LM1877 LM1877 Dual Audio Power Amplifier Literature Number: SNAS550A LM1877 Dual Audio Power Amplifier General Description The LM1877 is a monolithic dual power amplifier designed to deliver 2W/channel continuous into 8 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 00791301 Top View Order Number LM1877M-9 or LM1877N-9 See NS Package Number M14B or N14A (c) 2004 National Semiconductor Corporation DS007913 www.national.com LM1877 Dual Audio Power Amplifier February 1995 LM1877 Equivalent Schematic Diagram 00791302 www.national.com 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 220C M-Package Vapor Phase (60 sec.) 215C Thermal Resistance JC (N-Package) 30C/W 26V JA (N-Package) 79C/W 0.7V JC (M-Package) 27C/W 0C to +70C JA (M-Package) 114C/W Supply Voltage Input Voltage Operating Temperature M-Package Infared (15 sec.) Storage Temperature -65C to +150C Junction Temperature 150C 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. Lead Temperature N-Package Soldering (10 sec.) 260C Electrical Characteristics VS = 20V, TA = 25C, (Note 2) RL = 8, AV = 50 (34 dB) unless otherwise specified Parameter Conditions Total Supply Current PO = 0W Output Power THD = 10% LM1877 VS = 20V, RL = 8 Min Typ Max Units 25 50 mA 2.0 VS = 12V, RL = 8 W/Ch 1.3 W/Ch PO = 50 mW/Channel 0.075 % PO = 500 mW/Channel 0.045 % Total Harmonic Distortion LM1877 f = 1 kHz, VS = 14V PO = 1 W/Channel 0.055 % Output Swing RL = 8 VS -6 Vp-p Channel Separation CF = 50 F, CIN = 0.1 F, f = 1 kHz, Output Referred VS = 20V, VO = 4 Vrms -50 VS = 7V, VO = 0.5 Vrms PSRR Power Supply CF = 50 F, CIN = 0.1 F, Rejection Ratio f = 120 Hz, Output Referred VS = 20V, VRIPPLE = 1 Vrms -50 dB dB -65 dB -40 dB 2.5 V RS = 0, CN = 0.1 F, AV 200 0.80 mV RS = 0, f = 100 kHz, RL = 8 VS = 7V, VRIPPLE = 0.5 Vrms Noise -70 -60 Equivalent Input Noise RS = 0, CIN = 0.1 F, BW = 20 Hz-20 kHz, Output Noise Wideband Open Loop Gain 70 dB Input Offset Voltage 15 mV Input Bias Current 50 nA Input Impedance Open Loop DC Output Level VS = 20V 4 9 10 M 11 V Slew Rate 2.0 V/s Power Bandwidth 65 kHz Current Limit 1.0 A Note 2: For operation at ambient temperature greater than 25C, the LM1877 must be derated based on a maximum 150C junction temperature. 3 www.national.com LM1877 Absolute Maximum Ratings (Note 1) LM1877 Typical Performance Characteristics Power Supply Rejection Ratio (Referred to the Output) vs Frequency Device Dissipation vs Ambient Temperature 00791311 00791310 Power Supply Rejection Ratio (Referred to the Output) vs Frequency Power Supply Rejection Ratio (Referred to the Output) vs Supply Voltage 00791312 00791313 Channel Separation (Referred to the Output) vs Frequency Channel Separation (Referred to the Output) vs Frequency 00791314 www.national.com 00791315 4 LM1877 Typical Performance Characteristics (Continued) Average Supply Current vs POUT Total Harmonic Distortion vs Frequency 00791317 00791316 Total Harmonic Distortion vs Frequency Power Dissipation (W) Both Channels Operating 00791318 00791319 Open Loop Gain vs Frequency Output Swing vs Supply Voltage 00791321 00791320 5 www.national.com LM1877 Typical Applications Stereo Phonograph Amplifier with Bass Tone Control 00791304 Frequency Response of Bass Tone Control Inverting Unity Gain Amplifier 00791305 00791306 www.national.com 6 LM1877 Typical Applications (Continued) Stereo Amplifier with AV = 200 00791307 Non-Inverting Amplifier Using Split Supply Typical Split Supply 00791309 00791308 7 www.national.com LM1877 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 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. 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