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LM3875 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3875
Description  OverturTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3875 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM3875 OvertureAudio 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
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%.
56W continuous average output power into 8
100W instantaneous peak output power capability
Signal-to-Noise Ratio >95dB (min)
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 |V+| + |V−|
≤ 12V, thus eliminating
turn-on and turn-off transients
11 lead TO-220 package
Wide supply voltage range: |V+| + |V−| = 20V to 84V
Component or compact stereos
Self-powered speakers
Surround-sound amplifiers
High-end stereo TVs
Typical Application
Overtureand SPiKeare trademarks of National Semiconductor Corporation.
*Optional components dependent upon specific design requirements. Refer to the External Components Description section for a component function
FIGURE 1. Typical Audio Amplifier Application Circuit
August 2000
© 2004 National Semiconductor Corporation

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