LA4663.PDF

Ordering number : ENN5905A

Monolithic Linear IC

LA4663

Two-Channel 16-W BTL General-Purpose

Audio Power Amplifier

Overview

The LA4663 is a BTL 2-channel power amplifier IC that

was developed for ease of use in general audio

applications. In addition to providing improvements in a

wide range of electrical characteristics, the LA4663 aims

for improved listenability and an excellent cost-

performance ratio.

(The startup time can be modified in end products by

using this circuit in conjunction with the muting circuit

described above.)

• Full complement of built-in protection circuits

(protection from shorting to ground, shorting to V CC ,

load shorting, and overheating)

• High audio quality, minimal impulse noise

Applications

Radio/cassette players with built-in CD/MD players,

microcomponent stereo systems, active speakers,

electronic musical instruments, and other audio devices.

Package Dimensions

unit: mm

3113A-SIP14HZ

[LA4663]

Features

• Wide operating supply voltage range (V CC op): 5.5 to

22 V (Certain conditions may apply.)

• High ripple rejection ratio: 60 dB (typical)

• Power: 16 W

27.0

20.0

4.0

2 (V CC = 15 V/6

13 W

2 (V CC = 12 V/4

), 6.5 W

2 (V CC = 9 V/4

)

• Built-in signal muting circuit (AC muting) reduces the

number of external components and provides muting

with minimal switching noise.

• Startup circuit with a start time of 0.6 to 0.7 seconds.

The LA4663 provides distortion-free startup, since

output is only generated after the supply voltage reaches

the midpoint at power on.

1.94

0.5

0.4

1.6

3.56

2.2

1.78

3.56

SANYO: SIP14HZ

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V CC max No signal

Maximum output current

I O peak

Per channel

3.5

Allowable power dissipation

Pd max

With an arbitrarily large heat sink

37.5

Operating temperature

Topr

–20 to +75

°C

Storage temperature

Tstg

–40 to +150

°C

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

42800TN (OT)/70898RM (OT) No. 5905-1/10

LA4663

Operating Conditions * 1 at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V CC

12, 15

Recommended load resistance range

R L op

4 to 8

When R L = 8

5.5 to 21

Allowable operating supply voltage range * 2

V CC op

When R L = 6

5.5 to 20

When R L = 5

5.5 to 17

When R L = 4

5.5 to 15

Note * :1. When used with V CC , R L , and output level ranges such that Pd max for the heat sink actually used is not exceeded.

2. When both channels are operating with I O peak values that exceed 2 A per channel.

If the I O peak value does not exceed 2 A per channel, a range of 5.5 to 22 V is allowed for any allowable R L (for ranges where Pd max is not

exceeded).

Operating Characteristics at Ta = 25°C, V CC = 15 V, R L = 4

, f = 1 kHz, Rg = 600

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

Quiescent current

I CCO

Rg = 0, R L = open

100

180

Standby current

Ist

When standby is off and with no power supply capacitor

µA

Voltage gain

V G

V O = 0 dBm

Total harmonic distortion

THD

P O = 1 W, Filter = FLAT

0.07

0.4

P O 1

V CC = 15 V, THD = 10%, R L = 4 ½

Output power

P O 2

V CC = 12 V, THD = 10%, R L = 4 ½

P O 3

V CC = 12 V, THD = 10%, R L = 6 ½

Output offset voltage

V N offset Rg = 0

–300

+300

Output noise voltage

V NO

Rg = 0, BPF = 20 Hz to 20 kHz

0.2

0.5

Ripple rejection ratio

SVRR

Rg = 0, V R = 0 dBm, f R = 100 Hz

Channel separation

CH sep

Rg = 10 k ½ , V O = 0 dBm

Input resistance

k ½

Standby pin applied voltage

V ST

Amplifier on (the pin 5 voltage)

2.5

Muting pin applied voltage

V M

Muting on (the pin 6 voltage)

1.5

Muting attenuation

ATT M

Muting on (V O = 1 V rms), BPF = 20 Hz to 20 kHz

Pd max - Ta

q f - S f

With an Al heat sink

with mounting bolts

tightened down with

a torque of 39 N·cm

and silicone grease

applied.

Al heat sink, t = 1.5 mm

With mounting bolts

tightened down with a

torque of 39 N·cm and

silicone grease applied.

With an arbitrarily large heat sink

qf=3°C/W

qjc=2°C/W

20.8

f=4

C/W

13.9

qf=7°C/W

f=10

C/W

10.4

No radiator fin

3.1

-20

100

120

140

160

100

1000

Ambient temperature, Ta — °C

Heat sink area, S f — cm 2

No. 5905-2/10

LA4663

Usage Notes

1. Maximum ratings

If the device is operated in the vicinity of the maximum ratings, it is possible for small changes in the operating

conditions to result in the maximum ratings being exceeded. Since this can result in destruction of the device,

applications should be designed with adequate margins in the supply voltage and other parameters so that the maximum

ratings are never exceeded during device operation.

