LM384 5W Audio Power Amplifier General Description Features 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 self-centers 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. n n n n n n n n Wide supply voltage range: 12V to 26V Low quiescent power drain Voltage gain fixed at 50 High peak current capability: 1.3A Input referenced to GND High input impedance: 150kΩ Low distortion: 0.25% (PO =4W, RL =8Ω) Quiescent output voltage is at one half of the supply voltage n Standard dual-in-line package Schematic Diagram DS007843-3 © 2000 National Semiconductor Corporation DS007843 www.national.com LM384 5W Audio Power Amplifier August 2000 LM384 Absolute Maximum Ratings (Note 1) Operating Temperature Lead Temperature (Soldering, 10 sec.) Thermal Resistance θJC θJA If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Peak Current Power Dissipation (See (Notes 4, 5)) Input Voltage Storage Temperature 28V 1.3A 1.67W ± 0.5V −65˚C to +150˚C 0˚C to +70˚C 260˚C 30˚C/W 79˚C/W 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 ZIN Input Resistance IBIAS Bias Current AV Gain POUT Output Power IQ Quiescent Supply Current 8.5 VOUT Q Quiescent Output Voltage 11 BW Bandwidth V+ Supply Voltage ISC Short Circuit Current (Note 6) 1.3 A PSRRRTO Power Supply Rejection Ratio 31 dB 150 Inputs Floating kΩ 100 THD = 10%, RL = 8Ω 40 50 5 5.5 POUT = 2W, RL = 8Ω nA 60 V/V 25 mA W V 450 12 kHz 26 V (Note 3) ) THD Total Harmonic Distortion POUT = 4W, RL = 8Ω 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 CBYPASS = 5 µF, freq = 120 Hz. 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. Heat Sink Dimensions Staver “V7” Heat Sink DS007843-4 Staver Company 41 Saxon Ave. P.O. Drawer H Bay Shore, N.Y. Tel: (516) 666-8000 www.national.com 2 0.25 1.0 % LM384 Typical Performance Characteristics Device Dissipation vs Ambient Temperature Thermal Resistance vs Square Inches Supply Decoupling vs Frequency DS007843-10 DS007843-12 DS007843-11 Total Harmonic Distortion vs Output Power Output Voltage Gain vs Frequency DS007843-13 Power Supply Current vs Supply Voltage Total Harmonic Distortion vs Frequency DS007843-15 DS007843-14 Device Dissipation vs Output Power — 16Ω Load DS007843-16 Device Dissipation vs Output Power — 8Ω Load DS007843-17 3 DS007843-18 www.national.com LM384 Typical Performance Characteristics (Continued) Device Dissipation vs Output Power — 4Ω Load DS007843-19 Block and Connection Diagrams Dual-In-Line Package DS007843-1 DS007843-2 Note 7: Heatsink Pins Top View Order Number LM384N See NS Package Number N14A www.national.com 4 LM384 Typical Applications Typical 5W Amplifier DS007843-6 Bridge Amplifier DS007843-7 Intercom DS007843-8 *For stability with high current loads 5 www.national.com LM384 Typical Applications (Continued) Phase Shift Oscillator DS007843-9 www.national.com 6 LM384 5W Audio Power Amplifier Physical Dimensions inches (millimeters) unless otherwise noted Molded Dual-In-Line Package (N) Order Number LM384N NS Package Number N14A 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. 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