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TAS5782M: TAS5782 thermal operating conditions

PYTsai
Genius 12330 points

Part Number: TAS5782M

Hi

We are currently testing thermal performance of the product, and want to be sure we are operating the TAS5782 in optimal modes for minimum temperature and best performance.

 

I am looking specifically for information on FW control modes, and to confirm my understanding.

 

Question 1:

 

In the "Power dissipation characteristics" section of TAS5782 datasheet page 20, we can see that we do not expect `mute` mode to reduce power dissipation or temperature a lot. We can confirm using i2c commands to enable mute (P0-R03-D[0,4]) and automute (P0-R65-D[2:1]) that thermal performance is roughly the same. However if we use the *external* `SPK_MUTE` pin to do a 'soft mute', we notice a 10 degree drop in the TI amp temperature.

 

Is this expected behaviour? How is the external `SPK_MUTE` soft mute different from internal i2c soft mute?

 

Is it possible to get the same thermal performance improvement using internal 'auto-mute' function?

 

Question 2:

 

What are the recommended optimal modes to run the system for lowest

temperature:

 

a. While playing audio

b. While not playing audio

 

Is it common to use 'standby' or 'powerdown' modes (P0-R02-D[0,4]) while idle?

How quickly does the system recover from standby or powerdown (is it milliseconds, or microseconds?).

 

Do you have any other advice for FW configuration of the TI amp for minimal temperature?

 

  • 0
    TI__Expert 6720 points

    Hi PYTsai,

    Question1:

    As datasheet Page15 Notes mentioned, I2C register setting to 'Mute' or 'Auto-Mute' refer the same Mute status, PWM is still switching but only digital volume ramps down to mute. So the power dissipation is similar to normal idle status.

    Regarding hardware 'SPK_MUTE', it will configure TAS5782M into 'standby' mode, which stops PWM switching. It will significantly reduce idle power dissipation and improve thermal performance. It could be also implemented by using below Standby register configuration.

    Question2

    In order to improve thermal performance. below are suggested:

    1. Idle status

    It's suggested to set into 'Standby' mode to stop PWM switching for better thermal performance. It needs ~5ms for fully back to normal volume playing from Standby mode. 

    2. Audio playing

    Lower PWM switching frequency, Larger inductor. Smaller PVDD voltage, better PCB (higher layers & larger Cu thickness) would help to improve thermal performance.

    Regards,

    Matthew