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TPA3110D2EVM: ok

6270692
Prodigy 10 points
Part Number: TPA3110D2EVM
Other Parts Discussed in Thread: TPA3110D2

Hello Team,

This is Swapnil S.

We got following THD data on TPA3110D2 EVM board.

LC filter value:- L:-22uH & C:- 0.68uF

Input  Waveform :-  1KHZ , Vrms :- 916 mVrms (near to 1Vrms )

Load :- Speaker 8ohm

Stereo Mode

Plimit setting :- 6.97V. Directly connect to GVDD.

Result:-

PVCC 10V DC , THD :- 11%

PVCC 12V DC, THD :- 5.6%

PVCC 13.5V DC, THD :- 3.8%

PVCC 16V DC, THD :- 1.8%

Observation:-

1. We are getting  glitchy  square wave before LC filter. As per below snap.

2. So, As per our study it happed due to "Dead time" concept of MOSFET which is used internally in IC.

3. Please share your valuable comments to reduce THD . 

Regards,

Swapnil

  • 0
    TI__Mastermind 19010 points

    Hi Swapnil,

    Dead time setting is fixed internal, so you can not adjust dead time.

    From your test result, the output must be clipping because of high power. So increasing PVCC can improve THD. 

    THD+N also related to inductor non-linearity of LC filter. ferrite core inductor will have good THD performance.

    Regards,

    Derek