I want to use the TPA3116D2 amplifier to output a minimum of 50W at frequencies in the 20-30kHz band with a 1Vrms input signal, 4 Ohms load.
After various tests in PBTL mode, my output signal saturates as soon as 0.7Vrms, and a power much lower than 50W (20-30W).
Here are my questions:
- In PBTL mode, should I use one LC filter per channel (so 4 LC) or use 2 LC (one for the right output, one for the left output) and then connect them all to the load?
- Does the LC filter have an impact on output power?
My PBTL circuit uses 2 inductors (6.8uH) and 2 capacitors (1uF).
I also tested my assembly (2 LC) with the evaluation board (4LC) in PBTL mode, using the same component values = 10uH and 680nF. It seems that the PBTL mode of the evaluation board, with 4 LCs, allows much more power to be output.
Do you have any suggestions or answers to these questions?