Parameter Symbol Conditions Rated value Unit

Recommended supply voltage VCC 14 V

Recommended load resistance range RL op 4 ΩAllowable operating supply voltage range VCC op 5.5 to 22 V

SANYO Electric Co.,Ltd. Semiconductor CompanyTOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Ordering number : ENN8177

32405TN (OT) No.8177-1/6

OverviewThe LA4631 (5 W × 2 channels) is a single-ended power IC that has a pin arrangement similar to the LA4632 BTLpower IC (10 W × 2 channels). The LA4631's pin compatibility makes it possible to share a common printed circuitboard among a series of end products differentiated by power rank. (Note that the LA4632 is provided in an SIP-12Hpackage, and that it is necessary to provide a hole for the LA4631 pin 13 if the same printed circuit board is to beshared. Note also that certain external components differ.)

Functions and Applications• Two-channel power amplifier for audio applications

Absolute Maximum Ratings at Ta = 25°C

SANYO Semiconductors

DATA SHEET

LA4631Monolithic Linear IC

5 W Two-Channel AF Power Amplifierfor Audio Applications

Any and all SANYO products described or contained herein do not have specifications that can handleapplications that require extremely high levels of reliability, such as life-support systems, aircraft'scontrol systems, or other applications whose failure can be reasonably expected to result in seriousphysical and/or material damage. Consult with your SANYO representative nearest you before usingany SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or otherparameters) listed in products specifications of any and all SANYO products described or containedherein.

Parameter Symbol Conditions Rated value Unit

Maximum supply voltage VCC max With no input signal 24 V

Maximum output current IO peak Per channel 2 A

Allowable power dissipation Pd max With an infinitely large heat sink 15 W

Maximum junction temperature Tj max 150 °C

Operating temperature Topr –20 to +75 °C

Storage temperature Tstg –40 to +150 °C

Operating Conditions at Ta = 25°C

*: VCC, RL, and the output level must be set for the size of the heat sink used so that the Pd max range is not exceeded.

Parameter Symbol ConditionsRatings

Unitmin typ max

Standby current Ist VSTB = 0 V 1 10 µA

Quiescent current drain ICCO Rg = 0, VSTB = 5 V 18 35 80 mA

Standby pin applied voltage Vst The pin 5 voltage such that the amplifier is on 1.5 5 V

Output power PO THD = 10 % 4 5 W

Total harmonic distortion THD VO = 1 W 0.15 0.4 %

Voltage gain VG VO = 0 dBm 33 35 37 dB

Output noise voltage (rms) VNO Rg = 0, BPF = 20 Hz to 20 kHz 0.05 0.25 mVrms

Supply voltage rejection ratio SVRR Rg = 0, fR = 100 Hz, VCCR = 0 dBm 50 60 dB

Channel separation CH. Sep Rg = 10 kΩ, VO = 0 dBm 45 55 dB

Input resistance Ri 20 30 40 kΩ

No.8177-2/6

LA4631

0.40.5

C0.7

1.15

25.6 10.0

2.4 ( 2.0)

1.2 2.0(0.8)

1 13

1.0m

in

4.5

15.4

max

(1

1.8)

11.2

(13.

9)

3.0m

in 3.4

SANYO : SIP13H

0

Pd max -- Ta

ILA06982

--20

16

12

14

6

8

10

4

2

200 40 60 80 100 120 140 160

15

11.7

5.8

2.0

100×100×1.5mm3

50×50×1.5mm3

Allo

wab

le p

ower

dis

sipa

tion,

Pd

max

- W

Ambient temperature, Ta - °C

With an infinitelylarge heat sink

Aluminum heat sinkTightening torque: 39 N cmWith silicone grease appliedθjc = 3 ºC/W

Without a heat sink

Package Dimensionsunit : mm3236

Operating Characteristics at Ta = 25°C, VCC = 14 V, RL = 4 Ω, f = 1kHz, Rg = 600 Ω

• CautionAlthough the LA4631 is basically pin compatible with the LA4632, there are certain differences in the externalcomponents and the way the devices are used.

