideration of charac­teristic fluctuation of external parts and our ICs including transient characteristics as well as static ones.

7 Avoid the short-circuits between output pin or current detection pin and VCC (line-to-supply fault), output pin or

current detection pin and GND (line-to-ground fault), and output pins or output pin and current detection pin (load
short-ciruit).

8 An appropriate prior study should be done for use of dip soldering.
9 Care should be taken on use of the following pin because of its low static breakdown voltage (C = 200 pF, R = 0 Ω).

Pin 18: Breakdown at 200 V

6

ICs for Optical Disk Drive AN8737SB

■ Application Notes

• PD  Ta curves of HSOP042-P-0400

 T

P

D

a

2.500

2.240

(W)

D

Power dissipation P

2.000

1.500

1.042

1.000

0.500

Independent IC
without a heat sink

= 119.9°C/W

R

th(j-a)

Mounted on standard board
(glass epoxy:

75 mm × 75 mm × t1.6 mm)

= 55.8°C/W

R

th(j-a)

0.000
0 25 50 75 100 125

Ambient temperature Ta (°C)

150

7

AN8737SB ICs for Optical Disk Drive

■ Application Circuit Example

PGND1

V

REF

1.65 V

N.C.

5 V

13

26

10

Snubber

R

R

S1

VS1

5

L1

4.0 Ω

0.5 Ω

CC1

PV

8

1

V

CC

2

VO1−

9

Snubber

R

R

L2

0.5 Ω

VS2

S2

4.0 Ω

VO1+

VO2+

121152282714

12 V

R

VO3−

L2

8.0 Ω

VO3+

High: High

temp.

CC

VO2−

SV

TFLG

19

V

Temp.

CC

det.

det.

5 V

CC2

PV

21

1

V

CC

2

PGND2

17

Reset

18

V

REF

reset

PC2

6

3

VRB1

4.3 kΩ

IN1

4.7 kΩ

R
= 10 kΩ

560 pF

IN2

4

OUT1

OUT2

560 pF

4.7 kΩ

IN2

4.3 kΩ

R

IN2

= 10 kΩ

1172420231625

PC1

VFB2

High: Active
Low : All mute

power save

SB

6.8 kΩ
27 kΩ

IN3N

Fin

SGND

IN3P

8