2. Protection circuits

While the LA4663 includes a full complement of built-in protection circuits, care is required in the usage. In particular,

be careful not to short any pairs of device pins together.

[Notes on the shorting (power, ground, and load shorting) protection circuit]

• This protection circuit operates whenever a power short (a short between the output and V CC ), a ground short (a short

between the output and ground), or a load short (shorting between the + and – outputs) is detected. Although there are

cases where the protection circuit may not operate if the supply voltage is under 9 V, the thermal protection circuit will

protect the device in this range.

• The protection circuit continues to operate during the interval that the abnormal short continues, and automatically

recovers when the error state is resolved. However, under certain usage conditions, there are situations where the

protection circuit may lock and remain locked even after the problem has been resolved. In these cases, the circuit can

be reset by switching to standby mode or turning off the power temporarily.

• If the output is shorted to V CC with the IC in the standby state and furthermore, a V CC of 20 V or higher applied, an

offset will be created between the + and – outputs. If a load is connected in this state, a current will flow in that load,

and the IC may be destroyed. Applications should assure that this does not occur.

• In the following situations, the operation of the protection circuit may result in a sound switching phenomenon at high

output levels. This may be a problem, depending on the details of the end product circuit itself, and must be verified in

an actual system.

• At low load resistances R L (high loads) and at high V CC voltages, and with both channels operating at I O peak levels of

over 2 A per channel. (This phenomenon is more likely to occur the higher the chip temperature.)

For systems operating under the most sever conditions (high temperatures and high outputs), specific operating

conditions such that the above phenomenon does no occur are listed in the “Allowable operating supply voltage range

(V CC op)” item in the Operating Conditions section of the specifications. (Refer to the V CC op ranges for different R L

values.)

[Thermal protection circuit]

• A thermal protection circuit is provided to prevent damage to or destruction of the IC itself when the IC generates

abnormally high temperatures. This means that gradual attenuation is applied to the output signals by the thermal

protection circuit if the IC junction temperature (Tj) rises above about 160°C due to insufficient heat sinking or other

problems.

3. Notes on printed circuit boards

• When designing the printed circuit board pattern, keep the input lines separated from both the VCC lines and the

output lines. This is to prevent increased distortion and oscillation.

• When high output levels are used, make power-ground lines as wide as possible and as short as possible to prevent the

PWR GND pins potential from increasing with respect to pre-ground. (From the standpoint of IC stability, ideally, the

ground pin potential should be the lowest potential in the system. This is to prevent trouble caused by several types of

induced parasitic devices due to increases in the GND pin potential due to the structure of the IC.)

No. 5905-3/10

LA4663

4. Notes on heat sink mounting

• Use a tightening torque of between 39 and 59 N·cm.

• Make the spacing of the heat sink mounting screw holes the same as the spacing of the IC mounting screw holes. Also,

make the mounting screw hole spacing as short as possible within the range that still allows mounting, referring to the

external dimensions L and R.

A10629

• For mounting screws, use screws that correspond to either the truss screws or binding screws stipulated by the JIS

(Japan Industrial Standards). Use washers to protect the IC case.

• Do not allow any foreign matter, such as machining chips, to get between the IC (package internal) heat sink and the

external heat sink. Also, if grease is applied to the junction, apply the grease as evenly as possible.

5. Other notes

• The LA4663 is a BTL power amplifier IC. When connecting this IC to test equipment, do not allow the test equipment

grounds for the input and output systems to be shared grounds.

No. 5905-4/10

LA4663

Equivalent Circuit Block Diagram

+5 V

V CC

–

2200 µ F

25 V

SIGNAL

MUTE

STAND BY

V CC 1

V CC 2

22 k ½

+5 V

10 µ F

10 V

–

CH 1

0.1 µ F

R L = 4 to 8 ½

+OUT1

4.7

10 V

IN1

2.2 ½

Output amplifier

PWR

GND1

2.2 ½

–

Ri =

20 k

–OUT1

0.1

Input amplifier

PRE

GND

* *

V CC /ground shorting protection

circuit

Load shorting protection circuit

Thermal protection circuit

— Protection circuits —

Polyester film capacitors

+OUT2

0.1

R L = 4 to 8 ½

4.7

Input amplifier

10 V

IN2

2.2

PWR

GND2

Output amplifier

2.2

–

Ri =

20 k ½

0.1

–OUT2

CH 2

Ripple Filter/

Starting Time

47 µ F

25 V

–

A10630

Pin Voltages at V CC = 15 V, with 5 V applied to the STBY pin (pin 5), using a digital volt meter.

Pin No.

IN1

PRE-GND

IN2

STAND-BY

MUTE

V CC 1

Pin voltage (V)

14.32

3 m

21m

Pin No.

V CC 2

+OUT2

PWR-GND2

–OUT2

–OUT1

PWR-GND1

+OUT1

Pin voltage (V)

6.84

No. 5905-5/10

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