Re: Sound!
Posted: Thu Jul 06, 2017 2:12 pm
Ah! Now I'm assuming this amplifier is a standard analogue device, either Class B or BTL (Bridged TansformerLess). You're correct, 1.5W at 5V is 300mA, but that's a constant (resistive) load. An audio amplifier is nothing like a constant load. In addition you have to allow a factor for the heat generated in the output transistors (Inefficiency).
I' can't recall the formula for calculating peak supply current in this form of amp, but here I would guess somewhere in the region of over an amp. So the regulator is shutting down on audio peaks thereby resetting the Micro. Use a separate regulator for the audio amp fed direct from the 'power brick'. Is it only a 5V supply amp or has it a range of supply voltages?
Even if it were a Class D amp the above still applies (to an extent).
Steve A.
I' can't recall the formula for calculating peak supply current in this form of amp, but here I would guess somewhere in the region of over an amp. So the regulator is shutting down on audio peaks thereby resetting the Micro. Use a separate regulator for the audio amp fed direct from the 'power brick'. Is it only a 5V supply amp or has it a range of supply voltages?
Even if it were a Class D amp the above still applies (to an extent).
Steve A.