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Power problems - TPA3116D

Fernando Cuzziol46
Prodigy 40 points

Colleagues,
I'm having problems with the power project using TPA3116 in PBTL mode.
In the input circuit, there is difference in output power, use differential input or single input ??
In the output filter using ferrite 10uH and capacitor 1nF.
Is there a difference using bead chip ??

  • 0
    TI__Guru* 95085 points
    Hi Fernando,

    There should be no difference in the output power for differential input or single-ended input. Do you have captures of the output power? Also do you have schematics you can share?
    Regarding the output filter, I suggest you to follow the recommendations in the data sheet and user guide.
    It is recommended to use an LC filter when there are low frequency (<1MHz) EMI sensitive circuits. The ferrite bead filter is good enough when it is needed to eliminate EMI radiated emissions greater than 30MHz.

    Best regards,
    Iván Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Prodigy 40 points
    Hi, Iván,

    I'm finding instability in my circuit. By increasing the supply voltage above 17V enters saturation and cuts and back for a second.
    Researching data sheet realize that the problem is in Plimit pin because in my circuit is unstable because the EVM board from Texas is stable at 7 VDC for any variation in tension.
    My circuit is equal to the EVM.
    Where can I have a problem ??