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LM380 Audio Power Amplifier
December 1994
LM380 Audio Power Amplifier
General Description
The LM380 is a power audio amplifier for consumer application. In order to hold system cost to 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. 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 n Standard dual-in-line package n n n n n n n n
Connection Diagrams
(Dual-In-Line Packages, Top View)
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Order Number LM380N See NS Package Number N14A
Order Number LM380N-8 See NS Package Number N08E
© 1999 National Semiconductor Corporation
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Block and Schematic Diagrams
LM380N 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 Peak Current Package Dissipation 14-Pin DIP (Note 7) Package Dissipation 8-Pin DIP (Note 7) Input Voltage Storage Temperature 22V 1.3A 8.3W 1.67W ± 0.5V -65°C to +150°C
Operating Temperature Junction Temperature Lead Temperature (Soldering, 10 sec.) ESD rating to be determined Thermal Resistance JC (14-Pin DIP) JC (8-Pin DIP) JA (14-Pin DIP) JA (8-Pin DIP)
0°C to +70°C +150°C +260°C
30°C/W 37°C/W 79°C/W 107°C/W
Electrical Characteristics (Note 2)
Symbol POUT(RMS) AV VOUT ZIN THD PSRR VS BW IQ VOUTQ IBIAS ISC Gain Output Voltage Swing Input Resistance Total Harmonic Distortion Power Supply Rejection Ratio Supply Voltage Bandwidth Quiescent Supply Current Quiescent Output Voltage Bias Current Short Circuit Current Inputs Floating 8 POUT = 2W, RL = 8 (Notes 5, 6) (Note 3) 10 100k 7 9.0 100 1.3 25 10 RL = 8 Parameter Output Power Conditions RL = 8, THD = 3% (Notes 4, 5) Min 2.5 40 50 14 150k 0.2 38 22 60 Typ Max Units W V/V Vp-p % dB V Hz mA V nA A
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: VS = 18V and TA = 25°C unless otherwise specified. Note 3: Rejection ratio referred to the output with CBYPASS = 5 µF. 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: CBYPASS = 0.47 µfd on Pin 1. 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.
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Heat Sink Dimensions
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Staver Heat Sink #V-7 Staver Company 41 Saxon Ave. P.O. Drawer H Bayshore, NY 11706 Tel: (516) 666-8000 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
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Device Dissipation vs Output Power -- 4 Load
Device Dissipation vs Output Power -- 8 Load
Device Dissipation vs Output Power -- 16 Load
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Typical Performance Characteristics
Power Supply Current vs Supply Voltage
(Continued) Output Voltage Gain and Phase vs Frequency
Total Harmonic Distortion vs Frequency
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Total Harmonic Distortion vs Output Power
Device Dissipation vs Output Power
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
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