DC - DC转换器消除末的EMI

摘要：提到的EMI所有的电子系统，其中包括开关稳压器发出的有害电磁辐射。采用扩频脉冲宽度调制控制计划（SSPWM）增强的EMI抑制。驾驶与伪随机噪声（PN）的外部时钟输入引脚的MAX1703DC-DC转换稳压器提供了降低EMI的扩频时钟。遍布广泛的干扰频率降低EMI的功率密度，否则集中在一个单一的时钟频率。

Maxim>AppNotes>CIRCUITPROTECTIONPOWER-SUPPLYCIRCUITSKeywords:EMI,radiation,suppression,SSPWM,spread-spectrumpulse-widthmodulation,electromagneticMay28,2002interference,MAX1703,dc-dcconverter,dcdcconverters,convertorsAPPLICATIONNOTE1077DC-to-DCConverterCombatsEMIAbstract:UnwantedelectromagneticradiationreferredtoasEMIisemittedbyallelectronicsystems,includingswitchingregulators.Adoptingspread-spectrumpulse-widthmodulation(SSPWM)asacontrolschemeenhancesthesuppressionofEMI.DrivingtheexternalclockinputpinoftheMAX1703DC-DCconverterwithapseudo-randomnoise(PN)providestheregulatorwithaspreadspectrumclockthatreducesEMI.SpreadingtheinterferencefrequenciesoverawiderangelowerstheEMIpowerd