LM2879T

LM2879 Dual 8W Audio Amplifier February 1995 LM2879 Dual 8W Audio Amplifier General Description The LM2879 is a monolithic dual power amplifier which offers high quality performance for stereo phonographs tape players recorders AM-FM stereo receivers etc The LM2879 will deliver 8W channel to an 8X load The amplifier is designed to operate with a minimum of external components and contains an internal bias regulator to bias each amplifier Device overload protection consists of both internal current limit and thermal shutdown Y Y Y Y Self-centering biasing 4 MX input impedance Internal current limiting Internal thermal protection Applications Y Y Y Y Y Y Y Y Y Y Features Y Y Y Y AVO typical 90 dB 9W per channel (typical) 60 dB ripple rejection 70 dB channel separation Multi-channel audio systems Tape recorders and players Movie projectors Automotive systems Stereo phonographs Bridge output stages AM-FM radio receivers Intercoms Servo amplifiers Instrument systems Connection Diagram and Typical Application Plastic Package Stereo Amplifier TL H 5291 – 1 Order Number LM2879T See NS Package Number TA11B TAB must be connected to GND TL H 5291 – 2 FIGURE 1 C1995 National Semiconductor Corporation TL H 5291 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage (Note 1) Operating Temperature (Note 2) 35V g 0 7V 0 C to a 70 C Storage Temperature Junction Temperature Lead Temp (Soldering 10 seconds) ESD rating to be determined Thermal Resistance iJC iJA b 65 C to a 150 C 150 C 260 C 1C W 43 C W Electrical Characteristics VS e 28V Parameter Total Supply Current Operating Supply Voltage Output Power Channel Distortion Output Swing Channel Separation PO e 0W TTAB e 25 C RL e 8X AV e 50 (34 dB) unless otherwise specified Min 6 Typ 12 6 8 0 05 VSb6V b 50 b 70 Conditions Max 65 32 Units mA V W f e 1 kHz THD e 10% TTAB e 25 C f e 1 kHz RL e 8X PO e 1 W Channel RL e 8X CBYPASS e 50 mF CIN e 0 1 mF f e 1 kHz Output Referred VO e 4 Vrms CBYPASS e 50 mF CIN e 0 1 mF f e 120 Hz Output Referred Vripple e 1 Vrms Measured at DC Input Referred Split Supplies g 15V Pin 1 Tied to Pin 11 Equivalent Input Noise RS e 0 CIN e 0 1 mF BW e 20 b20 kHz CCIR  ARM Output Noise Wideband RS e 0 CIN e 0 1 mF AV e 200 RS e 51X f e 1 kHz RL e 8X Open Loop VS e 28V 3 dB Bandwidth at 2 5W 1 % Vp-p dB PSRR Positive Supply b 50 b 60 b 60 g 13 5 dB dB V mV PSRR Negative Supply Common-Mode Range Input Offset Voltage Noise 10 25 30 08 70 100 4 14 2 65 15 mV mV mV dB nA MX V V ms kHz A Open Loop Gain Input Bias Current Input Impedance DC Output Voltage Slew Rate Power Bandwidth Current Limit Note 1 The input voltage range is normally limited to g 0 7V with respect to pin 1 This range may be extended by shorting pin 1 to the positive supply Note 2 For operation at ambient temperature greater than 25 C the LM2879 must be derated based on a maximum 150 C junction temperature Thermal resistance junction to case is 3 C W Thermal resistance case to ambient is 40 C W Typical Performance Characteristics Device Dissipation vs Ambient Temperature Open Loop Gain vs Frequency Power Dissipation vs Power Output TL H 5291 – 3 2 Typical Performance Characteristics Supply Current vs Output Power (Continued) Channel Separation (Referred to the Output) Frequency Supply Rejection vs Frequency Total Harmonic Distortion vs Frequency Total Harmonic Distortion vs Frequency Output Swing vs VS Total Harmonic Distortion vs Power Output Power Output Channel vs Supply Voltage TL H 5291 – 4 3 4 TL H 5291 – 5 Equivalent Schematic Diagram Typical Applications Two-Phase Motor Drive TL H 5291 – 6 12W Bridge Amplifier TL H 5291 – 7 5 Typical Applications (Continued) Simple Stereo Amplifier with Bass Boost TL H 5291 – 8 Power Op Amp (Using Split Supplies) TL H 5291 – 9 6 Typical Applications (Continued) Stereo Phonograph Amplifier with Bass Tone Control TL H 5291 – 10 Frequency Response of Bass Tone Control TL H 5291 – 11 7 LM2879 Dual 8W Audio Amplifier Physical Dimensions inches (millimeters) 11-Lead TO-220 Power Package (T) Order Number LM2879T NS Package Number TA11B 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 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 National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 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 Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 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