SLVAFD5 December 2022 TPS562211 , TPS562212 , TPS563211 , TPS563212
The output voltage transient of a buck regulator during a load current step is often a key performance specification.While there are many types of control topologies addressing special design challenges for non-isolated DC/DC converter, including Voltage-mode control, peak current mode control, constant on-time (COT) control, D-CAP2 control mode a variation of adaptive constant-on time control mode, advanced emulated current mode (AECM).
No single control topology is a good fit for all applications. The various control modes each has unique advantages. This note, we will provide a performance comparison of DC/DC converters operating in three different modes: PCM control mode, D-CAP2™ control mode (a derivative of constant on-time), and AECM control mode. These three control modes were all used widespread, none of these control modes require loop compensation which making the design simple.