【成功案例】Laird磁珠替代0ohm电阻，改善车载仪表高频RE超标

时间： 2018-06-09 来源：世强

技术问答

目前市场上车载仪表逐步追求大屏化、复杂化，里面的电子元件日趋密集，系统速率越来越快、频率越来越高，辐射点和辐射量也越来越多，辐射问题成为车载仪表需要解决的重难点问题，需要高度重视。本文通过实际案例，阐述了LAIRD 磁珠在改善车载仪表高频RE（辐射）超标问题中的应用。

初始实验结果

本案例为车载仪表产品，在测试1G以上的高频段时，发现1.584Mhz（见下图）PK（峰值）值25.658db超标1.658db（限值线24db），平均值16.02db超标6db（限值线10db），测试不通过。

噪声来源分析

线简单的对仪表外接的线缆进行摆线（线缆摆放在不同位置），测试结果不变，说明噪声不是通过线缆辐射出来的，那大概率是机器主板辐射出来的。

通过使用EMI近场探头配合频谱仪进行近场探测，发现探头靠近微处理器ARM的时候，拾取到的噪声很大，怀疑是ARM内部线路产生，查找ARM的datasheet（见下面两幅图），发现ARM_CLK来源于System PLL，而System PLL又来源于PLL1（PLL1_sw_clk），而PLL1为792Mhz，刚好噪声是792Mhz的两倍频，因此1.584Ghz噪声的来源推断是ARM_CLK。

单独的ARM_CLK没有长的天线座载体应该不足以辐射出这么强劲的辐射量，果然，进一步近场测量发现R735/R738/R739这三颗0ohm阻抗上1.584Ghz噪声也非常强，说明电阻所在的PCB走线在ARM内部被耦合了来自ARM_CLK的噪声，并通过这三根PCB走线形成的天线辐射出来。

对策

为了阻挡噪声通过PCB走线发射，我们选用磁珠代替R735/R738/R739这三颗0ohm电阻，磁珠有很高的电阻率和磁导率，等效于电阻和电感串联，但电阻值和电感值都随频率变化，专用于抑制信号线和电源线上传输的高频噪声和尖峰干扰，高频噪声是叠加在直流传输电平上的交流成分，直流成分是有用信号，遇到磁珠时，高频噪声电流感受到电感和电阻串联而成产生的巨大阻抗从而以热量形式散发掉。

磁珠选择

首先需要关注磁珠的偏置电流参数，从下图可以看到，磁珠的特性是随着电流增加，其峰值阻抗会变小且峰值阻抗点的频率也会变高，因此我们应以噪声线的实际电流作为磁珠的偏置电流，来观测磁珠的阻抗频率曲线。

其次，使用磁珠的走线其有用信号频率下，磁珠所对应的阻抗必须小到不影响有用信号的质量，而在噪声频段，阻抗必须高。

最后是确定磁珠的尺寸，因为尺寸不同的磁珠在不同偏置电流和工作频率下的特性是不一样的，比如下面都标称600ohm@100Mhz的磁珠，1206尺寸的磁珠在低频100Mhz工作时阻抗值仅从0A下的600ohm减小到100mA偏置电流下的550ohm，而0402尺寸的磁珠阻抗值却从0A下的600ohm大幅减小为175ohm，由此可以推出，在低频大偏置电流应用下，应该选择大尺寸的磁珠，其阻抗特性会更好一些。

而磁珠工作在高频时，观察下图，1206尺寸磁珠从1Ghz下的阻抗从100Mhz下的600ohm减小为105ohm，而0402尺寸次之其1Ghz下的阻抗只由100Mhz时的600ohm减小为399ohm。

也就是说，低频大偏置电流下（比如电源线），我们应该选择尺寸较大的磁珠，而在高频应用中，我们应选择小尺寸的磁珠。

对应本次案例，是抑制信号线和控制线上的传播的高频噪声，线上电流只有几十毫安，属于低电流高频应用，因此需要选择尺寸较小的磁珠，我们选择了Laird制造的型号为 HZ0402A601R-10的磁珠，尺寸0402，工作温度-40°C至125°C，最大通流能力100mA，最大直流电阻1ohm，详细规格如下：

