How to Use TPA3116D MONO: Examples, Pinouts, and Specs

The TPA3116D MONO is a high-efficiency Class D audio amplifier designed for driving speakers in a wide range of audio applications. It delivers high output power with low distortion, making it ideal for both portable and home audio systems. This amplifier is known for its excellent thermal performance, integrated protection features, and compact design, which simplifies its integration into various projects.

• Portable Bluetooth speakers
• Home audio systems
• Soundbars and subwoofers
• DIY audio amplifier projects
• Public address (PA) systems

• Amplifier Type: Class D
• Output Power: Up to 100W (mono mode, 2Ω load, 24V supply)
• Supply Voltage Range: 4.5V to 26V
• Efficiency: Up to 90%
• Total Harmonic Distortion + Noise (THD+N): < 0.1% at 1W
• Signal-to-Noise Ratio (SNR): > 100 dB
• Input Impedance: 30 kΩ
• Output Load Impedance: 2Ω to 8Ω
• Thermal Shutdown Protection: Yes
• Short-Circuit Protection: Yes
• Operating Temperature Range: -40°C to 85°C

The TPA3116D MONO is typically available in a 32-pin HTSSOP package. Below is the pin configuration and description:

Note: The remaining pins are typically used for additional power, ground, or configuration purposes. Refer to the datasheet for a complete pinout.

1. Power Supply: Connect a DC power supply within the range of 4.5V to 26V to the PVCC and AVCC pins. Ensure the power supply can provide sufficient current for the desired output power.
2. Speaker Connection: Connect the speaker terminals to the OUT+ and OUT- pins. Use a speaker with an impedance between 2Ω and 8Ω.
3. Audio Input: Provide an audio signal to the IN+ and IN- pins. Use a preamplifier or audio source with an appropriate signal level.
4. Gain Configuration: Set the gain using the GAIN0 and GAIN1 pins. The gain settings are as follows:
   • GAIN0 = 0, GAIN1 = 0: 20 dB
   • GAIN0 = 0, GAIN1 = 1: 26 dB
   • GAIN0 = 1, GAIN1 = 0: 32 dB
   • GAIN0 = 1, GAIN1 = 1: 36 dB
5. Shutdown and Mute: Use the SDZ pin to enable or disable the amplifier. Use the MUTE pin to mute the output without shutting down the amplifier.
6. Protection Features: The TPA3116D MONO includes built-in protection mechanisms such as thermal shutdown and short-circuit protection. Ensure proper heat dissipation by using a heatsink if necessary.

The TPA3116D MONO can be used with an Arduino UNO to control audio playback. Below is an example of how to use the Arduino to toggle the amplifier's mute function.

// Define the pin connected to the MUTE pin of the TPA3116D MONO
const int mutePin = 7;

void setup() {
  // Set the mutePin as an output
  pinMode(mutePin, OUTPUT);

  // Start with the amplifier unmuted
  digitalWrite(mutePin, LOW); // LOW = Unmute
}

void loop() {
  // Mute the amplifier for 5 seconds
  digitalWrite(mutePin, HIGH); // HIGH = Mute
  delay(5000);

  // Unmute the amplifier for 5 seconds
  digitalWrite(mutePin, LOW); // LOW = Unmute
  delay(5000);
}

Note: Ensure the Arduino's ground is connected to the amplifier's ground (GND) for proper operation.

• Use decoupling capacitors close to the power supply pins to reduce noise and improve stability.
• Avoid exceeding the maximum supply voltage (26V) to prevent damage to the amplifier.
• Ensure proper heat dissipation, especially at high output power levels.
• Use shielded cables for audio input to minimize noise and interference.

1. Can I use the TPA3116D MONO with a 12V power supply?

   • Yes, the amplifier works with a supply voltage as low as 4.5V. However, the output power will be limited by the supply voltage.

2. What is the maximum speaker impedance supported?

   • The TPA3116D MONO supports speaker impedances between 2Ω and 8Ω.

3. Do I need a heatsink for this amplifier?

   • A heatsink is recommended for high-power applications to prevent thermal shutdown.

4. Can I use this amplifier in stereo mode?

   • No, the TPA3116D MONO is designed for mono operation. For stereo applications, consider using the TPA3116D2.

By following this documentation, you can effectively integrate the TPA3116D MONO into your audio projects.