Texas Instruments provides a recommended PCB layout in the datasheet, which includes guidelines for component placement, trace routing, and thermal management. It's essential to follow these guidelines to ensure optimal performance and minimize electromagnetic interference (EMI).
The gain setting of the TPA122DR depends on the input signal level and the desired output power. The datasheet provides a gain setting table, and you can use the formula: Gain (dB) = 20 * log10 (Vout / Vin) to calculate the required gain. You can also use the TI Audio Amplifier Gain Calculator tool to simplify the process.
The maximum power dissipation of the TPA122DR is dependent on the ambient temperature and the thermal resistance of the PCB. The datasheet provides a power dissipation curve, and you can use the formula: Pd (max) = (Tj (max) - Ta) / RθJA to calculate the maximum power dissipation. Typically, the maximum power dissipation is around 2.5W.
The TPA122DR has built-in overvoltage protection (OVP) and undervoltage protection (UVP) circuits. However, it's still recommended to add external protection components, such as a voltage regulator and a voltage supervisor, to ensure the device operates within the recommended voltage range.
The recommended input capacitor value is typically between 1uF to 10uF, and the type should be a high-quality, low-ESR ceramic capacitor. The input capacitor helps to filter out noise and ripple from the input signal, and it's essential to choose a capacitor with a suitable voltage rating and temperature coefficient.
TPA122DR datasheet
by Texas Instruments
