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LM3875 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3875 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 20 page LM3875 Overture™ Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier General Description The LM3875 is a high-performance audio power amplifier capable of delivering 56W of continuous average power to an 8 Ω load with 0.1% THD+N from 20Hz to 20kHz. The performance of the LM3875, utilizing its Self Peak In- stantaneous Temperature (˚Ke) (SPiKe™) protection cir- cuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Op- erating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against ov- ervoltage, undervoltage, overloads, caused by shorts to the supplies, thermal runaway, and instantaneous temperature peaks. The LM3875 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 56W continuous average output power into 8 Ω n 100W instantaneous peak output power capability n Signal-to-Noise Ratio >95dB (min) n Output protection from a short to ground or to the supplies via internal current limiting circuitry n Output over-voltage protection against transients from inductive loads n Supply under-voltage protection, not allowing internal biasing to occur when |V+| + |V−| ≤ 12V, thus eliminating turn-on and turn-off transients n 11 lead TO-220 package n Wide supply voltage range: |V+| + |V−| = 20V to 84V Applications n Component or compact stereos n Self-powered speakers n Surround-sound amplifiers n High-end stereo TVs Typical Application Overture™ and SPiKe™ are trademarks of National Semiconductor Corporation. 01144901 *Optional components dependent upon specific design requirements. Refer to the External Components Description section for a component function description. FIGURE 1. Typical Audio Amplifier Application Circuit August 2000 © 2004 National Semiconductor Corporation DS011449 www.national.com |
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