TPA2011D1 Output Oscillating Badly

Andig,

The part already has feedback, internally, before the filter.

What kind of oscillation are you seeing?

-d2

Don,

Does not matter whether there is input or not, the only output signal waveform displayed on the scope is the square waveform in about 333KHz.  And when the output signal reached to a certain level (about 1.7Vrms with a 4 ohms load), the output signal became unstable (or started oscillating).  

Thanks,

Thanks for the very useful video!  However, I made a low pass filter (cutoff frequency at 34KHz) and tried to measure the output, but the 250KHz square waveform still displayed fully.  Not sure why? 

Thanks,   

By the way, I used single-ended input configuration for this design.

Looking forward for some inputs from you!

Anadig

Hi, Andig,

It turns out we have a friend in common, Ryan!!!!

Anyway, take a look at figure 3 of the EVM users guide. We actually designed the EVM with an RC low-pass filter to make is easier to look at the outputs.

I think we have the LPF installed on the EVM if you have one of those.

SE input is no problem, just be careful to match the impedances seen by IN+ and IN-, otherwise you'll get pops.

-d2