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TAS5733L: Output Power Specification for 4 Ohms

Chuchen Wang
Expert 3470 points
Part Number: TAS5733L


Hi,

My customer would like to drive 4ohm speakers at 2x15W with a PVDD=16.5V continuous operation.  The Output Power vs. PVDD graph does not specify data past 15V.  Can you confirm this is ok across 4ohms?

Also, regarding heat management, the PowerPAD is there- is any additional heatsinking recommended or required when running the amp at maximum continuous PVDD?

Thanks,

Chuchen

  • 0
    TI__Mastermind 24835 points
    Hi Chuchen,
    There is no poblem in outputting 2*15W on 4Ohm load with 16.5V PVDD. Make sure the modulation limit must be set to 96.1% or lower via the control port register 0x10. This is a thermal pad-down device, so heatsink is not supported and the PCB is actually used as the heatsink. To get a good thermal performance, please follow the EVM design as much as possible. www.ti.com/.../slou439.pdf
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    TI__Expert 3470 points
    Hi Shawn,
    Thanks for the quick response. What is the maximum output? Is 2x20W OK? 2x25W?
    -Chuchen
  • 0 in reply to Chuchen Wang
    TI__Mastermind 24835 points
    Hi Chuchen,
    Do you mean the transient output power or continuous output power? If the former, it should be OK because the transient output power depends on the OC THR(4A on TAS5733L). If you are talking about the continuous power, it mainly depends on the system level thermal design. And you need to know that the efficiency is lower with 4ohm load, comparing to 6ohm and 8ohm, which means the thermal issue is mroe challenging with 4ohm load with high output power.
    Best regards,
    Shawn Zheng