摘要
本文提出一种可以根据负载变化自动切换等效工作频率的PWM/PFM双模型boostDC-DC电源芯片的电路结构,使得芯片同时具有PFM高效和PWM低纹波的特点。与此同时,采用有效的相位补偿技术解决PWM方式下很可能出现的自激问题。本文在这种结构下并采用流片厂提供的模型参数,对芯片本身及其典型应用电路进行模拟。该芯片可广泛应用于各类便携式电子系统中,更可以作为IP核,嵌入同种工艺下的其它芯片。
This paper proposes a new circuit that can switch from PWM to PFM or vice versa due to the loading so that it can have the advantages of both of the low ripple of PWM and high efficiency of PFM. At the same time,this paper uses a new method of phase-compensation to solve the self-oscillating phenomenon usually occurred in PWM. A boost DC-DC converter is designed by a newly developed method of both PFM and PWM.The circuits of this chip and the whole application system are simulated ,using the parameters of the foundry. This kind of chips is suitable for the portable electronics,and can be embed in other chips as a IP core.
出处
《微电子学与计算机》
CSCD
北大核心
2003年第5期51-54,共4页
Microelectronics & Computer
