【选型】如何巧妙选择瞬态电压抑制二极管,改善CAN端口的BCI抗扰能力
瞬态电压抑制二极管(TVS)是一种抑制有害高压脉冲的小型器件,当它的两端经受瞬间的高压冲击时,能以亚纳秒的速度把其自身两端间的阻抗值由高阻抗变为低阻抗,以吸收一个瞬间大电流到大地,从而把它的两端电压箝制在一个预定的数值上,以保护后面的电路免受瞬态高压尖峰脉冲的冲击。
不同的TVS适用于不同电路,甚至不同的TVS适用于卖给不同客户的相同电路(原因是不同的客户对可靠性的要求不同),因此TVS的选型对电路设计者来说至关重要,本文通过一款汽车音响(客户为通用汽车)CAN电路设计案例来对此进行说明。
这款车载音响产品中CAN总线的接口电路如下,图1的左侧为接口,右侧为CAN网络芯片,用于和外部的产品进行CAN消息的处理和收发。图中红圈位置是NXP的双通道TVS,型号为NXP推出的PESD1CAN,它靠近接口放置以便高压脉冲能量能通过它自身就近快速的释放到产品主板的地;CAN通讯差分线上的两颗电容作用有两个,一是辅助TVS抑制外部进来的高压脉冲,二是抑制CAN芯片对外的辐射噪声。
图1 CAN电路图
当使用PESD1CAN的TVS时,上图的CAN电路,在进行大电流注入(BCI)测试时,CAN消息会有错误帧和通讯中断这两种情况出现,BCI测试停止时通讯自动恢复,测试失败。
这里有必要解释一下BCI测试方法,BCI的测法是把干扰电流通过耦合夹耦合到产品的线缆上(CAN线属于车载音响的线缆之一),因走线有阻抗,当沿着线缆进入产品内部时就形成了高压脉冲对形成干扰,通用的BCI法规如图2所示。
图2 通用汽车BCI法规
经过仔细分析后,笔者换上LITTELFUSE的瞬态电压抑制二极管(TVS)产品SM24CANB-02HTG重新进行测试,结果如预期那样,可以通过通用汽车BCI测试,CAN总线不再出现错误帧和通讯中断现象,也没有其它功能性能异常情况,测试顺利通过。为了避免个体差异现象,我们又拿了两台样机都换上SM24CANB-02HTG,也无一例外的通过了通用汽车BCI测试。
图3 SM24CANB-02HTG外形与内部电路图
为何会有这样的不同结果?我们来对比下两者的参数:
图4 TVS参数对比
通过对比我们发现,两种TVS的最大反向工作电压一样,差异点主要有三点:
(1) 峰值电流:PESD1CAN的峰值电流只有3A,而Littelfuse的这款SM24CANB-02HTG则高达10A,可以释放更大的噪声电流从而更好的稳定电压;
(2) ESD等级:SM24CANB-02HTG的ESD等级高达±30KV,远远高于PESD1CAN的±23KV,意味着SM24CANB-02HTG抑制噪声的能力更强,其抵抗BCI的能力也更强;
(3) 钳位电压:PESD1CAN的钳位电压是40V,而Littelfuse的这款TVS产品钳位电压是34V,在更低的电压就可以钳位。
通过以上三点对比可以很清楚的看到,Littelfuse的这款TVS产品SM24CANB-02HTG,在BCI抗扰方面具有更好的优势,是车载音响CAN线路BCI保护的首选器件。
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内含两个双向TVS管,泄露电流低至0.1uA,钳位电压极低。
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Littlfuse瞬态抑制二极管阵列可保护电子设备免受雷击和静电放电(ESD)等快速瞬态电压的破坏,为输入/输出接口和数字与模拟信号线提供理想的保护方案。
产品型号
|
品类
|
AEC-Q101 Qualified
|
Standoff Voltage (V)
|
ILeak (μA)
|
ESD Contact (kV)
|
ESD Air (kV)
|
Lightning Immunity (8x20μs) (A)
|
Clamp Voltage
|
CI/OTYP (pF)
|
Polarity
|
Channels
|
MIN VBR@IT (V)
|
Operating Temperature(℃)
|
Package
|
SC1006-01LTG
|
TVS Diode Arrays
|
No
|
6
|
0.5
|
±30
|
±30
|
5
|
8.3V@1A
|
25
|
Unidirectional
|
1
|
N/A
|
-40° to 125°C
|
SOD523
|
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描述- 本报告主要针对DO-214AA和DO-214AC封装的TVS STD产品进行第二片晶圆来源和额外EMC来源的认证。报告详细介绍了产品的物理、电气和可靠性测试结果,包括参数测试、可靠性测试和电学特性总结。测试结果显示,第二片晶圆来源和额外EMC来源均符合规格要求,并已通过认证,可用于生产。
