Sanyo LA4550 Specifications

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.

Monolithic Linear IC

2-Channel AF Power Amplifier

for Radio, Tape Recorder Use

Ordering number:ENN1718B

LA4550

SANYO Electric Co.,Ltd. Semiconductor Company

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

Features

• Low quiescent current.

• On-chip 2 channels permitting use in stereo and bridge
amplifier applications.

• High output.

• Minimum number of external parts required.
(9 pcs. munimum)

• Good ripple rejection (at steady state).

• Soft tone at the output saturation mode.

• Good channel separation.

• Easy thermal design.

• Small pop noise at the time of power supply ON/OFF.

Specifications

Absolute Maximum Ratings at Ta = 25˚C

retemaraPlobmySsnoitidnoCsgnitaRtinU

egatlovylppusmumixaMV

noitapissidrewopelbawollA*xamdP 4W

erutarepmetgnitarepOrpoT 57+ot02–

erutarepmetegarotSgtsT 051+ot55–

* With recommended PCB (See sample printed circuit pattern.)

Operating Conditions at Ta = 25˚C

retemaraPlobmySsnoitidnoCsgnitaRtinU

egatlovylppusdednemmoceRV

ecnatsiserdaoldednemmoceRR

egnaregatlovgnitarepOV

xam 31V

CC

CC

L

po 21ot6.3V

CC

V6LTB 8ot4

V9LTB 8

Package Dimensions

unit:mm

3022A-DIP12F

[LA4550]

12

1

0.81

V6oeretS 8ot2

V9oeretS 8ot4

0.5

2.54

5.12

19.4

3.6

7

7.62

6.45

6

3.46

4.26max

3.5

0.51min

1.3

SANYO : DIP12F

0.4

˚C
˚C

9,6V

Ω
Ω
Ω
Ω

21800TN (KT)/O147KI/6215MW, TS No.1718–1/9

LA4550

Operating Characteristics at Ta = 25˚C, V

See specified Test Circuit.

retemaraPlobmySsnoitidnoC

tnerructnecseiuQoccI

niagegatloVGVV,0=fR

ecnereffiDniagegatloV

rewoptuptuOP

noitrotsidcinomrahlatoTDHTPOWm052=3.05.1%

ecnatsisertupnIir1203kΩ

egatlovesiontuptuOV

noitcejerelppiRrRV,zH001=f,0=gR

klatssorCTCk01=gR Ω V,zHk1=f,

∆ GV

O

ON

Equivalent Circuit Block Diagram

=9V, f=1kHz, Rg=600Ω, RL=4Ω, ( ) : RL=8Ω,

CC

nimpytxam
V9oeretS5103Am
V6oeretS31Am

mBd15–=941535Bd

NI

V,0=fR

V:LTB

V:LTB

0=gR5.00.1Vm

k01=gR Ω 8.00.2Vm

mBd15–=1±Bd

NI

V:oeretS

CC

CC

V:oeretS

CC

CC

%01=DHT,V6=6.00.1W

%01=DHT,V6=5.2W

%01=DHT,V9=6.11.2W

%01=DHT,V9=)1.4(W

Vm051=0484Bd

R

mBd0=0485Bd

O

sgnitaR

tinU

Sample Application Circuit

[Stereo Use]

No.1718–2/9

LA4550

Sample Printed Circuit Pattern Cu foil-reduced board

[BTL Use 1]

[BTL Use 2]

Description of External Parts

C1 (C2) : Feedback capacitor. The low cutoff frequency is determined by the following formula.

fL=

Since this capacitor as well as decoupling capacitor affects the starting time, the capacitor value must be f ix ed
with the necessary low frequency band fully considered.

C3 (C4) : Bootstrap capacitor. The output at low frequencies depends on this capacitor. Decreasing the capacitor value

lowers the output at low frequencies. A capacitor value of 47µF or more is required.

C5 (C6) : Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and

temperature characteristic. The use of an electrolytic capacitor, ceramic capacitor may cause oscillation to
occur at low temperatures.

1

2πC1Rf

Rf : Feedback resistor
fL : Low cutoff frequency

Continued on next page.

No.1718–3/9