LM1877Dual Audio Power AmplifierGeneral DescriptionThe LM1877 is a monolithic dual power amplifier designed todeliver 2W/channel continuous into 8Ω loads. The LM1877 isdesigned to operate with a low number of external compo-nents, and still provide flexibility for use in stereo phono-graphs, tape recorders and AM-FM stereo receivers, etc.Each power amplifier is biased from a common internal regu-lator to provide high power supply rejection, and output Qpoint centering. The LM1877 is internally compensated forall gains greater than 10.

Featuresn 2W/channeln −65 dB ripple rejection, output referredn −65 dB channel separation, output referred

n Wide supply range, 6V–24Vn Very low cross-over distortionn Low audio band noisen AC short circuit protectedn Internal thermal shutdown

Applicationsn Multi-channel audio systemsn Stereo phonographsn Tape recorders and playersn AM-FM radio receiversn Servo amplifiersn Intercom systemsn Automotive products

Connection Diagram

Dual-In-Line Packageor Surface Mount Package

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Top ViewOrder Number LM1877M-9 or LM1877N-9See NS Package Number M14B or N14A

February 1995

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Equivalent Schematic Diagram

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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 26VInput Voltage ±0.7VOperating Temperature 0˚C to +70˚CStorage Temperature −65˚C to +150˚CJunction Temperature 150˚CLead Temperature

N-Package Soldering (10 sec.) 260˚C

M-Package Infared (15 sec.) 220˚CM-Package Vapor Phase (60 sec.) 215˚C

Thermal ResistanceθJC (N-Package) 30˚C/WθJA (N-Package) 79˚C/WθJC (M-Package) 27˚C/WθJA (M-Package) 114˚C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage tothe device may occur. Operating Ratings indicate conditions for which the de-vice is functional, but do not guarantee specific performance limits.

Electrical CharacteristicsVS = 20V, TA = 25˚C, (Note 2) RL = 8Ω, AV = 50 (34 dB) unless otherwise specified

Parameter Conditions Min Typ Max Units

Total Supply Current PO = 0W 25 50 mA

Output Power THD = 10%

LM1877 VS = 20V, RL = 8Ω 2.0 W/Ch

VS = 12V, RL = 8Ω 1.3 W/Ch

Total Harmonic Distortion

LM1877 f = 1 kHz, VS = 14V

PO = 50 mW/Channel 0.075 %

PO = 500 mW/Channel 0.045 %

PO = 1 W/Channel 0.055 %

Output Swing RL = 8Ω VS −6 Vp-p

Channel Separation CF = 50 µF, CIN = 0.1 µF,

f = 1 kHz, Output Referred

VS = 20V, VO = 4 Vrms −50 −70 dB

VS = 7V, VO = 0.5 Vrms −60 dB

PSRR Power Supply CF = 50 µF, CIN = 0.1 µF,

Rejection Ratio f = 120 Hz, Output Referred

VS = 20V, VRIPPLE = 1 Vrms −50 −65 dB

VS = 7V, VRIPPLE = 0.5 Vrms −40 dB

Noise Equivalent Input Noise

RS = 0, CIN = 0.1 µF, 2.5 µV

BW = 20 Hz–20 kHz, Output Noise Wideband

RS = 0, CN = 0.1 µF, AV 200 0.80 mV

Open Loop Gain RS = 0, f = 100 kHz, RL = 8Ω 70 dB

Input Offset Voltage 15 mV

Input Bias Current 50 nA

Input Impedance Open Loop 4 MΩDC Output Level VS = 20V 9 10 11 V

Slew Rate 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.

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Typical Performance Characteristics

Device Dissipation vsAmbient Temperature

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Power Supply Rejection Ratio(Referred to the Output) vsFrequency

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Power Supply Rejection Ratio(Referred to the Output) vsFrequency

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Power Supply Rejection Ratio(Referred to the Output) vsSupply Voltage

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Channel Separation (Referredto the Output) vs Frequency

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Channel Separation (Referredto the Output) vs Frequency

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Average Supply Current vsPOUT

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Total Harmonic Distortionvs Frequency

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Total Harmonic Distortionvs Frequency

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Typical Performance Characteristics (Continued)

Typical Applications

Power Dissipation (W)Both Channels Operating

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Open Loop Gain vsFrequency

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Output Swing vs SupplyVoltage

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Stereo Phonograph Amplifier with Bass Tone Control

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Typical Applications (Continued)

Frequency Response of Bass Tone Control

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Inverting Unity Gain Amplifier

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Stereo Amplifier with A V = 200

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Typical Applications (Continued)

Non-Inverting Amplifier Using Split Supply

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Typical Split Supply

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Physical Dimensions inches (millimeters) unless otherwise noted

Molded SOIC Package (M)Order Number LM1877M-9NS Package Number M14B

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERALCOUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices orsystems which, (a) are intended for surgical implantinto the body, or (b) support or sustain life, andwhose failure to perform when properly used inaccordance with instructions for use provided in thelabeling, can be reasonably expected to result in asignificant injury to the user.

2. A critical component is any component of a lifesupport device or system whose failure to performcan be reasonably expected to cause the failure ofthe life support device or system, or to affect itssafety or effectiveness.

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Molded Dual-In-Line Package (N)Order Number LM1877N-9NS Package Number N14A

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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.