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Hi, I am making a (~300W) audio amplifier using three LM4780 chips from National.
I would like to know a few things. First, in the third attachment, "LM4780 Sch", what do you think of the schematic? I ordered these as PCBs, but are there any things that could be improved? Note that the inductor labeled 0.7MH is supposed to be 7uH.
Secondly, I am in the process of choosing transformers for the design. If you have a look at the "Copy of overture design guide" it is an excell design guide by national (but i had to print screen it as it wouldnt upload), and I have entered all the values I will be using. Where it says "Ipeak" it has about 5 amps. I assume this is maximum current into the spearkers, but how can I find out the total current draw for the amps (remembering I will be using three)?
I attached the datasheet as well if it helps, but I cant see any info like max current draw, why dont manufacturers sate this?
Best regards,
Michael
I would like to know a few things. First, in the third attachment, "LM4780 Sch", what do you think of the schematic? I ordered these as PCBs, but are there any things that could be improved? Note that the inductor labeled 0.7MH is supposed to be 7uH.
Secondly, I am in the process of choosing transformers for the design. If you have a look at the "Copy of overture design guide" it is an excell design guide by national (but i had to print screen it as it wouldnt upload), and I have entered all the values I will be using. Where it says "Ipeak" it has about 5 amps. I assume this is maximum current into the spearkers, but how can I find out the total current draw for the amps (remembering I will be using three)?
I attached the datasheet as well if it helps, but I cant see any info like max current draw, why dont manufacturers sate this?
Best regards,
Michael