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2.1 Channel 5W, 5W, 10W Output (4ohm)

David Eddy
Prodigy 20 points
Other Parts Discussed in Thread: TAS5711, TAS5731

Hello,

I am new to the forums and was directed here by the TI Chat help. I'm designing a bluetooth speaker and need some help with amplifier board selection.

Here are my hard specifications:
1. 2.1 channel output with 5W left, 5W right, and 10W sub (all 4 ohms, although the 10W could be 8 ohm if necessary) (5W 4ohm speakers have already been sourced)
2. Can connect to Bluetooth (v4.0 or v4.1) chip (or preferably already had a Bluetooth chip integrated into it)
3. Accepts DC input, preferably 5.4V - 8.4V (I have already sourced a battery like this, but I source another if need be)

I am a biomedical engineer, but my background is in mechanics. I am just becoming familiar with electrical engineering through this project. I may need further clarification on technical details.

Sincerely,
David Eddy



  • 0
    TI__Guru** 108895 points
    Hi David,

    Welcome to e2e.
    Let me try to help you with your device selection. Is it fine for you to look into Class-D amplifiers? Perhaps some amplifiers from the TAS57xx family could help. Our amplifiers do not have bluetooth interface integrated, you would need to connect your bluetooth interfacing device to the amplifier by using analog signal or digital signal, digital signal usually is I2S.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 20 points

    Ivan,

    Class D Amplifiers are preferred for their energy efficiency. This is for a portable Bluetooth speaker system, so Class D Amplifiers will work well. 

    I will look at the TAS5711 and TAS5731. To confirm, it looks like this audio amplifier can handle either:
    1. 2x 20W 8ohm speakers
    2. 2x 8W 2ohm speakers
    3. 2x 15W 4ohm speakers + 1x 30W 4ohm speaker

    Vin = 8V to 12V

    If I wanted to decrease the output power going to the speakers, would I be able to apply a voltage divider at the output to have the correct power? If not, how would I alter the output power to not send too much through a 5W speaker?

    Sincerely,
    David Eddy

  • 0 in reply to David Eddy
    TI__Expert 6985 points
    Please look at page 10 of the DS: www.ti.com/.../tas5711.pdf You can vary your load and PVDD to stay below 5W as needed. Or use a low power amp rated lower: www.ti.com/.../low-power-audio-amplifiers-less-than-5W-overview.page . Thanks, Jeff