The maximum power dissipation of the TDA7561H is 2.5W, but it can be limited by the thermal resistance of the package and the PCB layout. It's recommended to keep the junction temperature below 150°C to ensure reliable operation.
The input capacitor should be chosen based on the input voltage ripple, output voltage, and output current requirements. A general rule of thumb is to use a capacitor with a value of at least 10uF and a voltage rating of at least 1.5 times the input voltage. Additionally, the capacitor's ESR (Equivalent Series Resistance) should be low enough to minimize voltage drops and ensure stability.
The bootstrap capacitor is used to generate the high-side gate drive voltage for the internal power MOSFET. It's connected between the bootstrap pin and the output voltage, and its value should be chosen based on the output voltage and the switching frequency. A typical value is around 100nF to 220nF.
To ensure stability, it's essential to follow the recommended PCB layout guidelines, use a suitable input capacitor, and add a compensation network (R-C network) between the output and the feedback pins. The compensation network helps to stabilize the loop and prevent oscillations. The values of the R-C network can be calculated using the datasheet's stability analysis guidelines.
The maximum output current of the TDA7561H is 1.5A, but it can be limited by the thermal resistance of the package and the PCB layout. It's recommended to keep the output current below 1.2A to ensure reliable operation and minimize thermal stress.
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