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TPA3118D2/TPA3116D2 Maximum Output Power

Sadanori Kato
Guru 36540 points
Other Parts Discussed in Thread: TPA3116D2, TPA3118D2, TPA3002D2

Hi,

Our customers would like to know the maximum output power of the TPA3118D2 and TPA3116D2.
The conditions that they would like to know are as follows.

PVcc/AVcc : 24V
Load Impedance : 2ohm PBTL load
THD+N : both case of 1% and 10%
Ta : -40 to 85 degreeC
others : with heat sink

Moreover, there is described regarding "Maximum Output Power vs Supply Voltage" on page 12 figure 22 of data sheet.
Because there is described regarding "for drive speakers up to 100W/2ohm" on page 1 of data sheet, is it correct?
Does this mean that there is performance of the output power for these devices?

Could you please advise us about it?

Best Regards,
Kato

  • 0
    TI__Mastermind 37045 points
    Hi Kato-san, TPA3116D2 is spec'ed for continuous 2x50W/4R with heat sink (similar to the EVM) at supply=21V as shown in DS page 1. Figure 22 shows the max power with 2R load (THD) vs supply. However, it may require external cooling to sustain the power continuously and avoid triggering thermal protection. reg, Paul Chen Applications Engineer
  • 0 in reply to user5276421
    Guru 36540 points

    Hi Paul-san,

    Thank you for your cooperation.
    We referred to data sheet of TPA3002D2, calculated the maximum ambient temperature of TPA3118D2.
    The estimate conditions are as follows.

    TJmax  = 150 degreeC
    ΘJA   = 22 degreeC/W
    Po     = 2x30W
    η     = 92%@24V(on page 10 figure15 of Data Sheet)

    PDissipated = Po * (1/η-1)
                = 2x30W * (1/0.92-1)
                = 5.22W

    TAmax = TJmax - ΘJA * PDissipated
          = 150 degreeC - 22 degreeC/W * 5.22W
          = 35.22 degreeC

    Is it correct?

    Moreover, if TAmax is 85 degreeC, PDissipated become 2.95W and Po(average) become 33.98W.
    Is this proper as average power limit?

    Could you please advise us about it?

    Best Regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 37045 points
    Kato-san, Yes but the thermal performance depends heavily on the external factors such as PCB, inductors and PWM freq etc. I would suggest performing the experiment on the EVM to obtain accurate numbers based on the operating conditions. reg, Paul.
  • 0 in reply to user5276421
    Guru 36540 points

    Hi Paul-san,

    Thank you for your advice.
    We understood that my opinion is correct.
    We will suggest to our customers that they evaluate by using EVM regarding the thermal performance.
    If we obtain an additional question from our customers, could you please advise to us?
    Thank you so much.

    Best Regards,
    Kato