• State Resolved
  • Replies 4 replies
  • Subscribers 47 subscribers
  • Views 92 views
  • Users 0 members are here
Support feedback
Options
Options
Related

TPA3255EVM: Output connection help

Jack Frederick
Prodigy 50 points
Part Number: TPA3255EVM
Other Parts Discussed in Thread: TPA3255

Tool/software:

In the TPA3255 users guide under section 3.3 (page 7), for the default setting of BTL 2.0, it mentions AP analog input under each line for speaker or resistive load. For example, 

  • "Connect left channel speaker/power resistor load (4–8 Ω) to TPA3255 EVM positive output terminal to

    OUTA (RED) and AP analog input channel A positive terminal."

    Is that a mistake?
  • For a standard stereo setup, the default 2.0 BTL, I should only need 2 speaker cables attached to Out A (left channel +), and Out B (left channel -), and 2 speaker cables attached to Out C (right channel +), and Out D (right channel-), right? Also, those ground terminals between A/B and C/D are used for a different setup?
  • Thanks
  • 0
    TI__Mastermind 18390 points

    Hi Jack,

    - What is the confusion here? OUTA(L+) from the TPA3255 would connect to a positive analog input terminal on the AP, such as channel A+. OUTB (L-) would connect to a negative analog input terminal on the AP such as channel A-. 

    - Your explanation of a standard stereo setup for BTL is correct. The extra GND terminals are on the EVM were likely implemented for easier measurements. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 50 points

    Hi Sebastian,

    So AP is just referring to the speaker itself, it sounds like. I was thrown off by the acronym "AP", thought maybe it was another set of terminals somewhere on the EVM that I missed. I'm a designer and not an engineer, what does AP stand for? I couldn't find an obvious reference to it online.

    Merci

    Jack

  • 0 in reply to Jack Frederick
    TI__Mastermind 18390 points

    Hi Jack,

    Apologies I think I understand the confusion now, the acronym AP stands for audio precision which is a company that makes instrumentation to measure the performance of amplifiers such as the APx555.

    In the end user scenario you would be plugging into a speaker but the reference to the AP is just for evaluation purposes on the EVM. You can always just plug into a speaker using the EVM as well. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 50 points

    Thanks Sebastian!