【成功案例】基于汽车级TVS二极管TP6KE的汽车CAN总线的反击穿保护系统设计
在汽车电子控制系统中，所有的车载数据均通过CAN总线与ECU进行交互。因此对CAN总线进行保护是在设计CAN通讯系统的重中之重，其中最为重要的就是反击穿保护。笔者从器件选型、电路设计、系统测试三方面谈一谈使用心得。
器件选型
笔者在方案设计时，就CAN总线模块的TVS二极管提出了如下的硬件设计要求：
• 因为商用车中的汽车电源大部分为12V，所以要求TVS二极管具有12V-14V的反击穿电压
• 为了确保低功耗的需求，要求TVS二极管的漏电流在10uA以下
• 符合汽车级标准
• 因为汽车电路板尺寸较小，所以需要TVS二极管的封装尺寸较小，易于焊接
综合选型需求，笔者使用使用LITTELFUSE公司的TP6KE型号TVS二极管做反击穿保护具有如下特点：
• 峰值功率600W，可以防止功率击穿
• 截止电压最大为15.8V，满足防击穿电压需求。
• 工作温度-55～+170℃，满足汽车级需求
• 漏电流为1uA，具有极低的功率消耗。
• 电感值较小
• EIA STD RS-296小封装，可以减少二极管占板面积
• 高可靠性，满足AEC Q101汽车标准
电路设计
由于CAN总线是双线结构，所以很有可能在两条线上产生浪涌并导致CAN收发器故障，所以需要进行保护电路设计。基本思路是利用电容做滤波处理，配合TPS二极管防止双向击穿。图1是笔者在设计中的实际应用保护电路。
图1 基于TP6KE二极管的CAN通信硬件电路
TP6KE可以保护共模的两条CAN总线不受浪涌影响，同时可以保护CAN总线而不削减CAN信号，当瞬时电压超过电路正常工作电压后，TP6KE便发生雪崩，提供给瞬时电流一个超低电阻通路，瞬时电流通过二极管被引入GND，可以避开CAN通讯芯片，并且在电压恢复正常值之前使被保护回路一直保持12.8V的截止电压。当瞬时脉冲结束以后，TVS二极管自动回复高阻状态，整个回路进入正常电压。
笔者在设计之初，电容选用20pf，但存在部分谐波会影响电路的稳定性。经过多次尝试，为大家推荐27pf作为参考值。
TP6KE的汽车级ISO16750-2浪涌测试：
浪涌测试是二极管保护性能的重要测试内容。在一定时间内连续产生多个浪涌脉冲，利用示波器查看二极管的电压特性变化，此测试可以表征二极管的防击穿特性。
根据汽车级ISO16750-2测试要求，使用模拟负载产生瞬态突变，在10分钟内连续产生10个浪涌脉冲，进行甩负荷5a脉冲测试验证。测试结果如图2所示：
图2 ISO16750-2测试条件下的波形图
图2是浪涌测试实际测试图，在线路存在浪涌脉冲时，TP6KE可以在296ms内抑制浪涌脉冲，使电路回恢复到正常工作状态，瞬时抑制浪涌能力极强。
总结
汽车CAN通信模块是非常重要的组成部分，它是汽车通信系统的核心组件。因此对其进行充分的保护是及其重要的，本文推荐使用的TP6KE满足汽车级的使用要求，抑制瞬时浪涌速度快，漏电流极小，可以充分满足设计需求。
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目录- Company profile Circuit Protection Technologies Overcurrent/Overvoltage Protection device ESD Suppression Solutions Overcurrent Protection/Overvoltage Protection Applications Common Circuit Threatsand Protection Solutions Fuses Fuse Holders PPTC Devices Varistors Gas Discharge Tubes ESD Suppressors TVS Diode Arrays Protection Ics TVS Diodes PLED Bypass Protectors SIDACtor® Protection Thyristors Circuit Breakers
