NSC LM380N-8 Datasheet
LM380
Audio Power Amplifier
General Description
The LM380 is a power audio amplifier for consumer application. In order to holdsystemcostto a minimum, gain is internally 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 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, small servo drivers,
power converters, etc.
Connection Diagrams (Dual-In-Line Packages, Top View)
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
LM380 Audio Power Amplifier
December 1994
DS006977-2
DS006977-1
Order Number LM380N
See NS Package Number N14A
© 1999 National Semiconductor Corporation DS006977 www.national.com
Order Number LM380N-8
See NS Package Number N08E
Block and Schematic Diagrams
LM380N
DS006977-3
LM380N-8
DS006977-4
www.national.com 2
DS006977-5
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 22V
Peak Current 1.3A
Package Dissipation 14-Pin DIP (Note 7) 8.3W
Package Dissipation 8-Pin DIP (Note 7) 1.67W
Input Voltage
±
0.5V
Operating Temperature 0˚C to +70˚C
Junction Temperature +150˚C
Lead Temperature (Soldering, 10 sec.) +260˚C
ESD rating to be determined
Thermal Resistance
(14-Pin DIP) 30˚C/W
θ
JC
(8-Pin DIP) 37˚C/W
θ
JC
(14-Pin DIP) 79˚C/W
θ
JA
(8-Pin DIP) 107˚C/W
θ
JA
Storage Temperature −65˚C to +150˚C
Electrical Characteristics (Note 2)
Symbol Parameter Conditions Min Typ Max Units
=
=
8Ω, THD=3%(Notes 4, 5) 2.5 W
L
=
8Ω 14 V
L
5µF.
OUT
=
2W, R
=
8Ω 100k Hz
L
P
OUT(RMS)
A
V
V
OUT
Z
IN
Output Power R
Gain 40 50 60 V/V
Output Voltage Swing R
Input Resistance 150k Ω
THD Total Harmonic Distortion (Notes 5, 6) 0.2
PSRR Power Supply Rejection Ratio (Note 3) 38 dB
V
S
Supply Voltage 10 22 V
BW Bandwidth P
I
Q
V
OUTQ
I
BIAS
I
SC
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.
Note 2: V
Note 3: Rejection ratio referred to the output with C
Note 4: With device Pins 3, 4, 5, 10, 11, 12 soldered into a 1/16" epoxy glass board with 2 ounce copper foil with a minimum surface of 6 square inches.
Note 5: C
Note 6: The maximum junction temperature of the LM380 is 150˚C.
Note 7: The package is to be derated at 15˚C/W junction to heat sink pins for 14-pin pkg; 75˚C/W for 8-pin.
Quiescent Supply Current 7 25 mA
Quiescent Output Voltage 8 9.0 10 V
Bias Current Inputs Floating 100 nA
Short Circuit Current 1.3 A
=
S
BYPASS
18V and T
=
25˚C unless otherwise specified.
A
=
0.47 µfd on Pin 1.
BYPASS
p-p
%
www.national.com3
Loading...