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Hi Xiaolin,
Thanks for your response.
Do your mean the L5/L6 inductor value in the schematic?
According to the document slou440, the L5/L6 is 15uH, and the C49/C50 is 0.68uF, so the fc of this LC filter is 49.8KHz.
We use the TAS5751M Evaluation Module. We just connect one 4ohm resistor to J3, and test the power on the 4ohm resistor.
And we find the power has a attenuation when the signal is high than 10KHz.
Do you think the attenuation is expected?
Thanks,
Zhongbo Han
Hi Zhongbo,
I think it is caused by the frequency response of the LC filter. You can see details by using tools attached:
Class-D LC Filter Designer.xlsx
Regards,
Alix Wan.
Hi Alix,
Thanks for your reply.
We use the Class-D LC Filter Designer to simulate it. There is about -2dB attenuation at 20KHz for 4ohm load.
So the attenuation is caused by LC filter.
Thanks,
Zhongbo.Han