【选型】高导热、高绝缘性、高压缩比、超低硬度的导热垫片MCS30满足无刷鼓风机散热需求

时间： 2019-10-01 来源：世强

技术问答

对于很多无刷鼓风机控制板的设计中，很难保证所有元器件分布到PCB的同一面，这样就会带来另外一个问题，控制板散热需要接触到散热外壳成为难题，本文推荐PARKER CHOMERICS公司推出的MCS30 导热垫片，具有高导热、高绝缘性、高压缩比、超低硬度的特点，能够很好满足散热需求的该场景应用。

如下图所示的无刷鼓风机控制板，其背面有体积比较大的电解电容和线圈电感，无法通过接触散热外壳达到很好的散热效果，需要正面填充导热界面材料与散热外壳接触。经测试，MCS30可以比较完美的满足该场景的散热需要，下面就来简单分析MCS30具备的特性。

MCS30的典型性能如下图表所示，典型特点是导热系数3.0W/m-k，绝缘电压11KVac/mm，硬度shore 00为25，最大压缩比可达50%，提供0.5mm~5mm的厚度，形状尺寸可提供模切定制，工作温度-50~200℃，满足汽车级产品应用。

为什么要强调高导热、高绝缘性、高压缩比、超低硬度的特点，分析如下：

1、高导热系数，MCS30的导热系数为3.0W/m-k，该导热性能能够满足大多数应用，一般情况下，导热界面材料的导热系数越高，同样厚度下导热性能越好。

2、高绝缘性，器件与散热外壳，器件与器件之间不能因为增加了导热界面材料，而导致绝缘性能下降，带来额外的风险隐患。

3、高压缩比，对于这种应用，有器件的上方的导热垫片压缩比肯定远大于没有器件的导热垫片压缩比，而不能因为高的压缩比损坏导热垫片的结构特性。

4、超低硬度，因为需要比较高的压缩比，硬度越大的导热垫片，需要的压力越大，而不能应为增加了导热垫片，施加超出器件承受范围的外力损坏器件。

综上分析，Parker Chomerics公司推出的MCS30导热垫片所具有的特点，能够满足该类型产品应用。在汽车无刷鼓风机上的成功应用，也充分说明了其性能特点，类似应用都可以大胆尝试验证。

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应用笔记或设计指南 - PARKER CHOMERICS - 2022/2/17 PDF 英文下载