LM384

5W Audio Power Amplifier

General Description

The LM384 is a power audio amplifier for consumer applica-

tion. In order to hold system cost to a minimum, gain is inter-

nally fixed at 34 dB. A unique input stage allows inputs to be

ground

referenced.

The

output

is

automatically

self-centering to one half the supply voltage.

The output is short-circuit proof with internal thermal limiting.

The package outline is standard dual-in-line. A copper lead

frame is used with the center three pins on either side com-

prising a heat sink. This makes the device easy to use in

standard p-c layout.

Uses include simple phonograph amplifiers, intercoms, line

drivers, teaching machine outputs, alarms, ultrasonic driv-

ers, TV sound systems, AM-FM radio, sound projector sys-

tems, etc. See AN-69 for circuit details.

Features

n Wide supply voltage range

n Low quiescent power drain

n Voltage gain fixed at 50

n High peak current capability

n Input referenced to GND

n High input impedance

n Low distortion

n Quiescent output voltage is at one half of the supply

voltage

n Standard dual-in-line package

Schematic Diagram

DS007843-3

February 1995

© 1999 National Semiconductor Corporation

DS007843

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