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LM3875T

更新时间： 2024-11-28 22:51:51
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19页 535K
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LM3875 Overture⑩ Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier

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June 1999  
™
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 8Ω load with 0.1% (THD + N) from 20 Hz–20 kHz.  
Features  
n 56W continuous average output power into 8Ω  
n 100W instantaneous peak output power capability  
n Signal-to-Noise Ratio 95 dB (min)  
>
The performance of the LM3875, utilizing its Self Peak In-  
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 |VEE| + |VCC| ≤ 12V, thus  
eliminating turn-on and turn-off transients  
n 11 lead TO-220 package  
™
stantaneous Temperature (˚Ke) (SPiKe ) Protection Cir-  
cuitry, puts it in a class above discrete and hybrid amplifiers  
by providing an inherently, dynamically protected Safe Oper-  
ating Area (SOA). SPiKe Protection means that these parts  
are completely safeguarded at the output against overvolt-  
age, undervoltage, overloads, including shorts to the sup-  
plies, thermal runaway, and instantaneous temperature  
peaks.  
The LM3875 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 spec-  
trum, and provides excellent linearity with an IMD (SMPTE)  
typical rating of 0.004%.  
Applications  
n Component stereo  
n Compact stereo  
n Self-powered speakers  
n Surround-sound amplifiers  
n High-end stereo TVs  
Typical Application  
DS011449-1  
*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  
™
™
Overture and SPiKe Protection are trademarks of National Semiconductor Corporation.  
© 1999 National Semiconductor Corporation  
DS011449  
www.national.com  
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