LM4752

Stereo 11W Audio Power Amplifier

General Description

The LM4752 is a stereo audio amplifier capable of delivering

11W per channel of continuous average output power to a

4

Ω load, or 7W per channel into 8Ω using a single 24V sup-

ply at 10% THD+N.

The LM4752 is specifically designed for single supply opera-

tion and a low external component count. The gain and bias

resistors are integrated on chip, resulting in a 11W stereo

amplifier in a compact 7 pin TO220 package. High output

power levels at both 20V and 24V supplies and low external

component count offer high value for compact stereo and TV

applications. A simple mute function can be implemented

with the addition of a few external components.

Key Specifications

n Output power at 10% THD+N with 1 kHz into 4

Ω at V

CC

= 24V

11W (typ)

n Output power at 10% THD+N with 1 kHz into 8

Ω at V

CC

= 24V

7W (typ)

n Closed loop gain

34 dB (typ)

pkg. at V

2.5W (typ)

at V

5W (typ)

Features

n Drives 4

Ω and 8Ω loads

n Minimum external component requirement

n Single supply operation

n Internal current limiting

n Internal thermal protection

n Compact 7 lead TO-220 package

n Low cost-per-watt

Applications

n Compact stereos

n Stereo TVs

n Mini component stereos

n Multimedia speakers

Typical Application

Connection Diagram

DS100039-1

FIGURE 1. Typical Audio Amplifier Application Circuit

Plastic Package

DS100039-2

Package Description

Top View

Order Number LM4752T

Package Number TA07B

DS100039-50

Package Description

Top View

Order Number LM4752TS

Package Number TS07B

February 1999

© 1999 National Semiconductor Corporation

DS100039

www.national.com