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 Features Y Y Y Y Y Y Y Y Applications Y Y Y AVO typical 90 dB 9W per channel (typical) 60 dB ripple rejection 70 dB channel separation Self-centering biasing 4 MX input impedance Internal current limiting Internal thermal protection Y Y Y Y Y Y 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 Stereo Amplifier Plastic Package 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. LM2879 Dual 8W Audio Amplifier February 1995 Absolute Maximum Ratings Storage Temperature Junction Temperature Lead Temp. (Soldering, 10 seconds) ESD rating to be determined. Thermal Resistance iJC iJA 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 b 65§ C to a 150§ C 150§ C 260§ C 1§ C/W 43§ C/W Electrical Characteristics VS e 28V, TTAB e 25§ C, RL e 8X, AV e 50 (34 dB), unless otherwise specified. Parameter Total Supply Current Conditions Min PO e 0W Operating Supply Voltage f e 1 kHz, THD e 10%, TTAB e 25§ C Distortion f e 1 kHz, RL e 8X PO e 1 W/Channel Output Swing RL e 8X Channel Separation 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 Common-Mode Range Split Supplies g 15V, Pin 1 Tied to Pin 11 Input Offset Voltage 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 Open Loop Gain Units 65 mA 6 32 RS e 51X, f e 1 kHz, RL e 8X Input Bias Current V 8 W 0.05 PSRR Negative Supply Noise Max 12 6 Output Power/Channel PSRR Positive Supply Typ 1 % VSb6V Vp-p b 50 b 70 dB b 50 b 60 dB b 60 dB g 13.5 V 10 mV 2.5 3.0 0.8 mV mV mV 70 dB 100 nA MX Input Impedance Open Loop 4 DC Output Voltage VS e 28V 14 V 2 V/ms 65 kHz 1.5 A Slew Rate Power Bandwidth 3 dB Bandwidth at 2.5W 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 (Continued) Supply Current vs Output Power Supply Rejection vs Frequency Channel Separation (Referred to the Output) 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 TL/H/5291 – 5 Equivalent Schematic Diagram 4 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. 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