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针对脉冲频率调制(PFM)开关电源(SMPS)集成电路,提出了抗电磁干扰(EMI)设计的两种方法。通过采用零电流检测电路,控制开关电源集成电路中的开关金属氧化物半导体场效应晶体管(MOSFET)在第一个谷底导通,从而降低导通电流的尖峰值。通过采用恒压和恒流设计技术,使开关电源集成电路中的电压和电流得到限制,有助于降低电流纹波。采用CSMC 1μm 40 V高压工艺设计了PFM开关电源集成电路SX1618,将以上两种抗电磁干扰设计方法应用在该电路的设计中,并设计了针对性的保护结构。完成SX1618整体仿真和版图设计后进行了流片和封装,并将其应用在实际的开关电源中,经测试,开关电源的抗电磁干扰能力符合标准。
For pulse frequency modulation (PFM) switching power supply (SMPS) integrated circuits, two approaches to EMI design are proposed. By using a zero-current detection circuit, the switching MOSFET in the switching power supply integrated circuit is turned on at the bottom of the first valley to reduce the peak value of the on-state current. Through the use of constant voltage and constant current design techniques, the switching power supply IC in the voltage and current constraints, help to reduce the current ripple. PFM switching power supply integrated circuit SX1618 is designed by CSMC 1μm 40 V high voltage process. The above two anti-electromagnetic interference design methods are applied in the design of the circuit, and the targeted protection structure is designed. Complete SX1618 overall simulation and layout design after the flow sheet and package, and its application in the actual switching power supply, the test, switching power supply anti-electromagnetic interference ability to meet the standards.