• The amplifier can be turned on or off by controlling the high/low state of pin 5.• The amplifier is turned on by applying a voltage of 1.5 V or higher or an influx current of 800 µA or higher. (If a 5

V level is applied directly to pin 5, the pin 5 influx current will be about 4.5 mA.)• If a voltage, Vx, that exceeds 5 V will be applied, insert a current limiter resistor (Rx) so that the influx current does

not exceed 4.5 mA. (See the formula below.)Rx = (Vx – 5 V) / 4.5 mA

• When pin 5 is controlled by a microcontroller, to set up a pin 5 influx current (Ix) optimal for the drive capacity ofthe microcontroller, calculate Rx from the following formula as a first approximation and measure the influxcurrent to verify that level.

Rx = (Vx / Ix) – R1 (2 kΩ) *: When a voltage is applied to the standby pin (pin 5), refer to the above and insert a resistor (Rx) to limit the influx

current if required.

No.8177-3/6

LA4631

Application Circuit Example

IN1 IN2 P.PPWRGNDOUT2 NC NC NCStandby VCC

PREGND

RippleFilter OUT1

LA4631

Top view

VS

TB

5V

+

C3

100µ

F 1

6V

+

C1

1µF

10V

C2

1µF

10V

+ +

C4

4.7µ

F 1

6VC

5 10

00µF

25V

VCC

+

+

1 2 3 4 5 6 7 10 11 12 138 9

C6

1000

µF 1

6V

+

C7

1000

µF 1

6V

RL

4Ω

RL

4Ω+

IxRx

Ix=max 4.5mA

STBYR22kΩ

R1

2kΩ

5

(Reference) Pin 5 IC internal equivalent circuit

Standby applied voltage Vx

No.8177-4/6

LA4631

Block Diagram

2ch1 Input

ch2 Input

Pre GND

ch1 Output

ch2 Output

Power GND

5

3

4

6 1

12

10

7

8

Standby

P.P Ripple Filter

VCC

ch2 Inputamplifier

Pre-driveamplifier

Pre-driveamplifier

Pop noise prevention block

Standby Switch

Ripple filter

TSD protector

ch1 Inputamplifier

Outputamplifier

Outputamplifier

REFamplifier

RNF1

Rf1

Rf2RNF2

External Components and Usage NotesC1, C2: These are input coupling capacitors; we recommend a value of 1 µF or lower. The LA4631 input pin

potential is about 1.4 V, and the polarity must be considered due to the DC potential of the circuitsconnected to the LA4631 front end. The amplifier's startup time (the time from the point power is firstapplied until the point an output is generated) will change proportionally with the values of these inputcapacitors. (When 1 µF capacitors are used, the startup time will be about 0.2 seconds.)

C3: This capacitor is used as a ripple filter. We recommend a value of 100 µF. Amplifier impulse noise whenturned off (when the standby pin goes low) may be made worse if a value under 100 µF is used. The pin 1voltage is about 1/2 VCC. A DC mute function can be applied if pin 1 is connected to ground through a300 to 500 Ω resistor. Note that the muting activation voltage will be too low if a resistor value of 750 Ωor higher is used.

C4: This is an impulse noise prevention capacitor. The recommended value is 4.7 µF. If a value of 2.2 µF orlower is used for C4, impulse noise when the amplifier is turned off (when the standby pin goes low) maybe made worse. Also, if a value of 10 µF or higher is used, an "incomplete muting" phenomenon mayoccur when the amplifier is turned off (when the standby pin goes low).

C5: Power supply capacitor. This capacitor should be located as close as possible to the IC (to minimizeincreases in the power supply line impedance) to achieve stable amplifier operation.

