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TAS5508: the PVDD of TAS5508

Ray Hsu
Expert 1330 points
Part Number: TAS5508

Hi,

when i use ST DAP + ST516B, My PVDD is 51V,

but when i replacement ST DAP to TAS5508, my PVDD should be 53V to make same power output Watt,

Do you have any suggest? thanks!

  • 0
    TI__Guru 62390 points
    Ray,

    Have you compared the PWM waveforms of the ST DAP and the TAS5508? Are they using the same modulation index and duty cycle? Have you checked the phase of the channels to make sure they are correct?

    If possible please send an image of the ST DAP output and the TAS5508 output under the same conditions.

    Regards,

    -Adam
  • 0 in reply to Adam Sidelsky
    Expert 1330 points

    Please refer as below, the same condition with each solution, 

    Please help suggest which register i can try? thanks!

    STA516+TAS5508

    STA516+STA309

  • 0 in reply to Ray Hsu
    TI__Guru 62390 points

    Ray,

    I don't know the ST516 or ST309, I couldn't find much info on them.

    From your plot it looks like the ST309 is providing something that is NOT standard PWM output. The TAS5508 is providing 50% duty PWM that will have varying PWM duty cycle when audio is playing. You will need to figure out the input that the ST516 needs. The TAS5508 cannot output the same signal that the ST309 is currently providing. 

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Expert 1330 points

    So, TAS5508 need more high voltage than ST at the same power output,

    any config i can try set in TAS5508?

    thanks!

  • 0 in reply to Ray Hsu
    TI__Guru 62390 points

    Ray,

    You will need to look at the amplifier configuration as it will require a certain input type. Maybe there is a setting to change on the amp so that it will work with the standard PWM input that the TAS5508 is giving. 

    Please send me an email at adamsidelsky(at)ti(dot)com 

    Regards,

    -Adam