TAS5830EVM: TAS5830 100W PBTL 2ohm THD+N Issue

Part Number: TAS5830EVM
Other Parts Discussed in Thread: TAS5830

Hi AE engineers,

We are testing TAS5830 EVM for PBTL 100W 2ohm speaker. THD+N ratio is higher than 2% when F=7-8K as shown figure1. The customers use 2 TAS5830 to provide 2x100W . It’s OK for low F, but we need THD+N less than 1% for whole frequency band from 20Hz to 20kHz. I have tried changed Lout from 10uH to 15uH, but it didn’t seem work well as shown in figure 2(Please let me know if you can’t see clearly). The sampling frequency are 48K. We have tried BD mode 1SPW mode, and all selections of the PWM switching frequencies and class D loop bandwidth, but it didn't seem to work well. I wonder if you could provide some advice. 

Thanks a lot for your support.

Figure1

figure2