Monday, August 16, 2010

Exploring power amplifier integrated circuit LM4780 from National Semiconductor.

What's so special? Well, first of all - a very low harmonic distortion. Usually, manufacturers indicate the maximum power of its regular ingenious handicrafts with the harmonic content of 10%. At the same chip, CT at the maximum specified power is only 0,5%! Thus, it is the most honest of all mikruha I encountered.

In the chip implements two identical amplifier channels and features are given for the stereo mode of the amplifier. Circuit can also operate in mono - in bridge inclusion. In this case, the output power at CT = 0.5% of 120 watts. Other features remain virtually unchanged.

rangakain amplifier 60W stereo  LM4780
Skema rangakain amplifier 60W stereo LM4780

rangakain amplifier 120W Bridged LM4780Skema rangakain amplifier 120W Bridged LM4780

LM4780 IC Fiture
  • Features SPiKe Protection
  • Low external component count
  • Quiet fade-in/out mute mode
  • Wide supply range: 20V - 84V
  • Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W)
LM4780 IC pinLM4780 IC pin

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