【产品】结电容低至0.35pF汽车级瞬态抑制二极管为汽车电路提供电源保护,接口保护,防浪涌保护

时间： 2016-03-16 来源：世强作者：小松鼠

技术问答

摘要

现在汽车电子发展越来越快，汽车电路需要实现的功能更加丰富，同时电路接口也会增加。为保护汽车的安全性，需要在汽车电路系统中增加不同的保护方案。本文介绍了汽车电路中的电源保护、接口保护、防浪涌等需求，以及LITTELFUSE 的TVS管在这些需求中的具体应用。。

汽车电路保护

汽车整车电路通常由电源电路、起动电路、点火电路、照明与灯光信号装置电路、仪表信息系统电路、辅助装置电路和电子控制系统电路组成。在众多的电路系统中，LittelFuse可以实现过压、过流、防冲击等不同的保护功能。

LittelFuse的TVS管是在稳压管工艺基础上发展起来的一种新产品，其电路符号和普通稳压二极管相同,外形也与普通二极管无异。当TVS管两端经受瞬间的高能量冲击时，它能以极高的速度（最高达1*10-12秒）使其阻抗骤然降低，同时吸收一个大电流，将其两端间的电压箝位在一个预定的数值上，从而确保后面的电路元件免受瞬态高能量的冲击而损坏。在汽车中的典型应用原理图如下：

TVS保护应用

图一：TVS保护应用

在汽车电路接口方面的设计中，也会选择众多的TVS进行保护。比如在USB的电源线，数据线用1颗TVS对地做防护，钳位静电电压。TVS的优势非常明显，它的结电容低至0.35pF，在USB2.0最高速率480Mbps时都可以完整传输信号，封装为DO-214AA SMB，紧凑体积小，能节约PCB空间，便于设计。

在汽车总线的应用中，例如常见的CAN总线，LIN总线，也需要增加TVS提高汽车电子保护等级。

CAN总线保护

图二：CAN总线保护

LIN总线保护

图三：LIN总线保护

LittelFuse推出的汽车级TVS，符合汽车电子委员会的Q101汽车级分离式半导体疲劳测试标准（AEC-Q101认证）。综上所述，LittelFuse产品十分适合用在汽车电路的保护方面，获取更多产品信息可联系世强。

LittelFuse汽车级瞬态抑制二极管TVS

图四：LittelFuse汽车级瞬态抑制二极管TVS

LittelFuse汽车级瞬态抑制二极管阵列SPA

图五：LittelFuse汽车级瞬态抑制二极管阵列SPA

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