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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) DS006977-2 DS006977-1 Order Number LM380N See NS Package Number N14A Order Number LM380N-8 See NS Package Number N08E © 1999 National Semiconductor Corporation DS006977 www.national.com Block and Schematic Diagrams LM380N LM380N-8 DS006977-3 DS006977-4 DS006977-5 www.national.com 2 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