关键词: 开关稳压器, 锯齿波振荡器, 下降延迟, 过冲补偿

Abstract: The switch regulator is widely used in various electronic equipments because of its low power consumption and small size.Sawtooth wave generator is an important component of switching regulator.It determinesthe precision ofthe duty cycle of the switching regulator.An inaccurate duty cycle will bring error to the final output.In this paper,a new sawtooth wave oscillator is proposed by using two triangle wave to synthesize sawtooth wave.It can effectively reduce fall time,amplitude error and frequency error of sawtooth wave signal compared to the commonly used sawtooth wave oscillators.The oscillator has been successfully applied to a DC-DCbuck switching powersupply chip.

Key words: switching regulator, sawtooth wave oscillator, falldelay, overshootcompensation