LM1877 Dual Audio Power Amplifier General Description The LM1877 is a monolithic dual power amplifier designed to deliver 2W/channel continuous into 8Ω loads. The LM1877 is designed to operate with a low number of external components, and still provide flexibility for use in stereo phonographs, tape recorders and AM-FM stereo receivers, etc. Each power amplifier is biased from a common internal regulator to provide high power supply rejection, and output Q point centering. The LM1877 is internally compensated for all gains greater than 10. Features n 2W/channel n −65 dB ripple rejection, output referred n −65 dB channel separation, output referred n n n n n Wide supply range, 6V–24V Very low cross-over distortion Low audio band noise AC short circuit protected Internal thermal shutdown Applications n n n n n n n Multi-channel audio systems Stereo phonographs Tape recorders and players AM-FM radio receivers Servo amplifiers Intercom systems Automotive products Connection Diagram Dual-In-Line Package or Surface Mount Package DS007913-1 Top View Order Number LM1877M-9 or LM1877N-9 See NS Package Number M14B or N14A © 1999 National Semiconductor Corporation DS007913 www.national.com LM1877 Dual Audio Power Amplifier February 1995 Equivalent Schematic Diagram DS007913-2 www.national.com 2 Absolute Maximum Ratings (Note 1) M-Package Infared (15 sec.) M-Package Vapor Phase (60 sec.) Thermal Resistance θJC (N-Package) θJA (N-Package) θJC (M-Package) θJA (M-Package) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Operating Temperature Storage Temperature Junction Temperature Lead Temperature N-Package Soldering (10 sec.) 26V ± 0.7V 0˚C to +70˚C −65˚C to +150˚C 150˚C 220˚C 215˚C 30˚C/W 79˚C/W 27˚C/W 114˚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. 260˚C Electrical Characteristics VS = 20V, TA = 25˚C, (Note 2) RL = 8Ω, AV = 50 (34 dB) unless otherwise specified Parameter Total Supply Current Output Power LM1877 Conditions Min PO = 0W THD = 10% VS = 20V, RL = 8Ω VS = 12V, RL = 8Ω Typ Max Units 25 50 mA 2.0 W/Ch 1.3 W/Ch 0.075 % 0.045 % Total Harmonic Distortion LM1877 Output Swing Channel Separation PSRR Power Supply Rejection Ratio Noise Open Loop Gain f = 1 kHz, VS = 14V PO = 50 mW/Channel PO = 500 mW/Channel PO = 1 W/Channel RL = 8Ω CF = 50 µF, CIN = 0.1 µF, f = 1 kHz, Output Referred VS = 20V, VO = 4 Vrms −50 VS = 7V, VO = 0.5 Vrms CF = 50 µF, CIN = 0.1 µF, f = 120 Hz, Output Referred VS = 20V, VRIPPLE = 1 Vrms VS = 7V, VRIPPLE = 0.5 Vrms −50 Equivalent Input Noise RS = 0, CIN = 0.1 µF, BW = 20 Hz–20 kHz, Output Noise Wideband RS = 0, CN = 0.1 µF, AV 200 RS = 0, f = 100 kHz, RL = 8Ω Input Offset Voltage Input Bias Current Input Impedance DC Output Level Open Loop VS = 20V 9 Slew Rate 0.055 % VS −6 Vp-p −70 dB −60 dB −65 dB −40 dB 2.5 µV 0.80 mV 70 dB 15 mV 50 nA 4 MΩ 10 11 V 2.0 V/µs Power Bandwidth 65 kHz Current Limit 1.0 A Note 2: For operation at ambient temperature greater than 25˚C, the LM1877 must be derated based on a maximum 150˚C junction temperature. 3 www.national.com Typical Performance Characteristics Device Dissipation vs Ambient Temperature Power Supply Rejection Ratio (Referred to the Output) vs Frequency Power Supply Rejection Ratio (Referred to the Output) vs Frequency DS007913-10 DS007913-11 Power Supply Rejection Ratio (Referred to the Output) vs Supply Voltage Channel Separation (Referred to the Output) vs Frequency DS007913-12 Channel Separation (Referred to the Output) vs Frequency DS007913-14 DS007913-15 DS007913-13 Average Supply Current vs POUT Total Harmonic Distortion vs Frequency DS007913-16 www.national.com Total Harmonic Distortion vs Frequency DS007913-17 4 DS007913-18 Typical Performance Characteristics Power Dissipation (W) Both Channels Operating (Continued) Open Loop Gain vs Frequency Output Swing vs Supply Voltage DS007913-21 DS007913-20 DS007913-19 Typical Applications Stereo Phonograph Amplifier with Bass Tone Control DS007913-4 5 www.national.com Typical Applications (Continued) Inverting Unity Gain Amplifier Frequency Response of Bass Tone Control DS007913-5 DS007913-6 Stereo Amplifier with AV = 200 DS007913-7 www.national.com 6 Typical Applications (Continued) Typical Split Supply Non-Inverting Amplifier Using Split Supply DS007913-9 DS007913-8 7 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Molded SOIC Package (M) Order Number LM1877M-9 NS Package Number M14B www.national.com 8 LM1877 Dual Audio Power Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM1877N-9 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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