Ordering number : ENN6630

O3100RM (OT) No. 6630-1/9

Overview

The LA4743B is a 45 W 4-channel power amplifier IC for

car stereo systems. It features a built-in bridge circuit and

the ability to radically reduce the number of external

components required. It is also pin compatible with the

LA4743A, which differs in the amount of gain provided.

Features

• Maximum output power: 45 W

× 4 channels

• 40 W

× 4 channels (V

• Requires only seven external components and does not

require an oscillation prevention RC circuit, a noise

filter, or a BS capacitor.

Functions

• Muting function

• Built-in standby switch

• Full complement of built-in protection circuits,

ground, load shorting, overvoltages, and overheating.

Package Dimensions

unit: mm

3236-HZIP25

2.0

2.0

29.2

2.60

(1.0)

25.6

0.53

R1.7

0.4

4.5

4.0

4.0

SANYO: HZIP25

[LA4743B]

LA4743B

SANYO Electric Co.,Ltd. Semiconductor Company

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

45 W Four-Channel (Bridge Circuit) Power Amplifier

Monolithic Linear IC

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.

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

Signal present

18

V

No signal (for 1 minute)

26

V

Maximum output current

4.5/ch

A

Allowable power dissipation

Pd max

With an arbitrarily large heat sink

50

W

Operating temperature

Topr

–40 to +85

°C

Storage temperature

Tstg

–40 to +150

°C

Package thermal resistance

θjc

1

°C/W

Specifications

Maximum Ratings at Ta = 25°C