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TAS5782MEVM: Overtemperature Error Detection for Peak Output Power

Sadanori Kato
Guru 36490 points
Part Number: TAS5782MEVM
Other Parts Discussed in Thread: TAS5782M,

Hi,

How many seconds later will TAS5782M detect the overtemperature error(OTE) on the TAS5782MEVM if outputting 30W/ch with 4Ω load impedance and 22V power supply voltage in BTL configuration continuously ?

Best regards,
Kato

  • 0
    TI__Expert 6985 points
    Hello Kato-san! This is not specific data that we characterize, as there are too many variables here that don't allow us to quote a specific spec. What we do note is the Page 12 Thresholds and recovery times. Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    Guru 36490 points

    Hi Jeff-san,

    Thank you for your prompt reply.

    Unfortunately, I don't have TAS5782MEVM that works normally in BTL configuration as the following post, so I cannot grasp the actual value of the thermal characteristics using TAS5782MEVM.
    I understand that it isn't mentioned in the specification, however it will be very helpful for our customer if you will be able to provide the thermal characteristics to me for reference.
    Could you please look into this and get back to me ?

    https://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/t/600444

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Guru 52115 points

    Hi Kato,

    Let me see if I can offer you a rough data based on TAS5782MEVM.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Guru 36490 points

    Hi Andy-san,

    Thank you for your response.

    As mentioned above, the device A on the TAS5782MEVM was dameged, so I got your local FAE's cooperation and confirmed whether being able to output 30W/ch using the device B in BTL configuration continuously.
    As a result, TAS5782M didn't detect the overtemperature error for thirty minutes at the room temperature, however the THD+N performance is degraded a little.
    Furthermore, I evaluated TAS5782M increasing the output power, then the common-mode output voltage was increased and the output waveform clipped only on the power supply rail side when outputting 40W/ch continuously.
    Could you please double-check whether this symptom can be replicated and tell me why this symptom occurs ?
    Moreover, do TPAxxxx family devices also cause this symptom ?
    Unfortunately, I didn't capture that waveforms.

    Best regards,
    Kato