At first , the development and fundamental of monolithic switching power supply are presented in this thesis . then a novel monolithic switching power supply circuit only with four terminals is analyzed at detail . it uses pulse skip modulation and current - mode topology 論文研究了一種作為psoc原型電路的四端單片開關(guān)電源電路,此電路采用新型的跨周期調(diào)制模式,與傳統(tǒng)的脈寬調(diào)制模式相比,提高了輕負(fù)載下的工作效率;整體控制回路采用電流峰值控制模式。