【选型】如何区分和选择功率电感两种额定电流Isat、Irms？

时间： 2019-01-04 来源：世强

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在DCDC转换器中，功率电感是非常重要的一个元件。选择合适的电感，是获得较高效率的关键原因之一。我们在选择功率电感时，常常考虑感值，电流，直流电阻等参数。其中关键的额定电流有两种，它们有什么差异，又该如何选择呢？

通常我们以Isat和Irms作为标记，来区分两种额定电流，工程师们也会经常遇到这两个技术参数。如果，将两者电流混淆，会造成严重的电路问题。

Isat是指电感的饱和电流，它是以电感值的下降程度为指标的额定电流，超出该范围使用时，可能会由于纹波电流增加而导致IC控制不稳。大部分电感厂商一般取电感值下降到20%的电流为Isat，也有少量厂商设为下降30%或者10%，所以选型时要特别注意这一点.此外，根据电感磁路构造的不同，磁饱和的倾向（即电感值的下降倾向）也有所不同。

Irms是指电感产品的应用额定电流，也称为温升电流，即产品应用时，表面达到一定温度时所对应的DC电流。业界大部分厂家一般认为是电感产品自我温升温度不超过40度时的电流。

知道了上述两个电流的差异后，我们以LAIRD MGV系列功率电感为例，假如需要一个4.7Uh,0402封装，饱和电流3A，温升电流2A的功率电感。我们先看MGV0402系列：

根据上面的参数和理解的电流，显然可以选定MGV04024R7M-10型号，满足需要的参数要求。另外，Laird功率电感MGV全系列最小尺寸0201，宽阻抗范围10-3000Ω，额定电流高达75A，同品质价格低10%，有其他参数要求的工程师们也可以多多关注。

目前，世强已全面代理Laird产品线，如果你想了解更多的Laird产品信息或使用方法，请留言或电话联系世强400-887-3266。

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全部评论（8）

用户29991400 Lv4. 资深工程师 2020-02-20

学习了
用户14344505 Lv7. 资深专家 2019-05-04

学习
鄗立恒 Lv8. 研究员 2019-01-04

学习了
沉浮 Lv7. 资深专家 2019-01-04

已收藏
龙言无忌 Lv7. 资深专家 2019-01-04

不错

周鑫 Lv8. 研究员 2019-01-04

好好学习
用户56731903 Lv9. 科学家 2019-01-04

不错的资料！！！
行行摄摄 Lv7. 资深专家 2019-01-04

学习一下

没有更多评论了

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MGV0312R22M-10	High current power inductors	0.22	0.2	17	10	6.5

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Laird（莱尔德）MGV高电流和薄型SMD功率电感器选型指南（英文）

目录- High current power inductors Product introduction High current power inductors Selection Guide High current power inductors PACKING INFORMATION High current power inductors SAMPLE KIT LISTS

