LM380

Audio Power Amplifier

General Description

The LM380 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, small servo drivers,

power converters, etc.

A selected part for more power on higher supply voltages is

available as the LM384. For more information see AN-69.

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

DS006977-1

Order Number LM380N

See NS Package Number N14A

DS006977-2

Order Number LM380N-8

See NS Package Number N08E

December 1994

© 1999 National Semiconductor Corporation

DS006977

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