从下图可知，这颗磁珠1Ghz以上的高频阻抗在不同的偏置电流下趋于一致：

从下图可知，1.584Ghz对应的阻抗约为200ohm，此阻抗下可以产生较多的噪声衰减，符合要求。

R735/R738/R739全部换上此型号磁珠后进行实际测试，结果显示噪声得到了明显抑制（数据下图），PK值从25.658db下降到约18db，平均值（AVG）从16db降低到9.5db，测试通过，可见这颗Laird的磁珠可以作为这次仪表辐射超标问题的最终对策。

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全部评论（35）

用户48282835 Lv4. 资深工程师 2020-02-18

nice
牵着蜗牛散步 Lv6. 高级专家 2018-12-30

不错
丸子 Lv3. 高级工程师 2018-12-26

支持
海锋 Lv9. 科学家 2018-12-18

学习了
梁大叔 Lv6. 高级专家 2018-12-17

收藏一下

Lcf Lv7. 资深专家 2018-12-12

不错的资料，收藏一下，后续有需求的时候作为参考。谢谢！
小小的 Lv6. 高级专家 2018-12-03

好东西，学习了
百合 Lv7. 资深专家 2018-11-30

不错
kathy11166 Lv4. 资深工程师 2018-11-16

学习了
射频 Lv7. 资深专家 2018-11-13

真不错，以后设计的时候可以参考

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【选型】Laird（莱尔德）磁珠/磁环选型指南（中文）

目录- 铁氧体材料阻抗对比设计和选择的经验法则高频柱状磁芯高频分离,可拆卸磁芯宽带柱状磁芯宽带分离,可拆卸磁芯宽带磁芯参考图表低频柱状磁芯宽带带状可弯曲线缆磁芯宽带可拆卸带状和弯曲线缆磁芯铁氧体 EMI 圆盘和方盘用于无线充电的铁氧体板柔性铁氧体片磁芯样本套件列表

