LM380 Audio Power Amplifier
December 1994
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
Wide supply voltage range
Low quiescent power drain
Voltage gain fixed at 50
High peak current capability
Input referenced to GND
High input impedance
Low distortion
Quiescent output voltage is at one-half of the supply
voltage
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Standard dual-in-line package
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Connection Diagrams
(Dual-In-Line Packages, Top View)
DS006977-2
DS006977-1
Order Number LM380N
See NS Package Number N14A
Order Number LM380N-8
See NS Package Number N08E
© 1999 National Semiconductor Corporation
DS006977
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
