I received a TPA2013D1EVM today (my 2nd one in a month). The first one worked well for awhile, but then suddenly the 8-ohm speaker I had connected to it melted. I tried another speaker ... same thing. Since I had used these speakers before, I assumed something was wrong with the EVM.
With the replacement EVM today, I connected it to a known good 8-ohm speaker. Powered the EVM with a 3.8V supply. And connected it to a 1kHz sine wave (measured the sine-wave to be 400mVp-p into a high impedance load). Gain is set to 6V/V, which is the default.
Turned on the power, and measured 0.7A average current. That's WAY too much current. Turned it off quickly, don't want to destroy any more speakers because I know what will be coming if I continue to test.
Given that this is the 2nd EVM that has failed (and although on the first one I didn't at the time that it failed measure current, the symptoms of melting speakers would be consistent with too much current going into the speaker), I'm trying to figure out what the issue could be.
This EVM was right out of the box and into the lab, and behaved this way from the moment that it was first powered.
Without a speaker connected, I've measured again the voltages and everything looks fine.
Has anyone else seen TPA2013D1 fail in a way that causes them to draw excessive current?
Any ideas what the problem could be and why I seem to be so unlucky as to have had a poor evaluation experience with both amplifiers that I tried.