摘要
提出了一种应用PWM常用控制器SG1525实现PFM控制器的设计方法。首先分析了SG1525电路机理,给出了应用SG1525设计PFM控制器的思路,具体介绍了实现该控制器的外围电路及相关参数选取方法,最后通过分析该电路的时序图表明了该方法的可行性。
A design method of implementing the pulse frequency modulation( PFM) controller is proposed by using the common pulse width modulation( PWM) controller SG1525. The circuit mechanism of the SG1525 is analyzed,and the idea of designing the PFM controller with the SG1525 is given. The peripheral circuit and the related parameter selection method are introduced in detail. Finally,the feasibility of the method is demonstrated by analyzing the sequence diagram of the circuit.
引文
[1]郑新,李文辉,潘厚忠.雷达发射机技术[M].北京:电子工业出版社,2006.
[2]李定宣.开关稳定电源设计与应用[M].北京:中国电力出版社,2006.
[3]邹怀安,张锐,胡荣强.开关电源的PWM-PFM控制电路[J].电子质量,2004(3):21-22,34.