C6, C7: Output capacitors. These capacitors influence the amplifiers low band frequency characteristics. (fc = 1/2πCout × RL)fc = low band cutoff frequency, Cout = C6, C7

No.8177-5/6

LA4631

00

10

20

30

2

40

70

60

50

4 8 166 10 1412 18 2620 22 24

ICCO -- VCC

ILA06983

THD -- PO

ILA06985

THD -- f

ILA06986

640

2

4

6

8

10

1

3

5

7

9

8 16 2012 14 1810 22

PO -- VCC

ILA06984

VCC=14VRL=4ΩRg=600ΩFilter : FLAT

VCC=14VRL=4ΩRg=600ΩPO=1WFilter : FLAT

VCC=14VRL=4ΩRg=600ΩVO=0dBm

VCC=14VRL=4ΩRg=600Ω

0.1 1.02 3 5 7 102 3 5 7

10

7

5

3

3

2

7

5

3

2

2

1.0

0.110 1002 3 5 7 2 3 5 7 2 3 5 7 2 3 5 71k 10k 100k

7

5

3

2

1.0

7

5

3

2

10

0.1

Response -- f

ILA06987

10 1002 3 5 7 2 3 5 7 2 3 5 7 2 23 5 71k

1k100 10k 100k2 3 5 7 2 3 5 7 2 3 5 7

10k 100k

0

--1

--2

--3

--4

--8

--5

--6

--7

1PO -- f

ILA06988

10 1002 3 5 7 2 3 5 7 2 3 5 7 2 3 5 71k 10k 100k

5

4

3

2

0

1

6

0

0.1

0.2

0.3VNO -- Rg

ILA06990

RL=4ΩRg=0

Rg=600Ωfin=1kHzTHD=10%

f=10kHz

f=100Hz

f=1kHz

THD=10%

THD=1%

Ch sep -- f

ILA06989

10 1002 3 5 7 2 3 5 7 2 3 5 2 3 571k 10k

--40

--50

--70

--60

--30VCC=14VRL=4ΩRg=10kΩDIN AUDIO

VCC=14VRL=4ΩDIN AUDIO

Qui

esce

nt c

urre

nt, I

CC

O -

mA

Supply voltage, VCC - V Supply voltage, VCC - V

Out

put p

ower

, PO

- W

Out

put p

ower

, PO

- W

Tota

l har

mon

ic d

isto

rtio

n, T

HD

- %

Tota

l har

mon

ic d

isto

rtio

n, T

HD

- %

Output power, PO - W Frequency, f - Hz

Frequency, f - HzFrequency, f - Hz

Frequency, f - Hz

Res

pons

e -

dBC

hann

el s

epar

atio

n, C

hsep

- d

B

Out

put n

oise

vol

tage

, VN

O -

mV

rm

s

Signal source resistance, Rg - Ω

CH2 1

CH1 2

PS No.8177-6/6

LA4631

Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guaranteesof the performance, characteristics, and functions of the described products as mounted in the customer'sproducts or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and allsemiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,or that could cause damage to other property. When designing equipment, adopt safety measures sothat these kinds of accidents or events cannot occur. Such measures include but are not limited to protectivecircuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or al l SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations,such products must not be expor ted without obtaining the expor t l icense from the authorit iesconcerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic ormechanical, including photocopying and recording, or any information storage or retrieval system,or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.

Any and all information described or contained herein are subject to change without notice due toproduct/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only ; it is notguaranteed for volume production. SANYO believes information herein is accurate and reliable, butno guarantees are made or implied regarding its use or any infringements of intellectual property rightsor other rights of third parties.

This catalog provides information as of March, 2005. Specifications and information herein are subject

to change without notice.

50--70

--40

--30

0

--60

--50

--20

--10

15 2010 25

SVRR -- VCC

ILA06991

RL=4ΩRg=0fR=100HzVCCR=0dBmDIN AUDIO

0.50--70

--40

--60

--50

1.5 2.01.0 2.5

VCCR -- Vrms

SVRR -- VCCR

ILA06993

VCC=14VRL=4ΩRg=0fR=100HzDIN AUDIOSVRR=20log (VO / VCCR)

--70

--40

--30

--60

--50

SVRR -- fRVCC=14VRL=4ΩRg=0VCCR=0dBmDIN AUDIO

fR -- Hz ILA06992

10 1002 3 5 7 2 3 5 7 2 3 5 7 21k 10k

Sup

ply

volta

ge r

ejec

tion

ratio

, SV

RR

- d

BS

uppl

y vo

ltage

rej

ectio

n ra

tio, S

VR

R -

dB

Sup

ply

volta

ge r

ejec

tion

ratio

, SV

RR

- d

B

Supply voltage, VCC - V