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型号- SZ5KASMC18CAT3G,SZ5KASMC,SZ5KASMC28AT3G,SZ5KASMC18AT3G,SZ5KASMC13CAT3G,SZ5KASMC17CAT3G,SZ5KASMC10AT3G,SZ5KASMC45AT3G,SZ5KASMC36CAT3G,SZ5KASMC36AT3G,SZ5KASMC17AT3G,SZ5KASMC SERIES,SZ5KASMC33AT3G,SZ5KASMC20AT3G,SZ5KASMC8.5AT3G,SZ5KASMC16AT3G,SZ5KASMC26CAT3G,SZ5KASMC12CAT3G,SZ5KASMC20CAT3G,SZ5KASMC7.0AT3G,SZ5KASMC15CAT3G,SZ5KASMC5.0AT3G,SZ5KASMC14AT3G,SZ5KASMCXXCAT3G,SZ5KASMC15AT3G,SZ5KASMC7.5AT3G,SZ5KASMC24CAT3G,SZ5KASMC22AT3G,SZ5KASMC8.0AT3G,SZ5KASMC10CAT3G,SZ5KASMC24AT3G,SZ5KASMC48AT3G,SZ5KASMC16CAT3G,SZ5KASMC6.5AT3G,SZ5KASMC40AT3G,SZ5KASMC28CAT3G,SZ5KASMCXXAT3G,SZ5KASMC12AT3G,SZ5KASMC22CAT3G,SZ5KASMC33CAT3G,SZ5KASMC6.0AT3G,SZ5KASMC30CAT3G,SZ5KASMC14CAT3G,SZ5KASMC11AT3G,SZ5KASMC26AT3G,SZ5KASMC11CAT3G,SZ5KASMC9.0AT3G,SZ5KASMC43AT3G,SZ5KASMC13AT3G,SZ5KASMC30AT3G
Littelfuse力特TVS二极管/TVS二极管阵列，提供kA级高电流保护
Littelfuse力特TVS二极管增量浪涌电阻较低，提供单双向极性，反向断态电压和峰值额定功率范围宽，提供高电流保护。Littelfuse力特TVS二极管阵列提供广泛的工业标准分离或多通道贴片包装，这些特性组合起来，使其寄生电容减小到0.4pF，而ESD性能高达±30kV。世强是Littelfuse力特代理商，可供应Littelfuse力特TVS二极管/TVS阵列，价格优惠，库存丰富。
原厂动态 发布时间 : 2018-10-01
Littelfuse的TVS二极管5.0SMDJ90CA峰值功率测试条件10/1000us是代表什么意思？
Littelfuse的TVS二极管5.0SMDJ90CA峰值功率测试条件10/1000us是代表测试波形上升时间10us,从峰值下降时间为1000us。
技术问答 发布时间 : 2019-05-21
Littelfuse（力特） SLD TVS二极管数据手册
型号- SLD16U-017,SLD18-018,SLD43-018,SLD26-018,SLD,SLD33U-017,SLDXXU-017X,SLD17-018,SLD17U-017,SLD24U-017,SLD40U-017,SLD51-018,SLD10U-017,SLDXXXXX,SLD60-018,SLD16-018,SLD33-018,SLD43U-017,SLD51U-017,SLD54U-017,SLD20-018,SLD14U-017,SLD11U-017,SLD58-018,SLD28-018,SLD15-018,SLD14-018,SLDXXXX-B,SLD45-018,SLD30-018,SLD13-018,SLD36U-017,SLD22-018,SLD22U-017,SLD48-018,SLD30U-017,SLD12-018,SLD60U-017,SLD28U-017,SLD13U-017,SLD58U-017,SLD24-018,SLD11-018,SLD12U-017,SLD20U-017,SLD54-018,SLD48U-017,SLD40-018,SLD18U-017,SLD15U-017,SLD45U-017,SLD10-018,SLD36-018,SLD26U-017
TVS Diode Selected Parts Obsolescence
