Datasheet LM380N-8 Datasheet (NSC)

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

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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

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LM380N-8

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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

%

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Heat Sink Dimensions

Staver Heat Sink#V-7
Staver Company
41 Saxon Ave.
P.O. Drawer H
Bayshore, NY 11706
Tel: [phone]
Copper Wings
2 Required
Soldered to
Pins 3, 4, 5,
10, 11, 12
Thickness 0.04
Inches

Typical Performance Characteristics

Maximum Device Dissipation vs
Ambient Temperature

Device Dissipation vs Output
Power—4Ω Load

Device Dissipation vs Output
Power—8Ω Load

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Device Dissipation vs Output
Power—16Ω Load

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Typical Performance Characteristics (Continued)

Power Supply Current vs
Supply Voltage

Total Harmonic Distortion
vs Output Power

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Total Harmonic Distortion
vs Frequency

Device Dissipation vs
Output Power

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Output Voltage Gain and
Phase vs Frequency

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Supply Decoupling vs
Frequency

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Typical Applications

Phono Amplifier

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Bridge Amplifier

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Typical Applications (Continued)

Intercom

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Phase Shift Oscillator

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Physical Dimensions inches (millimeters) unless otherwise noted

Molded Dual-In-Line Package (N)

Order Number LM380N-8

NS Package Number N08E

Molded Dual-In-Line Package (N)

Order Number LM380N

NS Package Number N14A

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LM380 Audio Power Amplifier

Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

labeling, can be reasonably expected to result in a
significant injury to the user.

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Corporation

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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