Integrated amplifier

Publié le par uwumukiza

LM3875 high audio Amplifier

The LM3875 is a high-performance audio power amplifier capable of delivering 56W of continuous average power to an 8 load. 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.
This amplifier circuit is based on the standard non-inverted GainClone configuration. I did some calucaltions on the feedback resistor and other components in order to check the gain etc. Please find some more background on the calculations relevant for GainClones on the background section
Parameters IC LM3875

Output Current 6000 mA.
Offset Voltage max, 25C 10 mV.
Gain Bandwidth 8 MHz.
Supply Min 20 Volt.
Supply Max 84 Volt.
Supply Current Per Channel 30 mA.
PowerWise Rating 2 3750 uA/MHz.
Slew Rate 11 Volts/usec.
Input OutputType Not Rail to Rail.
Max Input Bias Current 1000 nA.
Special Features AvCl>10.
Function Op Amp.
Channels 1 Channels.
Temperature Min 0 deg C.
Temperature Max 70 deg C.

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