型号- 28B1225-000,28S2022-0M0,MHLL5040-000,28B0390-200,28R0592-010,MP1040-300,MSLL5040-200,28B0375-000,HFB143064-000,28R0610-000,28S2011-0P0,28R0852-500,MHLL6060-300,28B0592-000,28R1775-000,28A2024-0A0,28A2024-0A2,28R1953-000,LFB259128-000,28B0591-200,28A5131-0A2,28B1000-000,HFB170070-100,MP2170-1M0,28R1236-000,28R2170-000,28R0315-200,MULL6060-300,28B0250-100,28B1225-100,28R0480-000,28B0870-100,28R1518-000,28A2307-0A2,28B0734-000,28B0375-100,28B0999-000,LFB310190-000,HFB143064-100,28B0394-000,28B0315-100,28R1127-200,MP1040-200,MULL5040-000,28R1340-200,28B0629-000,HFB123049-000,28A0640-0A,HFB075024-000,28B0452-000,28R0614-100,28S2011-0M0,28A2809-0A2,28S2827-210,33P3839-0M0,HFB150070-200,28B0157-100,28A2025-0A,MSLL12060-000,28R1418-000,HFA150068-0A2,MM0650-100,HFB170070-000,28B0631-000,28R0900-100,28A3851-0A2,28R1779-000,28B0339-000,MHLL,28B1250-000,28R0480-100,28R2000-200,28A0434-0A2,28R1417-000,28R1240-010,28A0807-0A2,MP0433-000,HFB0473-200,HFA163090-0A2,28B0315-000,28B0625-000,MP1040-100,28R1340-100,33P2098-0M0,HFB123049-100,28A2025-0A2,28B1540-000,28A2738-0A2,28B0384-000,LFB143064-100,28R1261-100,28B0886-20H,28B0563-100,MP1496-000,28R0492-100,28R1227-100,28R0669-000,28S2022-0P0,28A2025-0A0,28B0631-100,28R0898-100,28A1507-0A2,HFB157070-000,LFB159079-000,28R1450-100,MP0315-200,28B0395-000,28B1225-300,28S0670-000,28B0485-000,28B1020-100,28B0625-100,28R1101-000,MULL12060-200,28R1127-000,28B0562-300,28R1022-000,28R1517-000,HFB259128-100,MP0350-000,28R1476-100,MULL5040-200,HFA100049-0A2,28B1142-100,28R0614-300,28B0686-000,28R0983-000,28A2432-0A2,28B0570-000,LFB143064-000,28A0640-0A2,LFB250150-000,28A0392-0A,28B0563-200,28B0141-000,28B0453-000,28A0350-0B2,LFB090050-000,HFA259131-0A2,28A0640-0A0,28A2029-0A2,MSLL12060-200,MSLL6060-300,28A2029-0A0,28S2001-0,28R1102-100,28B0268-000,28A2913-0A2,HFB160093-300,28B0470-000,LFB220140-000,MULL,28R1319-000,MP0591-200,HFB095051-200,28S2001-0P0,HFA187102-0A2,28B0773-050,HFB152034-000,28A2026-0A2,28B0375-400,28S2012-0M0,28B0384-200,28B0472-090,28R1127-500,28B0473-200,28R3149-000,28B0562-200,28B0735-300,28B0616-000,MP1496-0M0,28B1142-000,MP0512-200,28B0686-100,28B0825-000,MHLL12060-200,HFB123049-300,28R0945-000,28A0593-0A2,28B0474-000,28A5776-0A2,28R1457-400,28R0880-000,28R0453-200,LFB180100-000,28B2000-100,28B0250-700,28B0590-000,28B0500-100,LFB290190-000,28R1102-000,28R0756-000,28S2001-2A2,28A0392-0A0,28A0392-0A2,28R1862-000,MM0787-200,28R0984-000,MULL12060-000,HFA150066-0A2,28A4155-0A2,28B0672-000,28B0296-000,28S2011-0,28B0562-100,28B0686-200,28B0473-000,MP3940-0M0,28R1261-200,28R0453-300,28B0563-000,28R1025-000,MP2106-0M0,28B1122-100,28R0898-200,HFA100035-0A2,HFB159079-100,28S2022-0,LFB127079-000,28R1262-000,LFB360230-300,MSLL,MM1400-300,28A2029-0A,28B0870-000,MHLL5040-200,MM0787-100,28R2170-100,HFB143064-200,MSLL5040-000,MP1040-3M0,28B0275-000,28A0592-0A2,LFB095051-000,28R1128-100,28B0562-000,28B2400-000,MHLL12060-000,MP2126-0M0,HFB187102-100,28R1779-100,28S2001-0M0,28A2736-0A2,MP0590-200,28R1141-010,MP0760-100,28B0500-300,HFB160093-200,MM1400-200,LFB187102-000,28R0756-200,28R1103-000,HFB095051-100,28A3039-0A2,28B0434-000,28B0375-300,28R0984-200,28B1531-000,28A2024-0A,28A2005-0A2,28R1127-400,HFB100035-000,28R1128-200,28B1417-200,28B0735-000,HFB143064-300,28R1024-000,28B0355-000,28R1654-010,28B1122-300,28R0825-000,28S2023-0M0,LFB174095-000,28R1496-000,28R1262-200,28R0394-000

选型指南 - LAIRD - 2017年 PDF 中文下载

WHITEPAPER: How to Specify Inductive Components in Power Electronics: Types, Specifications, and Uses

白皮书 - LAIRD - 2021/10/1 PDF 英文下载

莱尔德收购斯特华Steward，新增磁珠磁环电感产品

莱尔德全线收购斯特华Steward，斯特华是莱尔德集团的第五个事业部，致力于磁性材料的应用开发，主要生产软磁铁粉、磁芯和以软磁为主体的电子元器件，产品被广泛应用在数码电子、家用电器、复印机、通讯、军事和汽车行业。

行业资讯发布时间 : 2018-08-25

Laird（莱尔德）EMI滤波器和射频电感器选型指南

目录- Part Number Nomenclature Explanation Ferrite EMI Chip Beads Ferrite EMI SMT Bead Assemblies Common Mode And Differential Mode Introduction Common Mode Choke DIFFERENTIAL MODE EMI FILTERS INDUCTORS