型号- P4SMA16A,SMAJ6.0CA,1.5SMB39CA,SMAJ40CA,SMA6J78CA,1KSMB110A,SMBJ8.5CA,SMBJ51A,SMBJ45CA-SA-GT3,SMBJ75A,P6SMB56A,SMAJ60CA-N,SMBJ100CA-N,SMBJ8.0A-23-TR70,SMAJ48CA-23-TR70,SMBJ12CA-SA-GT3,SMAJ120A,SMAJ110CA,SMAJ51CA,SMBJ400A-37,P6SMB30A,SMBJ5.0A-012,P6SMB62CA,SMAJ250A,P4SMA,SMAJ350CA,P4SMA530CA,P4SMA8.2CA,SMAJ13CA-23-RG70,SMAJ64CA,1KSMB7.6A,P4SMA18A,SMA6J54CA,1KSMB8.2CA,SMA6J7.0A,SMAJ8.0A,P4SMA16CA,SMBJ8.5CA-KF,P6SMB100A,SMBJ48CA-23-TR70,SMBJ300A,SMBJ150CA,P4SMA91CA,SMAJ70A,SMBJ6.0CA-SA-GT3,SMAJ75CA,P6SMB400CA,SMA6J43CA,1KSMB9.1A,SMBJ15CA-KF,SMA6J40A,SMBJ16CA,SMA6J64A,SMBJ6.0CA-37,P4SMA27CA,P6SMB170CA,SMBJ120A-23-TR70,SMAJ10CA-23-TR70,SMBJ33A-T7,SMA6J45A,SMBJ7.5CA-23-TR70,P6SMB75A,P6SMB51A,1KSMB160CA,SMA6J5.0A,P6SMB75CA,SMBJ170CA,SMA6J22A,SMBJ16A-23-TR70,P6SMB9.1CA,SMAJ100A,1KSMB27A,1KSMB7.5A,P4SMA300A,SMAJ30A-N,P6SMB250A,SMAJ5.0A-23-TR70,SACB7.0,P4SMA160CA,1KSMB130A,P6SMB7.5CA,SMA6J43A,P4SMA82CA,SMAJ7.0CA-23-RG70,SMAJ18A-23-RG70,SMAJ150A-L,SMBJ400CA,SMBJ36A-GT3,P6SMB120A,SMA6J10CA,P6SMB51CA,SMBJ7.5CA-SA-GT3R,P4SMA18CA,P6SMB6.8A,P4SMA540A,P6SMB300CA,SMAJ90A,SMBJ14CA,SMBJ70A,SMA6J45CA,P6SMB8.2A,SMA6J20A,SMAJ7.0CA,SMBJ48A-23-RG70,SMAJ8.5A,1KSMB30CA,P4SMA550CA,P4SMA56A,P6SMB,SMBJ33CA-MN,P6SMB540CA,SMA6J36CA,SMAJ18CA-23-TR70,P6SMB16A,P6SMB300A,1KSMB22A,SMBJ130CA,1KSMB62CA-N,1.5SMB39A,1KSMB43CA,SMAJ18CA,SMBJ45CA-SA-GT3R,P4SMA33A,SMAJ28A-23-TR70,SMBJ36CA,P4SMA170A,SMBJ5.0A-23-TR70,P6SMB39A,P6SMB15A,SMAJ250CA,1KSMB150A,P6SMA440CA-L,1KSMB47A,SMBJ7.5CA-GT3,SMBJ15CA-ER,P4SMA10A,P6SMB27CA,SMAJ60CA,SMA6J7.5CA,SMA6J58CA,P6SMB91CA,SMA6J12CA,P6SMB200CA,P4SMA12CA,P4SMA480CA,1KSMB24A,P6SMB16CA,P4SMA11A,SMBJ14CA-23-TR70,SMBJ90A,SMBJ12CA,SMBJ58CA,P6SMB13A,SMBJ17CA-23-TR70,SMBJ36A-23-RG70,SMAJ130CA,SMBJ350CA,SMBJ100A-ER,SMBJ5.0A,P4SMA12A,P4SMA36A,P6SMB75A-N,SMA6J85A,P6SMB36A,SMAJ16CA,P6SMB12A,P4SMA36CA,SMAJ5.0CA,SMBJ11CA-54,P6SMA440A-IE,P4SMA13A,SMAJ14A-,P6SMB10A,1KSMB170A,P4SMA47CA,P6SMB11A,SMAJ150CA,1KSMB56CA,P4SMA250A-SF,1KSMB10CA,1KSMB43A,P6SMB100CA,SMAJ8.0CA-23-TR70,SMBJ45CA,P6SMB58A,1KSMB180CA,SMA6J8.5CA,SMBJ170A,SMA6J14CA,