Introduction of the DC-DC Converter Inductor Selection Tool - Murata

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What is an inductor current ripple?The inductor current ripple refers to the size of the AC component to the DC component of thecurrent which flows into the inductor.* Keep in mind that the inductor current ripple is different than the "ripple rate" which is often mentioned inthe characteristics of DC‐DC converters.The "ripple rate" refers to the size of the noise component (fluctuation of voltage) which appears in the outputvoltage, and is different from the "Inductor Current Ripple" mentioned here.IRippleIppIdc[%]Ip-pIdcIrmsThis inductor current ripple becomes the index for setting the derating for the rated current of the IC.Also, there are the following relationships for the characteristics of DC‐DC converters.Relationship between Inductor Current Ripple and Stability & Fast ResponseRipple VoltageFast Response(Load Response Characteristics)Inductor current ripple High High GoodInductor current ripple Low Low PoorMoreover, the characteristics of an inductor are related to the inductance value, and have thefollowing relationships.Relationship between Inductor Current Ripple and Inductance ValuetInductor current ripple HighInductor current ripple Lowインダクタンス値LowHigh* For details, refer to the "Inductor Current Ripple (Max)" described on the following page.
Page 2 and 3: Having trouble selecting power indu
Page 4 and 5: 2 nd stepConfirming the Output Resu
Page 6 and 7: ■Current Wave formComparison betw
Page 8 and 9: ■Frequency -Loss CharacteristicsW
Page 10 and 11: The ideal power inductor can be sel
Page 14 and 15: ■Inductor Current Ripple (Want)MP

Introduction of the DC-DC Converter Inductor Selection Tool - Murata

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