TAS2572: Relationship of AMP_LVL register setting(Amplifier Output Level Settings) and Speaker module rating power

Hi Kuofeng,

TAS2572 is a smart AMP which usually will use protection algorithm. the protection algorithm will protect the speaker through the real-time monitor of the temperature and excursion of the speaker. usually it will exceed the rated power of the speaker but can avoid the speaker's broken.

after integrate the algo into your system, the algo can work under 18dBv gain.

you can get some useful information from the below document.

https://www.ti.com/lit/pdf/slaa757

Br,

Wenbin

Hi Wenbin

   we suspect noise at input of TAS2572 and has risk to damage output speaker. 

Aside from AMP_LVL register setting, we’re discussing other ways to prevent possible input noise effect of TAS2572.

1. Can I use pin SDZ# to pull low and shut down the amplifier for protection when no normal input from system ? Need to initialize the sequence again and has side effect?
2. Can I lower the setting value of AMP_LVL when no normal input from system, and change AMP_LVL back to the original high AMP_LVL setting value when normal operation? Does this mean that I don't need to initialize the sequence again?

Thanks.

Hi Kuofeng,

1 pull low SDZ will shutdown and reset the chip, when you want to active the device again, you have to initialize it again.

2 it's ok to lower the AMP_LVL, but usually this level should be changed when the device is software shutdown. otherwise, there is risk of POP noise.  so in fact, you can just set the book0page0register0x02=0x02 to set the chip to software shutdown, next time when you need to playback, just set this bit to 0 to enable the device, no initialize is required.

Br,

Wenbin

Hi Wenbin

Make more clearly about HW or SW shutdown when no-control but initialize& playback when controlling and their side effect.

1. Could we do  SDZ"L" >> initialize it& playback>> SDZ"L" >>  initialize it& playback>> SDZ"L">>...? Side effect?

2.Could we do software shutdown>> initialize it& playback>>software shutdown>> initialize it& playback>>...?  Side effect?

Thanks, KF

Hi KuoFeng,

the option1 you mentioned is ok, the side effect is it may spend some time to initialize. 

the option2 is similar. in fact, you can ignore initialize process if all the power supply is always there. no side effect I think. as most mobile phone is using similar solution.  initialize->chip active -> play->software shut down->chip active -> play -> software shutdown... but please keep all the power supply is always active, otherwise it need to initialize the chip.

Br,

Wenbin

Hi Wenbin

 if we were using the Class H boost converter within the TI amplifier, in addition to the Class D. It doesn't sound like we are. Please help confirm.