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TPA3122d2 in BTL mode

Yousri Slama
Prodigy 20 points
Other Parts Discussed in Thread: TPA3122D2

Hi

I tried to build the circuit in Fig. 29 of the datasheet in a breadboard, but I only hear a sound every second. I put a sine signal of 1 KHz as input but I don't know if I have to invert the phase signal in one of the input channel? If I don't put an output filter, can I even so hear something ?

  • 0
    TI__Mastermind 37045 points

    Hello Yousri,

    TI offers an excellent EVM for TPA3122D2 for customer evaluation. They can be ordered online via TI website in most countries.

    Using breadboard for class D amps is probably not the best way to go since it is difficult to have a good ground and close PVDD high frequency decoupling for the amp. Please refer to the layout guidelines on datasheet pg 14. It is important to follow these guidelines to ensure success. If your amp is configured as differential input BTL output, then one of the input needs to be inverted.

    I would suggest looking at the VCC, inputs, PWM outputs, MUTE, SD and post LC filter outputs voltage waveforms during operation to see if there is anything out of ordinary.

    Do you mind describe a little bit about your project?

    Thanks,

    reg,

    Paul Chen

    Audio Applications Engineer

    Dallas TX USA 

  • 0 in reply to user5276421
    Prodigy 20 points

    Thank you for your helpful answer. My project is to make a wall of 48 speakers. Each one must have an individual amplifier of 24W  and its own audio track. I also have to make a PCB  with the technology THT. I choose a class D amplifier to have a better efficiency and without the need to add an external heat sink. I didn't find a mono class D amplifier of 25W like it.

  • 0 in reply to Yousri Slama
    Prodigy 190 points

    I have this same exact problem. Please see my post: http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/p/366171/1286765.aspx#1286765