型号- LI1806E800R-10,CPI1008K1R5R-10,LF1206A302R-10,28C0236-0JW-10,LI0402E800R-10,HI0805P390R-10,HZ0603C601R-10,MI0805K601R-10,IC1206B821R-10,MI1206L501R-10,HZ0603B751R-10,IC0603B820R-10,MI0805L301R-10,LI0603E151R-10,IC0805B222R-10,LF1206E152R-10,CMX1211Z601B-10,MI0603J601R-10,CM0805A371R-10,28L0138-80R-10,HZ0805D102R-10,IC0805B102R-10,HI2220R181R-10,CM1812C282R-10,29F0428-0T0-10,29F0430-2SR-10,CM0805B361R-10,CM5740Z171R-10,MI0805K110R-10,CM0805C161R-10,CM2824E352R-10,MI0603L221R-10,IC0805A333R-10,CM5740Z171B-10,CM2021Y330R-10,29F0818-0SR-10,LI0402E190R-10,CMX1616Z401B-10,IC0805A472R-10,CM4440Z121R-10,HZ0402A152R-10,HZ0603A102R-10,CPI0806KR68R-10,MI0402L100R-10,IC0603A152R-10,HI1206T500R-10,CMX1616Y222B-10,LI0805H151R-10,HZ0603A222R-10,MI0603K300R-10,CM3032V201R-10,MI0805K400R-10,CM5740Z241B-10,MI1206K260R-10,DA1206D301R-10,CM1206A601R-10,CPI0805F2R2R-10,HI0805P121R-10,MI1206L601R-10,MI0603J102R-10,28L0138-10R-10,HR2220P601R-10,CMX1616Z162B-10,28L0138-40R-10,HZ1206C202R-10,IC0603A821R-10,CM3822R201R-10,IC0603B181R-10,HI0603R300R-10,IC0805A223R-10,CPI0806J1R0R-10,IC1206A103R-10,CM4732V301R-10,MI0402K121R-10,HI2220P251R-10,29F0418-0SR-10,MI0805M221R-10,35F0121-1SR-10,CMX1211Z181B-10,HZ0402A182R-10,HZ1206E601R-10,CMX1616Z112B-10,CPI1008KR82R-10,CF0805D670R-10,HI0805Q310R-10,IC0603A102R-10,MI0603K181R-10,MI0603J600R-10,CC2824E513R-10,CM3440Z171B-10,HI1612X560R-10,IC0805A821R-10,HI0805O121R-10,CF0805,HI2220Q401R-10,MI0603J471R-10,HI0603N330R-10,CMX1616Z171B-10,HZ0402A601R-10,IC0805A183R-10,HI0805R121R-10,HZ0402B102R-10,CM3440Z171R-10,CM4545Z131R-11,CM4545Z131R-10,CH0805D900R-10,HZ0603D102R-10,LI0603G121R-10,CM3822R151R-10,CPI0805H1R2R-10,CPI1008K1R2R-10,LI0402E300R-10,LI0402E750R-10,CM2824E182R-10,IC0603B470R-10,28C0236-0EW-10,LI1812D121R-10,CM3032V121R-10,29F0430-4SR-10,CPI0806J1R8R-10,IC1206B153R-10,LI1206H151R-10,CM4545Z131B-10,HZ0603C651R-10,HI0805T500R-10,CC2824D225R-10,IC0805B331R-10,CF0504C121R-10,CMX1211X132B-10,29F0818-1SR-10,CC1812,LI0603G221R-10,LI1806C151R-10,CF0805D900R-10,HZ0805B252R-10,CPI0806KR82R-10,CC2824E105R-10,IC0805A272R-10,MI1206L391R-10,CMX1211Z321B-10,CM5441Z101B-10,CPI1008J4R7R-10,LF0805A252R-10,IC1206A333R-10,HR2220V801R-10,IC0805C680R-10,LI1806E101R-10,HZ0603A182R-10,LI0402B800R-10,28C0236-0BS-10,CM5022R201R-10,MI0805L601R-10,CF0805C221R-10,CC2824E253R-10,CC2824J502R-10,CPI0805G1R5R-10,CM2722R201R-10,HI0603O700R-10,LI0402C470R-10,IC0603A182R-10,29F0330-2SR-10,CPI0805