Audio Amplifier Based on LM3886

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ling1995
Posts: 3
Joined: Thu Mar 16, 2017 6:27 am

Audio Amplifier Based on LM3886

Post by ling1995 » Fri Sep 08, 2017 9:32 am

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.
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schematic
The performance of the LM3886, 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, under voltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.
LM3886T/NOPB Datasheet
The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0µV. It exhibits extremely low THD+N values of 0.03% 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%.
parts list:
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Features:
  • 68W Cont. Avg. Output Power into 4Ω at VCC = ±28V
    38W Cont. Avg. Output Power into 8Ω at VCC = ±28V
    50W Cont. Avg. Output Power into 8Ω at VCC = ±35V
    135W Instantaneous Peak Output Power Capability
    Signal-to-Noise Ratio ≥ 92dB
    An Input Mute Function ( J1 & J2 Jumper)
    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
    Input Slandered Audio Line signal
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photo

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