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TAS5815: What to bias PVDD to as default voltage setpoint?

Cameron Wutzke
Expert 4227 points

Part Number: TAS5815

Hey Sydney,

 

What do you recommend for the default voltage output setpoint? I understand the rail will move up and down based on feedback from the TAS5815, but I'm not quite sure where to set the default point.

 

Here's my understanding after chatting with an LLM:

When Class-H is OFF (disabled):

  • PWM signal = LOW (ground)
  • Buck-boost operates at maximum boost output
  • Provides full voltage headroom you designed for
  • This is the "safe" default state with maximum available power
 

When Class-H is ON (enabled):

No audio signal:

  • PWM signal = HIGH
  • Buck-boost operates at minimum boost output
  • Conserves power when no signal present
 

With audio signal:

  • PWM modulates between HIGH and LOW
  • Buck-boost tracks the signal envelope
  • Voltage adjusts dynamically based on instantaneous needs

 

I get confused (we are not using PPC3) , and do not understand the actionable next step. In my mind there would be a register in TAS5815 to define the output voltage level controlling the buck-boost. I get confused where to go from here

  • 0
    TI__Mastermind 23150 points

    Hello,

    I highly recommend using PPC3 here. There are quite a few back end calculations that are done and set the device registers accordingly. This feature was not designed to be configured by hand by customers as it would be very time consuming which is why we have PPC3. If you have questions on what PPC3 is doing feel free to reach out. For your question though you enter you max and min PVDD voltages required in PPC3 and it will calculate the external components required. I would add a picture of PPC3 here, but seems E2E is not allowing me at the moment.

    Regards,
    Sydney Northcutt