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LM3876 Overture™

Audio Power Amplifier Series

High-Performance 56W Audio Power Amplifier w/Mute

General Description

The LM3876 is a high-performance audio power amplifier capable of delivering 56W of continuous average power to an 8Ω load with 0.1% (THD + N) from 20 Hz–20 kHz.

The performance of the LM3876, utilizing its Self Peak Instantaneous Temperature (˚Ke) (SPiKe™) Protection Circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe Protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.

The LM3876 maintains an excellent Signal-to-Noise Ratio of greater than 95 dB(min) with a typical low noise floor of 2.0 µV. It exhibits extremely low (THD + N) values of 0.06% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

Features

• 56W continuous average output power into 8Ω
• 100W instantaneous peak output power capability
• Signal-to-Noise Ratio ≥ 95 dB(min)
• An input mute function
• Output protection from a short to ground or to the supplies via internal current limiting circuitry
• Output over-voltage protection against transients from inductive loads
• Supply under-voltage protection, not allowing internal biasing to occur when |VEE| + |VCC| ≤ 12V, thus eliminating turn-on and turn-off transients
• 11-lead TO-220 package

Applications

• Component stereo
• Compact stereo
• Self-powered speakers
• Surround-sound amplifiers
• High-end stereo TVs

Absolute Maximum Ratings (Notes 4, 5)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage |V+ |+|V− | (No Signal) 94V

Supply Voltage |V+ |+|V− | (Input Signal) 84V

Common Mode Input Voltage (V+ or V− ) and |V+ | + |V− | ≤80V

Differential Input Voltage 60V

Output Current Internally Limited

Power Dissipation (Note 6) 125W

ESD Susceptibility (Note 7) 3000V

Junction Temperature (Note 8) 150˚C

Soldering Information T Package (10 seconds) 260˚C

Storage Temperature −40˚C to +150˚C

Thermal Resistance θ_JC 1˚C/W

θ_JA 43˚C/W

Operating Ratings (Notes 4, 5)

Temperature Range T_MIN ≤ T_A ≤ T_MAX −20˚C ≤ TA ≤ +85˚C

Supply Voltage |V+ | + |V− | 24V to 84V

Note 4: All voltages are measured with respect to the GND pin (pin 7), unless otherwise specified.

Note 5: 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. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.

Note 6: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of θJC = 1.0 ˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.

Note 7: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 8: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.

Typical Application

Connection Diagram

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