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TAS5805M: The distortion of TAS5805M

wen gu
Prodigy 120 points
Part Number: TAS5805M
Other Parts Discussed in Thread: TAS5805

Hi Dear,

The distortion of THD+N (3rd and 4th harmonics) measured by power amplifier TAS5805 exceeds the standard (1%) on our device.

and the schematic design of TAS5805：

Could you help us to analyze what problems may cause this problem?

  • 0
    TI__Genius 14770 points

    Hi

    thank you for you question.

    can you tell me below information to help me analysis.

    1.output power, pvdd voltage.

    2. load resistance, using spk or resistance.

    3. switching frequency

    4. modulation mode, 1spw or other mode?

    usually, the thd is also high related to the inductor performance of LC filter, have you take a try other inductor?

    thanks.

    jesse

  • 0 in reply to Jesse Ji
    Prodigy 120 points

    Hi, Jesse

    Please refer to the following reply，thank you.

    1.output power, pvdd voltage.

    => 5W and 12V

    2. load resistance, using spk or resistance.

    =>  6Ω, using spk

    3. switching frequency

    => 768K

    4. modulation mode, 1spw or other mode?

    =>1spw

    Best regards,

    wen gu

  • 0 in reply to wen gu
    TI__Genius 14770 points

    Hi Gu

    resistance is used for testing in our datasheet.

    can you take a try with resistance to confirm whether can get close result.

    thanks.

    jesse