It is a component that provides power for the playback device, and it is also one of the important links related to sound quality. The power amplifier chip is just like the “heart” of the multimedia playback device. Analog audio power amplifier usually has class A, class B, class AB, class G, class H TD power amplifier, and digital circuit power amplifier is divided into class D and class t. For the audio power amplifier circuit, we also need to pay attention to the above problems.Īccording to the different conductive modes of amplification circuits, audio power amplifier circuits are classified according to analog and digital types. The specific performance is as follows: ① the output power should be as large as possible ② It usually works under the condition of large signal ③ Prominent nonlinear distortion ④ Improving efficiency is an important concern ⑤ Safety of power devices. Therefore, the power amplifier circuit generally contains special problems that are not found in the voltage amplification or current amplification circuit. As for voltage or current amplification, the power amplifier requires certain undistorted power, which generally works under the condition of large signal. When driven individually, they work fine, its only when in a parallel setup I am seeing the problems.Power amplifier, as the name suggests, is the abbreviation of power amplification. The IC's are heatsinked and have a fan on them - so this shouldnt be the case? Maybe this is due to some sort of inbalance between the 2 IC's? They are both set with a gain of 2 - 0.1% resistors, and have an output series resistor with a value of 0.1Ohms. I think this is due to the IC's getting too hot? As soon as I dropped the resistance to 12Ohms, the output of the amplifier became unstable. When testing on a test load, set at 100 ohms, the parallel setup worked fine. I was previously using the LM4766 in a bridged setup, but this was for a radio drawing 1A at 12V - which worked perfectly.ĭue to the increased power I looked at using the LM3886 in parallel as this looked like it could provide enough power easily. I am using it to drive the DC supply of a Radio - which draws approx 6A at 12V, so essentially a 2ohm load.
I am currently using the LM3886 in a parallel setup as explained in app note.
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