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Part: LM2876DWF
Category:
Multimedia
-> Audio
-> Amplifiers
-> Power Amplifiers
-> Overture Audio Power Amplifiers
Description: LM2876 - High-performance 40 Watt Audio Power Amplifier W/Mute, Package: to 220, Pin Nb=11
Company: National Semiconductor Corporation
Datasheet: Download LM2876DWF datasheet File size : 634 kB
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LM2876 Overture Audio Power Amplifier Series High-Performance 40W Audio Power Amplifier w/Mute
August 2000
LM2876 OvertureTM Audio Power Amplifier Series High-Performance 40W Audio Power Amplifier w/Mute
General Description
The LM2876 is a high-performance audio power amplifier capable of delivering 40W of continuous average power to an 8 load with 0.1% THD+N from 20Hz 20kHz. The performance of the LM2876, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKeTM) 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 LM2876 maintains an excellent signal-to-noise ratio of greater than 95dB (min) with a typical low noise floor of 2.0µV. 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
n n n n n n n 40W continuous average output power into 8 75W 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 Wide supply range 20V - 72V
n n
Applications
n n n n n Component stereo Compact stereo Self-powered speakers Surround-sound amplifiers High-end stereo TVs
Typical Application
DS011775-1
* Optional components dependent upon specific design requirements. Refer to the External Components Description section for a component functional description.
FIGURE 1. Typical Audio Amplifier Application Circuit
OvertureTM and SPiKeTM Protection are trademarks of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS011775
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LM2876
Connection Diagram
DS011775-2
Connect Pin 5 to V+ for Compatibility with LM3886.
*Preliminary: Call your local National sales rep. or distributor for availability.
Top View Order Number LM2876T or LM2876TF See NS Package Number TA11B for Staggered Lead Non-Isolated Package or TF11B* for Staggered Lead Isolated Package
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LM2876
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) Supply Voltage |V+|+|V-| (Input Signal) Common Mode Input Voltage Differential Input Voltage Output Current Power Dissipation (Note 6) ESD Susceptibility (Note 7) Junction Temperature (Note 8) Soldering Information T Package (10 seconds) 72V 70V (V+ or V-) and |V+| + |V-| 60V 60V Internally Limited 125W 3000V 150°C 260°C
Storage Temperature Thermal Resistance JC JA
-40°C to +150°C 1°C/W 43°C/W
Operating Ratings (Notes 4, 5)
Temperature Range TMIN TA TMAX Supply Voltage |V+| + |V-| -20°C TA +85°C 20V to 60V
Note 1: Operation is guaranteed up to 60V, however, distortion may be introduced from SPiKe Protection Circuitry if proper thermal considerations are not taken into account. Refer to the Thermal Considerations section for more information. (See SPiKe Protection Response)
Electrical Characteristics (Notes 4, 5) The following specifications apply for V+ = +30V, V- = -30V, IMUTE = -0.5 mA with RL = 8 unless otherwise specified. Limits apply for TA = 25°C.
Symbol Parameter Conditions LM2876 Typical |V | + |V | AM
+ -
Limit 20 60
Units (Limits)
(Note 9) (Note 10) Power Supply Voltage (Note 13) Mute Attenuation Vpin7 - V 9V
-
18
V (min) V (max) dB (min) W (min) W %
Pin 8 Open or at 0V, Mute: On Current out of Pin 8 > 0.5 mA, Mute: Off 115 40 75 25W, 20 Hz f 20 kHz A V = 26 dB VIN = 1.2 Vrms, f = 10 kHz, Square-Wave, RL = 2 k VCM = 0V, Vo = 0V, Io = 0A VCM = 0V, Io = 0 mA VCM = 0V, Io = 0 mA VCM = 0V, Io = 0 mA |V+| = |V-| = 10V, tON = 10 ms, VO = 0V |V+ VO|, V+ = 20V, Io = +100 mA |VO V-|, V- = -20V, Io = -100 mA V+ = 30V to 10V, V- = -30V, VCM = 0V, Io = 0 mA V+ = 30V, V- = -30V to -10V, VCM = 0V, Io = 0 mA 110 110 115 8 85 75 80 2 dB (min) dB (min) dB (min) MHz (min) 0.06 9 24 1 0.2 0.01 4 1.5 2.5 125 5 50 10 1 0.2 3 4 4 85 80 25
PO (Note 3) Peak PO THD + N SR (Note 3) I+ (Note 2) VOS (Note 2) IB IOS Io Vod (Note 2) PSRR (Note 2)
Output Power (Continuous Average) Instantaneous Peak Output Power Total Harmonic Distortion Plus Noise Slew Rate (Note 12) Total Quiescent Power Supply Current Input Offset Voltage Input Bias Current Input Offset Current Output Current Limit Output Dropout Voltage (Note 14) Power Supply Rejection Ratio
THD + N = 0.1% (max) f = 1 kHz; f = 20 kHz
V/µs (min) mA (max) mV (max) µA (max) µA (max) A (min) V (max) V (max) dB (min)
CMRR (Note 2) AVOL (Note 2) GBWP
Common Mode Rejection Ratio Open Loop Voltage Gain Gain-Bandwidth Product
V+ = 50V to 10V, V- = -10V to -50V, VCM = 20V to -20V, Io = 0 mA |V+| = |V-| = 30V, RL = 2 k, VO = 40V |V+| = |V-| = 30V fO = 100 kHz, VIN = 50 mVrms
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