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TPA3118D2: What factor will effect the phase difference between SW+ and SW- signal ?

Went Cao
Genius 5550 points
Part Number: TPA3118D2

Dear all

     Below is TPA3118D2 circuit diagram, but there is a phase problem, the phase of SW+ and SW- are not synchronize, the SW+ would be del ay for the SW- in 760ns time.

     I want to know,what factor will effect the phase difference between SW+ and SW- signal ?

  • 0
    TI__Mastermind 24835 points
    Hi Went,
    Do you think the phase offset is an issue please? The phase offset actually helps to pass EMI test, but doesn't cause any performance loss.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Genius 5550 points

    Dear Shawn

           In your opinion, the phase offset is normal ? But what conditions will be phase offset ?

  • 0 in reply to Went Cao
    TI__Mastermind 24835 points
    Hi Went,
    I just notice that you are using TPA3118D2. The phase offset is not expected on this device. The scope capture you shown above is for the differential output OUTP and OUTN? They should be alligned.
    From your SCH, slave mode is used. Where is the Sync clock from? Make sure it's from another master AMP device. And from the scope screen capture, the PWM frequency is only 131kHz, which is quite low. The OSC is not working within the recommended range.
    Best regards,
    Shawn Zheng