E4R7R-10,CM2545X171R-10,HI2220P171R-10,29F0528-0T0-10,MI0603M121R-10,HZ0805G471R-10,HZ1206D102R-10,LI0603D301R-10,CM0805D900R-10,IC0603A103R-10,IC0805A822R-10,MI1206K900R-10,CM3822R800R-10,CM4732V201R-10,CC2824E474R-10,HI1806N910R-10,28F0181-1SR-10,CC2824E113R-10,CM5022R151R-10,HI1206T161R-10,HI2220R151R-10,LI0805H400R-10,CM2824B103R-10,CPI0805H1R0R-10,LI0805G201R-10,CPI1008K1R0R-10,MI0603L301R-10,DA1206E300R-10,IC0805A153R-10,CPI1008J2R2R-10,HI3312X101R-10,LI0402E600R-10,CM3032V301R-10,MI1806J800R-10,HI1206N800R-10,HZ1806K102R-10,MI0805L331R-10,CPI0806J1R5R-10,HZ0603B471R-10,IC0603A681R-10,CM4545X131R-10,CM2545X171B-10,HZ0805E601R-10,HI0805N600R-10,CPI0805JR47R-10,HZ0603B102R-10,CM0805B501R-10,HZ0805B272R-10,29F0418-1SR-10,IC0805B332R-10,LI0805G301R-10,MI0805J102R-10,HI2220R301R-10,LI0603B201R-10,HZ0603A252R-10,CM2824E702R-10,IC0603A472R-10,LI0402C221R-10,LI0805H121R-10,CM4545X131B-10,HI0805N310R-10,HI1806T600R-10,HI2220T101R-10,CPI0806KR47R-10,28C0236-0DW-10,DA1206D600R-10,CM0805C221R-10,CC2824,29F0303-0T0-10,CPI0806J3R3R-10,HZ1206E152R-10,MI0603K471R-10,CC2824B475R-10,HI2220P701R-10,CC2824E471R-10,28L0138-70R-10,CPI0805E3R3R-10,DA1206B601R-10,CM0805C601R-10,IC1206B331R-10,CPI0805G1R8R-10,35F0121-0SR-10,CM5441Z161B-10,CM1206C161R-10,HZ0805D152R-10,28C0236-0BW-10,IC1206A332R-10,CH0805,CPI0806J1R2R-10,CPI1008KR68R-10,HI2220P601R-10,CPI0805JR68R-10,MI1812K121R-10,HI0805R800R-10,IC0805A681R-10,CMX1616X282B-10,HI1206N680R-10,HZ0603B112R-10,HI2220P551R-10,CC1812C513R-10,CPI1008K1R8R-10,CM5022R800R-10,CMX1211Y801B-10,LI0402B301R-10,28L0138-50R-10,HI0805N221R-10,28F0121-1SR-10,IC0805C470R-10,LF1206C202R-10,CPI0805IR82R-10,DA1206B102R-10,IC1206A472R-10,MI1206K601R-10,CM6032V201R-10,HI0603N300R-10,HZ0603A152R-10,CM4440Z111R-10,HI0603P600R-10,HZ0603C152R-10,LI0603G800R-10,IC0805B101R-10,CM5441Z161R-10,CMX1211Z680B-10,HI1812T800R-10,MI0603J680R-10,28F0121-0SR-10,HZ0805C202R-10,CM6032V301R-10,CPI0806J2R2R-10,CM3421Y600R-10,CPI0806J4R7R-10,HI1206N101R-10,LI0402D121R-10,LI0805H750R-10,29F0328-0T0-10,DA1206C121R-10,MI1206K310R-10,LI0402C220R-10,HR2220V701R-10,CM2722R151R-10,IC0805A103R-10,CM0805,CPI1008KR47R-10,CM2722R800R-10,LI1206H121R-10,CMX1616Z701B-10,CF0504C900R-10,HI2220P271R-10,CF0805D121R-10,CPI1008J3R3R-10,CF0504,IC1206B183R-10,LI0603E470R-10,CMX1211W182B-10,IC0805B182R-10,HI1206P121R-10,HI1812V101R-10,29F0429-0T0-10,IC0805B122R-10,HZ0805B222R-10,MI1210K600R-10,29F0318-1SR-10,CF0805D181R-10

