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TAS5631 in PBTL mode for 2Ohm output

Marcelo Williams
Intellectual 780 points
Other Parts Discussed in Thread: TAS5631, TAS5630

Hi Guys!

I have two questions related about output of TAS5631 or TAS5630 apply at a Automotive Class D Power Audio Amplifier:

 1)     Since the NXP part TDF8591 works with simetrical power supply they works with the wave from -12V to +12V excursion so it’s more resistant to automotive noise. In the case of our device how we can work on that??? Needs to be grounded??

 2)     The second question is a little bit related with the first one: here is common works in 2 Ohms Speakers (per output) in a 4 channel output module and the final customer used to do half bridge or full bridge (PBTL). A example, a amplifier with 4 channel 100W output the customer connect (short-circuit/PTBL) 2 channels in bridge to have 200W output. Can we do the same with our device?? 

If the both questions are yes? Did you have a schematic of that??

Thanks in advance!!

Marcelo

  • 0
    TI__Mastermind 18510 points

    Marcelo, TAS5630 and TAS5631 work from a single grounded supply  (please review pages 17-21 of data sheet SLES220B).  But I do not believe that the dual supply for TDF8591 (+/- 12 to 30 V) gives it high immunity to power supply noise.  S/E configurations inherently have lower supply immunity than differential configurations.  (See attached presentation "APA-ClassD-op-meast-100818.pdf").

    TDF8591 requires higher supply voltages than +/-12V to produce 100W, even S/E with 2ohm load.  (Page 13 of TDF8591 data sheet.)  TDF8591 requires both positive and negative switching supplies for reasonably high power.  In contrast, TAS5630 and TAS5631 work from a single grounded supply, so their power supply is simpler than TDF8591's.  The voltage still must be higher than 12V, but only one switching supply is required.

    I am not sure I understand your second question.  Please review pages 4, 9 and 10 of data sheet SLES220B regarding load impedances and output power in S/E, BTL and PBTL configurations.  I hope this will answer your question.

    Regards,

    Steve.

    APA-ClassD-op-meast-100818.pdf
  • 0 in reply to SteveCrump
    TI__Mastermind 18510 points

    Marcelo, I intended to attach a PDF above, and I have done this now.  If you downloaded it, please delete the PPT and do not distribute it to anyone.

    Best regards,

    Steve.