Choosing the size of the capacitance of the 5V digital power amplifier needs to consider many factors, such as load current, ripple voltage, efficiency and so on. In general, a capacitor large enough to ensure stability and low ripple voltage needs to be selected.
A common practice is to choose a capacitance size of 10 times the output current, for example, if the output current is 500mA, the capacitance size should be 5000μF. However, the specific capacitance size also needs to be comprehensively considered according to the specific design requirements and circuit parameters to achieve the optimal performance.