选型指南 - LAIRD PDF 英文下载

Laird铁氧体磁珠选型表

Laird铁氧体磁珠选型表提供信号线用铁氧体磁珠，电源线用铁氧体磁珠，铁氧体4线磁珠，低频磁珠，铁氧体EMI芯片磁珠选型。

产品型号	品类	EIA Pkg.Size	Metric Pkg. Size	Typical Impedance (Ω)Z @ 25 MHz	Typical Impedance (Ω)Z @ 100 MHz	Typical Impedance (Ω)Z @ 500 MHz	Typical Impedance (Ω)Z @ 1 GHz	Typical Peak Impedance (Ω)	Peak Impedance Frequency (MHz)	DCR MAX(Ω)	RATED I MAX(continuous) mA
MI0402L100R-10	FERRITE EMI CHIP BEADS FOR POWER LINE	0402	1005	3.6	10	14	13.2	15	510	0.10	2000

选型表 - LAIRD 立即选型

汽车电子抗电磁干扰和散热问题难解决？莱尔德帮你搞定！

二十年来，莱尔德材料科学专家成功为领先的汽车供应商们解决了复杂的电子设计难题，所提供的方案能够高效解决电磁干扰和散热的要求。作为专业的电磁屏蔽和散热解决方案设计者，莱尔德帮助客户的设计师避免精力和成本浪费，加快关键汽车零部件推向市场的时间。

厂牌及品类发布时间 : 2021-06-26

BLM18KG121TH1，BLM18KG121TN1D 这两个有啥区别呢？

BLM18KG121TH1D是车规品，BLM18KG121TN1D是非车规品，世强也有供应Laird的磁珠，规格十分丰富，具体可参考如下链接：https://www.sekorm.com/doc/83636.html

技术问答发布时间 : 2018-09-05

EMI NOISE FILTERING AND POWER MAGNETIC Solutions

型号- IPSF732,HFA,CPI1008 SERIES,CPI1008,TYS4018,HF SERIES,IPSH5D18,CM8663,IPUD5022H,MULL SERIES,MULL,CM7060,IPUD5022,SWC4242KB120-100,MGV0412,CM1206 SERIES,IPSF728,TYS4012,IPSF1045,IPSF745,IPSF625,IPSH125,IPSH127,28M SERIES,IPSH124,IPSH5D28,CM0805 SERIES,CM7060 SERIES,IPUD52,IPUD53,IPUD54,MHLL SERIES,28A SERIES,CPI0805 SERIES,MGV0402,IPSD1608,TYS4020,TYS6045,RWC2727AH070-300,CF0504 SERIES,IPSR63C,IPSH4D28,IPSR63L,IPSR126,TYS4030,IPUD3308,IC1206,IPSR62C,IPSH104,IPSH64,IPSH103,MGV1004,IPSH62,IPSH105,IPSR62L,MM SERIES,CPI0805,CPI0806,IPSD63,IPSH2D18,IPUD3316H,SWC4848KA100-600,IPUD3316,IPSD5022,IPUD73,IPUD75,IPUD1813,28 SERIES,MHLL,IC0805,MSLL,IPSH74,IPSF1255,IPSH73,IPSD74,IPSH6D28,IPSR104,38F0126-0SR-1XXXX,TYS5020,IPSR106,MP SERIES,IPSF,IPSD,IPSH8D43,IPSD3316,IPSH,SWC10056AA120-500,MSLL SERIES,IPSH4D18,SWC5547AK120-500,CMX1211 SERIES,CMX1616,IC0603 SERIES,RWC5353EJ240-501,CF0805,IPSH6D38,CF0805 SERIES,IPUD105,TYS3012,CMX1211,28A,TYS3015,MGV0605,RWC5353EJ240-500,TYS3010,MGV0602,IP SERIES,MGV0603,IPSF1275,28M,IPUD104,28S SERIES,CM8663 SERIES,IPSH3D16,28S,TYS5040,RWC5050AK060-500,IPUD,IPUD42,IPSH8D28,IPUD43,IPUD3340,MGV0512,MGV1205,1XC,IC0805 SERIES,IPSF628,MGV1207,CM0805,IPSR,IPSD105,IPSF1265,CF0504,IC1206 SERIES,1XC SERIES,IPUD1608,LF SERIES,HFA SERIES,CMX1616 SERIES,TYS6020,TYS8040,IPUD32,CPI0806 SERIES,CM1206,MGV0502,33 SERIES,IC0603,TYS6028,MGV0503,MGV0625

商品及供应商介绍 - LAIRD - FEB 2022 PDF 英文下载