LM384 5W Audio Power Amplifier
August 2000
LM384
5W Audio Power Amplifier
General Description
The LM384 is a power audio amplifier for consumer applica-
tions. In order to hold system cost to a minimum, gain is in-
ternally fixed at 34 dB. A unique input stage allows ground
referenced input signals. The output automatically
self-centers 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
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Wide supply voltage range: 12V to 26V
Low quiescent power drain
Voltage gain fixed at 50
High peak current capability: 1.3A
Input referenced to GND
High input impedance: 150k鈩?/div>
Low distortion: 0.25% (P
O
=4W, R
L
=8鈩?
Quiescent output voltage is at one half of the supply
voltage
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Standard dual-in-line package
Schematic Diagram
DS007843-3
漏 2000 National Semiconductor Corporation
DS007843
www.national.com
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