There are three kinds of DC-DC buck schemes: linear regulator, switching regulator and buck converter. Linear voltage regulator is simple to use, low cost, but low efficiency, output voltage stability is poor. Switching regulators are superior to linear regulators in terms of efficiency and stability, but it is difficult to design and debug, and the cost is high. The buck converter has complex structure, but high efficiency and good output voltage stability. Among them, switching regulators and buck converters are often used in efficient and high-performance buck power supply design, and linear regulators are suitable for some low-power applications with low efficiency and cost requirements.
The second, is the rise and fall selection method. That is, judge the input voltage first, because this circuit does a two-stage processing of the voltage, 80%, and the switching frequency of the two switching chips is different, and determine the rise or the fall after determining the output voltage