A good PCB layout for the TDA7381 involves keeping the power supply lines as short as possible, using a solid ground plane, and placing the input and output capacitors close to the IC. Additionally, it's recommended to use a shielded enclosure and to keep the audio signals away from the power supply lines.
The input and output capacitors should be chosen based on the frequency response and impedance of the circuit. A good starting point is to use capacitors with a value of 2.2uF to 4.7uF for the input and output stages. The capacitor type should be a low-ESR ceramic or film capacitor.
The maximum power dissipation of the TDA7381 is dependent on the ambient temperature and the thermal resistance of the package. The maximum power dissipation can be calculated using the formula: Pd = (TJ - TA) / θJA, where Pd is the power dissipation, TJ is the junction temperature, TA is the ambient temperature, and θJA is the thermal resistance.
The TDA7381 has a built-in overvoltage protection circuit, but it's still recommended to add external protection circuitry to protect the device from overvoltage and undervoltage conditions. A voltage regulator or a voltage supervisor can be used to regulate the input voltage and prevent damage to the device.
The recommended operating voltage range for the TDA7381 is 9V to 18V, with a typical voltage of 12V. Operating the device outside of this range may affect its performance and reliability.
TDA7381 datasheet
by STMicroelectronics
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