Power amplifier 60/120 watts on the LM4780 chip. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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We study the power amplifier on an integrated circuit LM4780 from National Semiconductor.

What is special about her? Well, first of all - it is a very low level of harmonic distortion. Usually, manufacturers indicate the maximum power of their next ingenious craft at a harmonic coefficient of 10%. For the same microcircuit, the KG at the maximum specified power is only 0,5%! Thus, this is the most honest mikruha I have ever met.

The main characteristics of the microcircuit are as follows:

The microcircuit has two identical amplification channels and the characteristics are given for the stereo mode of the amplifier. The microcircuit can also work in mono mode - in a bridged connection. In this case, the output power at KG=0,5% will be 120 watts. The rest of the characteristics remain practically unchanged.

We look at the wiring diagrams.

Switching on in dual channel mode

Switching on in bridged mode

There are not too many attachments and they are all easy to get. The microcircuit is produced in the TO-220 package, beloved by all mankind, and is remarkably mounted on a radiator. The radiator, of course, will have to be used very sickly, but what can you do - this is not class D for you.

Element plate (two-channel circuit)

Publication: radiokot.ru

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