lm384 5w audio power amplifier general description the lm384 is a power audio amplifier for consumer applica- tions. in order to hold system cost to a minimum, gain is in- ternally 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 com- prising 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 driv- ers, tv sound systems, am-fm radio, sound projector sys- tems, etc. see an-69 for circuit details. features n wide supply voltage range: 12v to 26v n low quiescent power drain n voltage gain fixed at 50 n high peak current capability: 1.3a n input referenced to gnd n high input impedance: 150k w n low distortion: 0.25% (p o =4w, r l =8 w ) n quiescent output voltage is at one half of the supply voltage n standard dual-in-line package schematic diagram ds007843-3 august 2000 lm384 5w audio power amplifier ? 2000 national semiconductor corporation ds007843 www.national.com
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 28v peak current 1.3a power dissipation (see (notes 4, 5)) 1.67w input voltage 0.5v storage temperature ?65c to +150c operating temperature 0c to +70c lead temperature (soldering, 10 sec.) 260c thermal resistance q jc 30c/w q ja 79c/w note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the de- vice is functional, but do not guarantee specific performance limits. electrical characteristics (note 2) symbol parameter conditions min typ max units z in input resistance 150 k w i bias bias current inputs floating 100 na a v gain 40 50 60 v/v p out output power thd = 10%, r l =8 w 5 5.5 w i q quiescent supply current 8.5 25 ma v out q quiescent output voltage 11 v bw bandwidth p out = 2w, r l =8 w 450 khz v + supply voltage 12 26 v i sc short circuit current (note 6) 1.3 a psrr rto power supply rejection ratio 31 db (note 3) ) thd total harmonic distortion p out = 4w, r l =8 w 0.25 1.0 % note 2: v + = 22v and t a = 25c operating with a staver v7 heat sink for 30 seconds. note 3: rejection ratio referred to the output with c bypass = 5 f, freq = 120 hz. note 4: the maximum junction temperature of the lm384 is 150c. note 5: the package is to be derated at 15c/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 av7o heat sink ds007843-4 staver company 41 saxon ave. p.o. drawer h bay shore, n.y. tel: (516) 666-8000 lm384 www.national.com 2
typical performance characteristics device dissipation vs ambient temperature ds007843-10 thermal resistance vs square inches ds007843-11 supply decoupling vs frequency ds007843-12 total harmonic distortion vs output power ds007843-13 output voltage gain vs frequency ds007843-14 total harmonic distortion vs frequency ds007843-15 power supply current vs supply voltage ds007843-16 device dissipation vs output power e 16 w load ds007843-17 device dissipation vs output power e 8 w load ds007843-18 lm384 www.national.com 3
typical performance characteristics (continued) block and connection diagrams device dissipation vs output power e 4 w load ds007843-19 ds007843-1 dual-in-line package ds007843-2 note 7: heatsink pins top view order number LM384N see ns package number n14a lm384 www.national.com 4
typical applications typical 5w amplifier ds007843-6 bridge amplifier ds007843-7 intercom ds007843-8 *for stability with high current loads lm384 www.national.com 5
typical applications (continued) phase shift oscillator ds007843-9 lm384 www.national.com 6
physical dimensions inches (millimeters) unless otherwise noted 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 labeling, can be reasonably expected to result in a significant injury to the user. 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. national semiconductor corporation americas tel: 1-800-272-9959 fax: 1-800-737-7018 email: support@nsc.com national semiconductor europe fax: +49 (0) 180-530 85 86 email: europe.support@nsc.com deutsch tel: +49 (0) 69 9508 6208 english tel: +44 (0) 870 24 0 2171 fran?ais tel: +33 (0) 1 41 91 8790 national semiconductor asia pacific customer response group tel: 65-2544466 fax: 65-2504466 email: ap.support@nsc.com national semiconductor japan ltd. tel: 81-3-5639-7560 fax: 81-3-5639-7507 www.national.com molded dual-in-line package (n) order number LM384N ns package number n14a lm384 5w audio power amplifier national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the righ t at any time without notice to change said circuitry and specifications.
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