Hello
My client intends to use TAS5711 as single filter PBTL like attached schematic..
However, there are big POP when PWM had ON ( 0x05= 00) ( wave form attached.
blue and light-blue is each ouput) ,
Following is the register-setting. It seems no problem..
~~~~~~~~~~~~~~~~~client's setting from~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
! Factory Trim
X1b 00
! wait 25ms
! PBTL setting
X20 00 01 77 72
X25 01 00 22 45
X19 3A
! PWM On
X05 00
~~~~~~~~~~~~~~~~~~~~~~to here~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Question 1
The BST cap in EVM ( C16,C22, C45, C9) are 33nF in EVM, but client use 3.3nF.
What range of should be used for BST cap's value. ( ex at least 10nF...)
Question2
If PBTL pin were High,TAS5711 automatically set PWM_A = PWM_B, PWM_C=PWM_D ?
If so, I think 0x25=01 00 22 45 (client's setting: PWM1=A=B,PWM3=C=D ) and
also 01 10 32 45 ( data sheet p34 PWM1=B,PWM2=A, PWM4=C,PWM3=D) is both OK in case
0x19=3A (PWM2 and PWM4= shutdown).
Is it correct?
Question 3
I think TAS5711 work under single filter PBTL, but you mentioned TAS5727 is fine in
another post. (*) Would you please let me know the reason?
(*)
http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/t/97585.aspx
I hope your answer wtihin2 days
Thank you nad with my best regards