TI recommends using a 10uF ceramic capacitor in parallel with a 100nF ceramic capacitor, placed as close as possible to the power pins (VIN and GND) to ensure stable operation.
The gain setting depends on the input signal level and the desired output power. TI provides a gain calculation formula in the datasheet. For a typical application, a gain of 20-30 dB is recommended. However, it's essential to experiment with different gain settings to find the optimal value for your specific use case.
The TPA3118D2DAP can handle up to 20W of continuous power per channel into a 4Ω load. However, this value can vary depending on the ambient temperature, supply voltage, and other factors. Always check the thermal and power dissipation calculations to ensure safe operation.
Implement thermal protection by monitoring the device temperature (TJ) and shutting down the amplifier if it exceeds 150°C. You can also use thermal pads or heat sinks to improve heat dissipation. Ensure good airflow and avoid blocking the airflow around the device.
Follow the recommended PCB layout guidelines in the datasheet, which include keeping the power traces short and wide, using a solid ground plane, and placing the input and output capacitors close to the device. Avoid routing sensitive analog signals near the power traces.
TPA3118D2DAP datasheet
by Texas Instruments
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