型号- BZY93C56R,BZY93C20N,BZY93C68R,BZY93C20R,BZY91C15R,BZY91C39R,BZY91C8V2-C75,BZY91C27R,BZY91C15N,BZY93C56N,BZY93C68N,1N5639A,1N6040A,BZY91,1N6064A,BZY93,1N6052A,BZY93C33R,BZY93C33N,BZY91C39N,1N5638A,BZY91C27N,1N6051A,BZY91C9V1N,1N6063A,BZY91C9V1R,BZY93C10R,BZY93C22R,1N5660A,BZY91C13R,BZY93C10N,BZY91C13N,BZY93C22N,1N6066A,1N6054A,1N5629A,1N6042A,1N5629-65A,1N6037,BZY93C9V1R,1N6036,1N6039,1N6038,BZY93C9V1N,BZY93C11R,1N5629,BZY91C24R,BZY93C47N,BZY91C12R,BZY91C36R,BZY91C24N,BZY93C47R,BZY93C11N,BZY91C12N,BZY91C36N,1N6065A,1N6040,1N6042,1N6041,1N6044,1N6053A,BZY91C8V2N,1N6041A,1N6043,1N6046,1N6045,1N5630,1N6048,BZY91C8V2R,1N6047,1N5632,1N5631,1N6049,1N5634,1N5633,1N5636,1N5635,BZY93C12R,1N5638,1N5637,BZY93C24R,1N5639,BZY91C11R,1N5650A,BZY93C36N,1N5662A,BZY91C11N,BZY91C47R,BZY93C36R,BZY93C12N,BZY93C24N,BZY91C47N,1N6044A,1N6051,1N6068A,1N6050,1N6056A,1N6053,1N6052,1N6055,1N6054,1N6057,1N6056,1N5641,1N6059,1N5640,1N6058,1N5643,1N5642,1N5645,1N5644,1N5647,1N5646,1N5649,BZY93C13R,1N5648,BZY91C22R,BZY91C10R,1N5661A,BZY91C22N,BZY91C10N,BZY93C13N,1N6055A,1N6060,1N6043A,1N6062,1N6061,1N6067A,1N6064,1N6063,1N6066,1N6065,1N5650,1N6068,1N6067,1N5652,1N5651,1N6069,BZY93C8V2-C75,1N5654,1N5653,1N5656,1N5655,1N5658,1N5657,1N5659,BZY91C33R,1N5640A,1N5652A,BZY91C33N,1N5664A,1N6071,1N6070,1N6046A,1N6072,1N5661,1N5660,1N5663,1N5662,1N5665,1N6058A,1N5664,BZY91C20R,BZY91C20N,1N5651A,BZY93C15N,BZY91C56R,BZY91C68R,1N5663A,BZY93C27N,BZY93C39N,BZY93C15R,BZY91C56N,BZY91C68N,BZY93C27R,BZY93C39R,1N6057A,1N6045A,1N6069A,BZY91C43R,1N5630A,BZY93C16N,1N5642A,BZY91C43N,1N5654A,BZY93C16R,1N6048A,1N6036A,BZY91C30R,BZY91C30N,1N5641A,1N5653A,1N5665A,BZY93C18N,1N6059A,1N6047A,BZY93C62N,BZY93C62R,BZY93C18R,1N5632A,1N6070A,1N5644A,1N5656A,1N6038A,BZY93C51N,BZY93C51R,BZY93C75R,1N5631A,1N5643A,1N5655A,BZY91C20R-007,1N6036-72A,1N6037A,1N6049A,BZY91C51R,BZY91C75R,BZY91C51N,1N56,BZY91C75N,1N6060A,1N5634A,1N5646A,1N5658A,1N5659A,BZY93C120R,1N6072A,BZY93C8V2R,BZY93C34.5C-004,BZY93C8V2N,1N60,BZY91C62R,BZY91C62N,1N6071A,1N5633A,1N5645A,1N5657A,BZY91C18R,1N6039A,BZY93C30N,BZY93C30R,1N5636A,1N5637A,1N5649A,BZY91C18N,1N6062A,1N6050A,BZY93C43R,1N5642A-B,BZY93C43N,BZY91C16R,1N5635A,1N5647A,1N5648A,1N6061A