型号- MGV1205150M,MGV12073R3M-10,MGV0503330M-10,MGV12075R6M,MGV05026R8M-10,MGV0603150M-10,MGV0605150M-10,MGV1207R22M,MGV06251R0M-10,MGV0503R47M-10,MGV03023R3M-10,MGV12053R3M-10,MGV1707100M,MGV1707560M,MGV0412,MGV1707330M,MGV03021R2M-10,MGV05022R2M-10,MGV06038R2M-10,MGV0603R22N-10,MGV06058R2M-10,MGV05024R7M-10,MGV0603R33M-10,MGV0625R10N-10,MGV1205220M-10,MGV1207R47M,MGV1207220M-10,MGV0302R82M-10,MGV1707680M,MGV1205R82M-10,MGV0402,MGV12053R3M,MGV1707220M,MGV170,MGV05021R5M-10,MGV12071R0M,MGV04124R7M-10,MGV1207R82M-10,MGV1707220M-10,MGV1207R15M-10,MGV0412R68M-10,MGV03021R5M-10,MGV0512100M-10,MGV05023R3M-10,MGV1207R22M-10,MGV17073R3M-10,MGV1207R68M,MGV1207R56M,MGV04122R2M-10,MGV12071R5M-10,MGV0402R10N-10,MGV06056R8M-10,MGV06031R5M-10,MGV17072R2M,MGV0312,MGV12052R2M-10,MGV12056R8M-10,MGV1207100M,MGV17071R5M,MGV06052R2M-10,MGV1207330M,MGV17071R5M-10,MGV0302100M-10,MGV1207100M-10,MGV0605R68M-10,MGV031,MGV04126R8M-10,MGV1004R56M-10,MGV10041R0M-10,MGV12054R7M-10,MGV1207R30M-10,MGV10045R6M-10,MGV1207R33M,1004,MGV1707100M-10,MGV1707101M,MGV06054R7M-10,MGV0302,MGV1207220M,MGV1707820M,MGV1707470M-10,MGV17076R8M-10,MGV0503R56M-10,MGV17074R7M,MGV06021R0M-10,MGV06033R3M-10,MGV10044R7M-10,MGV04121R0M-10,MGV0503100M-10,MGV0503R10N-10,MGV05021R2M-10,MGV05031R2M-10,MGV10041R5M-10,MGV06055R6M-10,MGV10042R2M-10,MGV06051R0M-10,MGV12076R8M,MGV12071R8M-10,MGV12078R2M,0605,0602,0603,MGV1207150M-10,MGV12071R5M,MGV0302R47M-10,MGV0625R33M-10,MGV12072R2M,MGV0312100M-10,MGV1205R47M-10,MGV1207R47M-10,MGV05121R0M-10,MGV1207R82M,MGV1205R33M-10,MGV0302R22N-10,MGV12058R2M-10,MGV12078R2M-10,MGV1207330M-10,MGV10046R8M-10,MGV1707470M,MGV1205330M-10,MGV0603220M-10,MGV0605220M-10,MGV1207R15M,MGV1004220M-10,1707,MGV0603R82M-10,MGV0605R82M-10,MGV1004R22M-10,MGV12071R8M,MGV0605R22M-10,MGV12051R5M-10,MGV1205R22M-10,0502,MGV05033R3M-10,MGV0602R22N-10,MGV06252R2M-10,MGV1004470M-10,MGV12054R7M,MGV04121R5M-10,MGV06051R5M-10,MGV0402100M-10,MGV06036R8M-10,MGV04021R2M-10,MGV1205,MGV06256R8M-10,MGV0512R47M-10,MGV03123R3M-10,MGV1207,0503,0625,MGV06032R2M-10,MGV0412R22M-10,MGV06254R7M-10,MGV04023R3M-10,MGV0412220M-10,-530 MGV IND,MGV1207R68M-10,MGV12055R6M-10,MGV17072R2M-10,0512,MGV0402R56M-10,MGV06034R7M-10,MGV17074R7M-10,MGV0302R68M-10,MGV17071R0M,MGV0602R47M-10,MGV05036R8M-10,MGV04024R7M-10,MGV03122R2M-10,MGV03121R5M-10,MGV0625220M-10,MGV1205R33M,0402,MGV0512R68M-10,MGV1707560M-10,MGV04021R5M-10,MGV0502R47M-10,MGV0602150M-10,MGV12055R6M,MGV12075R6M-10,MGV0312R22M-10,MGV1207150M,MGV0503R22M-10,MGV03126R8M-10,MGV06253R3M-10,MGV03021R0M-10,MGV12051R0M-10,MGV12071R0M-10,MGV1205220M,MGV0603R47M-10,MGV12051R0M,MGV12073R3M,MGV0402220M-10,MGV17071R0M-10,MGV0512150M-10,MGV0602R68M-10,MGV1205R68M,MGV1205R56M,MGV0503150M-10,MGV04022R2M-10,0412,MGV03124R7M-10,MGV04026R8M-10,MGV0605470M-10,MGV0603470M-10,MGV0603330M-10,MGV0302R10N-10,MGV0625R82M-10,MGV0512R10N-10,MGV0625R22M-10,MGV1004100M-10,MGV1004R47M-10,MGV0402150M-10,MGV1205R47M,MGV10041R2M-10,0302,MGV0512R22M-10,MGV06021R5M-10,MGV05121R5M-10,MGV10043R3M-10,MGV05032R2M-10,MGV1004,MGV0602R10N-10,MGV0603100M-10,MGV05034R7M-10,MGV0602R33M-10,MGV06251R5M-10,MGV05021R0M-10,MGV1205R22M,MGV0503R68M-10,MGV0602220M-10,0312,MGV0412R47M-10,MGV1207R56M-10,MGV1205R68M-10,MGV0625100M-10,MGV1205330M,MGV1004R20N-10,MGV1205100M,MGV0402R22N-10,MGV0402R68M-10,MGV1707101M-10,MGV06053R3M-10,MGV0312R82M-10,MGV0502R10N-10,MGV06023R3M-10,MGV0502100M-10,MGV1707330M-10,MGV0412R10N-10,MGV04121R2M-10,MGV1707,MGV0412100M-10,MGV0503R82M-10,MGV05124R7M-10,MGV12051R8M-10,MGV06031R0M-10,MGV0625150M-10,MGV1205150M-10,MGV0603R10N-10,MGV1707150M-10,MGV17076R8M,MGV0602100M-10,MGV04123R3M-10,MGV1207R33M-10,MGV0502R68M-10,MGV05031R0M-10,MGV1207R30M,MGV1004R36M-10,MGV05123R3M-10,MGV06024R7M-10,MGV0503R33M-10,MGV0625R47M-10,MGV1004330M-10,MGV1707820M-10,MGV12051R5M,MGV0602R56M-10,MGV1207470M-10,MGV0605,MGV0312R68M-10,MGV0602,MGV0603,MGV12052R2M,MGV1004R19N-10,MGV05126R8M-10,MGV03022R2M-10,MGV12074R7M,MGV05121R2M-10,MGV0402R47M-10,MGV1004150M-10,MGV06258R2M-10,MGV12076R8M-10,MGV1205R82M,MGV1707150M,MGV0512,MGV03026R8M-10,MGV03121R0M-10,MGV0503220M-10,MGV1207R40M-10,MGV12051R8M,MGV12072R2M-10,MGV06022R2M-10,MGV17073R3M,MGV1707680M-10,MGV0312R47M-10,MGV05031R5M-10,MGV05122R2M-10,MGV1205100M-10,MGV06021R2M-10,MGV0605100M-10,MGV1205R56M-10,MGV06026R8M-10,MGV0603R68M-10,MGV1207R40M,MGV04021R0M-10,MGV12056R8M,1205,MGV0605R56M-10,MGV12058R2M,MGV1004R15N-10,MGV0502,MGV1207470M,MGV0625R68M-10,MGV,MGV12074R7M-10,MGV0503,MGV0625,1207,MGV03024R7M-10

2019/1/18 - LAIRD - 选型指南代理服务技术支持现货查询批量订货