SMBJ10CA,P6SMB540A,1KSMB68A,SMBJ6.0CA-23-RG70,SMBJ58A-ER,1KSMB20A,P6SMB18CA,P4SMA15A,SMAJ300A,SMAJ36CA-LC,P4SMA39A,SMAJ150A-23-RG70,SMA6J60A,SMBJ250CA,P6SMB82CA,P6SMB33A,P6SMB400A-102,P4SMA20CA-54,SMAJ6.5CA-23-TR70,P6SMB440CA,1KSMB7.6CA,1KSMB6.8CA,SMAJ36CA-54T7,1KSMB18CA-DH,SMBJ5.0CA,P6SMB47CA,1.5SMB43A,SMBJ220CA,P4SMA480A,SMAJ200CA-54T7,SMAJ14A-23-TR70,P6SMB220CA,SMBJ48A-SA-GT3,SMAJ16A,1KSMB24CA,1KSMB62A,P4SMA130A,P6SMB36CA,SMBJ78CA,SMA6J18CA,1.5SMB20CA,SMAJ48CA,SMBJ43CA,SMBJ170A-SA-GT3R,SMBJ5.0CA-KF,SMAJ17A,SMBJ440CA-23-RG70,SMAJ7.5CA,SMAJ22A-23-TR70,SMAJ13CA-23-TR70,SMBJ45CA-23-TR70,P4SMA110CA,1KSMB110CA,SMBJ9.0A-23-TR70,SMBJ33CA-0028,SMBJ7.0A,SMAJ400A,SMA6J16CA,1.5SMB100CA,SMBJ54CA,SMAJ15CA,SMBJ18A,SMAJ14A,SMBJ150A,SMAJ90CA,SMAJ24A-N,P6SMB12CA,P6SMB58CA,1.5SMB20A,SMAJ300CA,SMAJ15A-54T7,P6SMB440A-101,P4SMA30CA,SMAJ26CA,SMBJ100CA,1.5SMB68A,SMA6J7.0CA,SMAJ15A,1KSMB13CA,1KSMB,SMA6J100A,P6SMB120CA,1.5SMB23A,SMBJ26A-23-TR70,MSMBJSAC5.0,1KSMB82A,1.5SMB33CA,SMBJ16A,SMBJ30CA,1.5SMB47A,SMAJ36A,SMAJ12A,P4SMA51A,P4SMA75A,1.5SMB22A,SMA6J90A,SMAJ8.5CA,SMBJ10A-23-TR70,SMAJ180A,P4SMA150A,SMBJ440CA,1.5SMB68CA,1.5SMB22CA,P4SMA43CA,SMBJ17A,SMAJ15CA-23-TR70,SMAJ13A,SMBJ120CA,SMBJ70CA-ER,SMAJ18A-23-TR70,SMBJ18CA-23-TR70,SMBJ14A,SMBJ5.0CA-23-TR70,P6SMB18A,SMAJ13CA,P4SMA10CA,SMAJ100CA-23-TR70,P4SMA56CA,SMAJ7.0A-23-TR70,SMAJ15A-23-TR70,SMBJ28CA-ER,SMAJ58A,SMBJ130A,SMAJ10A,SMA6J60CA,1KSMB15CA,SMBJ7.5A,SMBJ7.0CA-23-TR70,SMA6J8.0CA,SMBJ15A,SMAJ24CA,SMAJ400CA,SMAJ170CA,1.5SMB24A,P6SMB440CA-L,SMAJ11A,P4SMA30A,P4SMA440A,SMA6J120A,SMA6J51CA,SMBJ9.0A,SMBJ6.0A-54,SMA6J6.0CA,SMBJ58CA-37,SMBJ12A,SMBJ16CA-23-RG70,SMAJ200CA,SMAJ8.5CA-23-TR70,SMBJ36A,P6SMB150A,SMBJ24CA-23-TR70,SMAJ6.0A,SMAJ33CA,SMBJ6.0CA-SA-GT3R,SMBJ350A,1.5SMB82A,SMBJ6.5CA,P4SMA550A,SMA6J26A,SMA6J40CA,1KSMB39CA,P6SMB82A,1.5SMB24CA,SMAJ160A,SMBJ13A,SMBJ85CA,SACB5.0,P6SMB43CA,1KSMB150CA,SMAJ33CA-54T7,SMAJ33A,P4SMA220A,SMBJ6.0A-23-TR70,SMAJ40CA-23-TR70,SMBJ58A,SMBJ22CA-23-TR70,SMAJ85A-L,SMAJ11CA,SMBJ110A,P6SMB30CA,SMBJ220A-L,SMBJ75CA-23-TR70,SMAJ78A,SMBJ300CA,SMAJ54A,SMAJ30A,SMA6J24A,SMBJ5.0A-54,SMA6J48A,SMBJ11CA-SA-GT3R,SMBJ10A,SMBJ36A-23-TR70,SMA6J8.5A,P6SMB8V2CA,SMAJ440CA,SMBJ11A,P6SMB480CA,SMAJ36CA-23-TR70,HTVSB7.0CA-100,SMAJ22CA,SMBJ220A,SMAJ75A,SMBJ51CA-23-TR70,SMAJ51A,SMBJ33A-014,SMAJ100CA,P4SMA510CA,P4SMA9.1A,SMBJ7.5CA,SMA6J5.0CA,P4SMA91A,P6SMB10CA,P6SMB170A,SMBJ12CA-N,P4SMA110A,1.5SMB62A,SMAJ188A,SMA6J6.5A,SMBJ33A,SMAJ6.5A,SMBJ440A,SMA6J75CA,SMAJ20CA,SMAJ6.0CA-23-TR70,SMAJ6.5CA,SMBJ200CA,SMBJ78A,P4SMA7.5A,SMAJ28A-37,P4SMA350A,SMAJ150A-23-TR70,P6SMB56CA,SMA6J64CA,SMA6J28A,SMBJ30A,SMBJ54A,P4SMA6.8CA,SMA6J8.0A,P4SMA180CA,1KSMB130CA,SMBJ200A,SMBJ5.0CA-MD,P6SMB15CA-HW,P6SMB400A-SCH,SMBJ,P4SMA400A,1KSMB18A,P4SMA9.1CA,P6SMB160CA,P6SMB43A,P4SMA15CA,P6SMB68A,SMBJ20CA-SA-GT3,SMBJ70CA,SMBJ170A-SA-GT3,P6SMB110A,P4SMA170CA,SMBJ24A-37,1KSMB9.1CA,SMBJ6.5A-37,P4SMA7.5CA,SMAJ7.5A,1KSMB62CA,SMA6J54A,SMAJ350A,SMA6J78A,SMBJ13A-C,SMAJ60A,SMAJ,P4SMA510A,SMAJ12CA-23-TR70,SMBJ17CA,SMBJ40A,P
LITTELFUSE Automotive Qualified TVS Diode Arrays选型表
Littlfuse瞬态抑制二极管阵列可保护电子设备免受雷击和静电放电(ESD)等快速瞬态电压的破坏,为输入/输出接口和数字与模拟信号线提供理想的保护方案。
产品型号
|
品类
|
AEC-Q101 Qualified
|
Standoff Voltage (V)
|
ILeak (μA)
|
ESD Contact (kV)
|
ESD Air (kV)
|
Lightning Immunity (8x20μs) (A)
|
Clamp Voltage
|
CI/OTYP (pF)
|
Polarity
|
Channels
|
MIN VBR@IT (V)
|
Package
|
AQ1003-01ETG
|
TVS Diode Arrays
|
AEC-Q101
|
5
|
0.1
|
±30
|
±30
|
7
|
11.4V@6A/12V@7A
|
30
|
Unidirectional
|
1
|
6
|
SOD882
|
选型表 - LITTELFUSE 立即选型
【应用】超低电容TVS阵列实现CVBS端口的静电和浪涌保护
SLVU2.8HTG具有2pF的负载电容,超过了IEC61000-4-2ESD标准的ESD最高保护水平。
3通道TVS阵列SP0503BAHTG用于USB防护时,该如何使用?
3通道TVS阵列SP0503BAHTG用于USB防护时,其公共端接USB的电源地GND,另外3端分别接USB的电源VCC、数据线USB D+和USB D-。
【产品】SMTOAK2系列表面贴装瞬态电压抑制二极管,采用SMTO-263封装,额定电流为2kA
SMTOAK2系列表面贴装瞬态电压抑制二极管用于保护敏感的电子设备免受过压浪涌和电感反冲(电感式负载开关电压瞬变)事件的影响。该系列TVS二极管提供高功率密度保护,额定电流为2kA(8/20μs脉冲)。
放大器输入信号的过压保护应用中需要一款3.3V的TVS管,请问有无合适型号推荐?
推荐使用SMAJ系列的型号SMAJ5.0A。
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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>
可定制单色光灯珠、双色灯珠、全彩灯珠、发光二极管、贴片灯珠、贴片LED等产品,尺寸:0.6*0.3mm-3.2*2.7mm,波长:405-940nm,亮度:24-750mcd,电压:1.5-3.5V。
最小起订量: 3000 提交需求>
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