【产品】符合AEC-Q101汽车级TVS二极管TPSMB系列，为汽车电子保驾护航
Littelfuse针对敏感的汽车电子元件在负载突降和其它瞬态电压事件引发瞬态电压推出了TPSMB系列TVS二极管。该系列紧凑的DO-214AA封装和600W额定功率使其成为高可靠性、汽车和便携式设备应用出色的次级保护解决方案
新产品 发布时间 : 2016-12-16
SZSMF4L 400 W Surface Mount TVS Diode Series Automotive Grade in Small SOD-123FL Package
型号- SZSMF4L,SMF4L-T1G SERIES,SMF4L-T1G
1.5KE Series TVS Diodes
型号- 1.5KE350CA,1.5KE13CA,1.5KE36CA,1.5KE9.1A,1.5KE7.5CA,1.5KE120CA,1.5KE160A,1.5KE51CA,1.5KE30A,1.5KE540A,1.5KE120A,1.5KE350A,1.5KE82A,1.5KE170CA,1.5KE440CA,1.5KE13A,1.5KE24CA,1.5KE47CA,1.5KE9.1CA,1.5KE300CA,1.5KE550CA,1.5KE6.8CA,1.5KE20CA,1.5KE43CA,1.5KE62CA,1.5KE16A,1.5KE56A,1.5KE600A,1.5KE68A,1.5KE12CA,1.5KE16CA,1.5KE39CA,1.5KEXXXXX,1.5KE300A,1.5KE110A,1.5KE20A,1.5KE530A,1.5KEXXXXX-B,1.5KE SERIES,1.5KE150A,1.5KE27A,1.5KE15A,1.5KE39A,1.5KE110CA,1.5KE27CA,1.5KE530CA,1.5KE43A,1.5KE220A,1.5KE220CA,1.5KE160CA,1.5KE18A,1.5KE22A,1.5KE400A,1.5KE11CA,1.5KE15CA,1.5KE510CA,1.5KE540CA,1.5KE180A,1.5KE30CA,1.5KE91CA,1.5KE480CA,1.5KE62A,1.5KE100A,1.5KE10A,1.5KE250CA,1.5KE33A,1.5KE510A,1.5KE22CA,1.5KE68CA,1.5KE130CA,1.5KE440A,1.5KE250A,1.5KE480A,1.5KE200CA,1.5KE180CA,1.5KE12A,1.5KE36A,1.5KE24A,1.5KE33CA,1.5KE6.8A,1.5KE56CA,1.5KE8.2A,1.5KE100CA,1.5KE7.5A,1.5KE18CA,1.5KE170A,1.5KE75CA,1.5KE10CA,1.5KE550A,1.5KE320A,1.5KE130A,1.5KE400CA,1.5KE8.2CA,1.5KE11A,1.5KE47A,1.5KE150CA,1.5KE320CA,1.5KE82CA,1.5KE600CA,1.5KE200A,1.5KE51A,1.5KE75A,1.5KE91A
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整体外形尺寸小至0.6*0.3*0.3mm (DFN0603)，工作电压范围覆盖2.5V~36V，电容值低至0.2pF，浪涌能力最高可达240安培，静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
提交需求>
可定制LAMP LED、 CHIP LED、 PLCC LED、 汽车用车规级LED、COB LED的尺寸/电压/电流等参数，电压1.5-37V，电流5-150mA，波长470-940nm。
最小起订量： 30000 提交需求>
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