LM3875 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – OverturTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier

LM3875
www.ti.com
SNAS083D – JUNE 1999 – REVISED APRIL 2013
LM3875 Overture™ Audio Power Amplifier Series
High-Performance 56W Audio Power Amplifier
Check for Samples: LM3875
FEATURES
1
•23 56W Continuous Average Output Power Into
8Ω
• 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 PFM Package
• Wide Supply Voltage Range: |V+| + |V−| = 20V
to 84V
APPLICATIONS
• Component or Compact Stereos
• Self-Powered Speakers
• Surround-Sound Amplifiers
• High-End Stereo TVs
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
20Hz to 20kHz.
The performance of the LM3875, 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, 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%.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Overture is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2013, Texas Instruments Incorporated