Saturday, January 21, 2012

2x6W Stereo Audio Amplifier based LA4440 Power IC

2x6W Audio Amplifier based LA4440 Power IC

This is the diagram of 2x6W stereo audio amplifier based LA4440 power IC. Actually, the LA4440 can be used in both stereo mode and mono (bridge) mode, but the circuit presented in this post is LA4440 in stereo mode. The recommended power supply is 13.2V, while the maximum voltage rated at 18V.

LA4440 Features:
  • Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications.
    • Dual : 6W´2 (typ.)
    • Bridge : 19W (typ.)
  • Minimum number of external parts required.
  • Small pop noise at the time of power supply ON/OFF and good starting balance.
  • Good channel separation.
  • Good ripple rejection : 46dB (typ.)
  • Low distortion over a wide range from low frequencies to high frequencies.
  • Small residual noise (Rg=0).
  • Easy to design radiator fin.
  • Built-in protectors.
  • Built-in audio muting function.
    • Thermal protector
    • Overvoltage, surge voltage protector
    • Pin-to-pin short protector

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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