Research And Design Of High-Efficiency And Fast-Response BUCK Converter

As the development of the computer and electronic technology, the market of electronic product is more broad and the kinds is more, the connection of electronic device and the living is closer. None electronic device can work without reliable switch power supply and the demand on power supply is higher. The miniaturization and low cost bring the direction of light, smallness, thinness, and high efficiency.Fistly, the technology and trend in development of switch power supply is introduced.Then the structure, operation theory and basic control mode of the BUCK converter is introduced.Thirdly, for the sake of high efficiency and fast response, the solutions are given, and the design of the chip is determined. Then the working principles of the chip are also explained and the key parameter of the converter is defined. Next, the design procedure of some primary function blocks are presented, with the simulation by Hspice. The theories of other blocks are also presented simply.Finally, providing the typical application circuit as the foundation of the simulations for the whole chip, the results of the simulations prove the feasibility of the aforesaid methods.As switch power supply, The high efficiency is one of the most important design guidelines for DC-DC switching regulators all the time. In this thesis, the converter works in Hybrid mode and power save mode is able to obtain the high efficiency over the wide load range. Furthermore, the input-voltage feedforward control and out-voltage feedback control improve the transient response of the converter.The design is based on UMC 0.6 m BCD process. The simulation results indicate that the converter has fine efficiency up to 94%, a fast transient response, and small output ripple coefficient.