TPA2026D2: shut down sequence -2

K.Yaita

Part Number: TPA2026D2

Hi Team,

My customer considers shut down sequence as the following for TPA2026D2.
----------------------------------------
write 0x03 (01H register) : disabling right and left amplifiers
write 0x23 (01H register) : SWS=1
wait 80us
apply SDZ high to Low
----------------------------------------

Is wait time 80us above sufficient?
The background of the question is datasheet shows "Do not interrupt the shutdown sequence after changing SWS from 0 to 1." so would like to confirm it.
Does figure 29 shows wait time more than 1.6ms is required?

Best Regards,
Yaita

over 5 years ago

0 Luis Fernando Rodriguez S. over 5 years ago

TI__Guru* 84915 points

Hi, Yaita-san,

Figure 29 shows how the SWS bit affects the output once it is changed from 0 to 1. As you may see in the Figure 29, the output is immediately shutdown after applying the software shutdown. So, 80us would be sufficient in customer's shutdown sequence.

Best regards,
Luis Fernando Rodríguez S.

0 K.Yaita over 5 years ago in reply to Luis Fernando Rodriguez S.

Guru 29690 points

Hi Luis-san,

Thank you for your kind support.
I understand 80us is sufficient.

Which means the following shutdown sequence is no ploblem?
I would like to confirm just in case.
----------------------------------------
write 0x03 (01H register) : disabling right and left amplifiers
write 0x23 (01H register) : SWS=1
wait 80us
apply SDZ high to Low
----------------------------------------

Best Regards,
Yaita

0 Luis Fernando Rodriguez S. over 5 years ago in reply to K.Yaita

TI__Guru* 84915 points

Hi, Yaita-san,

The shutdown sequence is correct. There shouldn't be any problem if this sequence is applied.

Best regards,
Luis Fernando Rodríguez S.

Audio

Audio forum

TPA2026D2: shut down sequence -2