National Semiconductor LM384 Technical data
LM384
5W Audio Power Amplifier
LM384 5W Audio Power Amplifier
August 2000
General Description
The LM384 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is
internally fixed at 34 dB. A unique input stage allows ground
referenced input signals. The output automatically selfcenters 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
comprising 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 drivers, TV sound systems, AM-FM radio, sound projector systems, etc. See AN-69 for circuit details.
Schematic Diagram
Features
n Wide supply voltage range: 12V to 26V
n Low quiescent power drain
n Voltage gain fixed at 50
n High peak current capability: 1.3A
n Input referenced to GND
n High input impedance: 150kΩ
n Low distortion: 0.25% (P
n Quiescent output voltage is at one half of the supply
voltage
n Standard dual-in-line package
=4W, RL=8Ω)
O
00784303
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Absolute Maximum Ratings (Note 1)
LM384
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 28V
Peak Current 1.3A
Power Dissipation (See (Notes 4, 5)) 1.67W
Input Voltage
Storage Temperature −65˚C to +150˚C
±
0.5V
Operating Temperature 0˚C to +70˚C
Lead Temperature
(Soldering, 10 sec.) 260˚C
Thermal Resistance
θ
JC
θ
JA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Operating Ratings indicate conditions for which the
device is functional, but do not guarantee specific performance limits.
Electrical Characteristics (Note 2)
Symbol Parameter Conditions Min Typ Max Units
Z
IN
I
BIAS
A
V
P
OUT
I
Q
V
OUT Q
BW Bandwidth P
+
V
I
SC
PSRR
RTO
THD Total Harmonic Distortion P
Note 2: V+= 22V and TA= 25˚C operating with a Staver V7 heat sink for 30 seconds.
Note 3: Rejection ratio referred to the output with C
Note 4: The maximum junction temperature of the LM384 is 150˚C.
Note 5: The package is to be derated at 15˚C/W junction to heat sink pins.
Note 6: Output is fully protected against a shorted speaker condition at all voltages up to 22V.
Input Resistance 150 kΩ
Bias Current Inputs Floating 100 nA
Gain 40 50 60 V/V
Output Power THD = 10%, RL=8Ω 5 5.5 W
Quiescent Supply Current 8.5 25 mA
Quiescent Output Voltage 11 V
= 2W, RL=8Ω 450 kHz
OUT
Supply Voltage 12 26 V
Short Circuit Current (Note 6) 1.3 A
Power Supply Rejection Ratio 31 dB
(Note 3) )
= 4W, RL=8Ω 0.25 1.0 %
OUT
= 5 µF, freq = 120 Hz.
BYPASS
30˚C/W
79˚C/W
Heat Sink Dimensions
Staver Company
41 Saxon Ave.
P.O. Drawer H
Bay Shore, N.Y.
Tel: (516) 666-8000
Staver “V7” Heat Sink
00784304
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Typical Performance Characteristics
LM384
Device Dissipation vs
Ambient Temperature
Supply Decoupling vs
Frequency
00784310
Thermal Resistance vs
Square Inches
00784311
Total Harmonic Distortion
vs Output Power
Output Voltage Gain vs
Frequency
00784312
00784314
00784313
Total Harmonic Distortion
vs Frequency
00784315
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