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The control architecture of a DC/DC Buck converter determines when to turn on and off its power MOSFETs to perform the necessary power conversion. The two main common control architectures in DC/DC Buck converters are the Peak Current Mode control and Constant On-time, or COT, control. There are advantages and disadvantages of using one control architecture over another. In Peak Current Mode control, some of its advantages are that it is easier to create a mathematical model since it can be approximated as a linear system. Also, DC/DC converters using Peak Current Mode control have an easier time to run in 100% duty cycle, which means the high-side power MOSFET (Q1) is always on. This is useful because the output voltage can still maintain regulation as the input voltage falls closer to the output voltage. One potential disadvantage is that the Peak Current Mode control architecture requires loop compensation for stability. In Constant On-time control, some of its advantages are that, since it is using hysteretic control, it has inherent stability. It also has the fastest load transient responses at around 50% duty cycle. However, at high duty cycle operation, COT’s transient response can be slow. In addition, COT designs rely on being able to detect some output voltage ripple to function properly. Therefore, it is more sensitive to noise that may be introduced to the system.
