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TPA2011D1: Request for Technical Support – TPA2011D1YFFR-Based Audio System Design

Abdulmohaimen Algamoudi
Prodigy 10 points
Part Number: TPA2011D1


Tool/software:

Dear TI Team,

I am currently designing a sound system that incorporates five Class-D amplifiers based on the TPA2011D1YFFR. The intended system gain is in the range of 8 to 13.5 dB (still to be finalized). I have already ordered the evaluation board for this IC and conducted preliminary testing. I would greatly appreciate your support on the following aspects of the design:

1. Simulation Setup

For simulation purposes, I used the same component values found in your reference simulation files, changing only the input resistor (Ri) to explore different gain configurations.

  • Could you please verify if my simulation setup is valid and aligned with recommended practices?

2. Circuit Design and Power Supply

My amplifier circuit replicates the design of the official evaluation board. Each IC will drive an 8-ohm speaker load, and all five amplifiers will be powered by a shared 5V battery supply.

  • Is this a viable approach without causing interference between the channels?

  • What is the maximum expected current draw per amplifier under full-load conditions with an 8-ohm speaker?

  • Would you recommend incorporating any buffering or decoupling mechanisms on the shared supply rail to avoid noise or power integrity issues?

3. Output Filtering and Speaker Wiring

For the output filter components, I am using the same values as those found on the evaluation board. However, the connection from the PCB to the speaker will be made using a 20–30 cm cable.

  • In this case, should I consider adjusting the output filter component values due to the cable length, or are the default values still suitable?

I will share the simulation files, schematics, and PCB layout. Any insights or feedback you can provide would be highly appreciated.

Thank you in advance for your support.

Best regards,
Abdulmohaimen Algamouditi support.zip

  • 0
    TI__Guru** 110725 points

    Hi Abdulmohaimen,

    Thanks for sharing your design for review. I'll add some comments below:

    • You can estimate the input current draw based on the provided efficiency numbers. eg, Figure 1 shows efficiency of ~94% at 1.8W, meaning Pin = 1.8 / 0.94 = ~1.92W, then considering VDD = 5V the Iin = 1.92W / 5V = ~383mA. Note that this is RMS value so for peaks you may consider about twice as much, and this is for a single amplifier.
    • It is best to connect each amplifier directly to the voltage source, using a star connection. The common inductance to the source between amplifiers and other sensitive circuits should be as low as possible.
    • Depending on the EMI constraints of your system, you may consider replacing ferrite beads with actual inductors so that filter cutoff frequency is reduced and the Class-D switching itself is filtered out. You must consider that any un-filtered content will travel through the cable length.
    • It is recommended to route the unused input along with the used input trace closer to the audio source, this helps with impedance matching across inverting and non-inverting inputs

    Best regards,
    -Ivan Salazar
    Applications Engineer