【应用】Littelfuse的femtoSMDC低阻值PTC助力TBOX外置4G天线过流保护

2021-03-31 世强
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车载TBOX外置天线出现脱落或短路时,远程通讯就会出现故障,导致发生紧急情况无法拨打E-CALL,给车主带来极大的不便,因此需要在4G天线的回路上增加限流保护。


一般4G天线端口会增加检测回路,如图1所示,通过电阻分压计算判断4G天线的工作状态。但一旦出现短路过流状态时,需要增加过流保护器件,保护后级电路器件不能因为过流而损坏,同时异常解除后TBOX要能再次正常工作。考虑4G天线信号正常工作电流为20mA左右,避免保护器件对4G信号的影响,选取低阻值的PTC是4G天线过流保护的最佳选择。

图1 TBOX 4G天线端口检测回路电路示意图


针对上述需求,LITTELFUSE推出了低阻值的femtoSMDC系列PTC,其应用优势如下:

1、低阻抗,考虑20mA的工作电流标准和高温IH电流的降额,推荐IH为50mA的femtoSMDC005F,25℃下最小电阻仅3.8Ω,保证4G信号质量不会因为PTC的常温阻值过大而变弱;

2、动作时间快,0.5A电流的动作时间为0.1S,保证4G天线在遇到异常时,PTC能迅速保护,大大降低后级器件因过流而损坏的几率;

3、0603小体积封装,更适合TBOX产品小体积布局,节省PCB空间和成本;

4、湿敏等级高,满足J-STD-020的MSL1标准,大大提高了TBOX产品上4G天线在恶劣环境运行时的可靠性。


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目录- 特性和术语    应用和电路保护典型设计    选择工作表    表面贴装型    径向引线型    轴向引线型   

型号- 30R135UU,72R300XF,1210L075/24PR,30R090UU,600R160-R1UR,1206L025YR,1812L,1812L350SL,1812L010/60DR,0603L050SLYR,2016L075/60,600R160-RAF,72R160XMR,0603L010YR,60R185XMR,1210L150TH,0805L110SLYR,16R1100G,1210L450SLWR,0402L050SLKR,0603L150SL,30R160UPR,1812L020PR,1206L110/12SL,2920L300DR,1206L175SLYR,72R090X,16R400GPR,16VT210SU,0805L260SLTH,1210L175WR,1812L200/12,LORHO,250S130¨CRCDR,30R300U,1812L200/16,16R1000GF,0805L100,16R250GU,20LR450,250R145-RA,2016L075/60MR,30R090,250R145-RAU,0402L020SL,2920L500/16,1206L260SLTHYR,1812L110/33MR,250S130¨CRC,250S130¨CRB,250S130¨CRA,16R135B,60R110XU,250S130V,2920L330/24MR,0603L075SL,0805L110,1206L175PR,250R145-RB,0603L,1206L012WR,16R500GU,24LT100,1812L150/12DR,1812L200/16DR,16R185BU,1210L380SL,600R160-RAUR,250S130¨CRBDR,30R800UH,15ST175U,250R145ZR,600R160F,16R1000G,16R110BPR,1206L380SLTHYR,16R250GPR,250R120-R3U,600R150-RA,600R150-RB,60R250,60R010,1812L075/33,250R120-R3,250R120-R2,250R120-R1,1210L200,1812L260/16MR,30R250UPR,72R135XMR,16R600GDR,1210L400SL,1206L300SLTHYR,30R700UMR,1206L450SL,250R120-RF,1206L200SLYR,250R120-RC,250R120-RA,0603L035YR,250R120-R2U,0603L175SL,1210L300SLYR,16R800GMR,60R375XH,16R110B,1812L190SLPR,16R1100GF,250R120TU,0805L075SLYR,16R1200G,250R120-RFZR,0402L,2920L200DR,2920L300,600R150F,2920L700SL,250R120-R1U,30R700UF,1210L075YR,2920L700SLPR,1210L110/16WR,60R110,1210L175SLYR,0805L010/24,16R600GU,2920L075/60MR,30R400U,60R050X,72R,60R,0402L010SLKR,72R090XPR,1206L050/15,1206L150SLYR,72R185XMR,2920L260PR,72R250XMR,1206L450SLWR,60R010XU,16VT210S,30R185,1812L075/24,1206L110SL,16R700GKLMR,1206L110TH,60R075X,LT SERIES,0603L100SLYR,1812L370SLPR,16R160BU,0805L110SL,60R025XPR,60R160X,0805L200SLTHYR,30R090UPR,2920L260/24,15LR380U,2920L,2920L185DR,16R500GPR,250R120T,60R090XPR,250R120U,30R300UU,1812L270SLPR,60R300X,1812L300SLPR,30R600U,72R075XU,0603L075SLYR,15LR260U,2016L,0402L020SLKR,06R075BU,06SL370GM,1206L075/16WR,1812L260SL,60R020XPR,20LR730,250R180MR,2920L330/24,06R155BPR,06SL190G,72R040XU,16R400G,1210L110THYR,2920L030DR,1812L160PR,2920L260/24DR,1812L075/33DR,1812L260TH,1210L035YR,1812L270SL,16R135BPR,1206L020YR,1206L075/13.2,30R250,0805L200SLTH,1812L050PR,600R150-RBF,0402L035SLKR,30R600UF,1210L350SL,16R300G,1206L075/13.6,72R075XPR,15LR260,15LR380,16R300GPR,30R185UPR,16R700GF,1812L014DR,60R160XMR,250R145U,0805L,1206L075SL,30R090U,2920L150DR,0805L050WR,1206L150TH,1812L200/12DR,0402L035SL,600R150-RAF,250R145T,1206L150SL,72R300XMR,1206L400SLWR,72R160XF,1812L150/24MR,30R500U,72R030XPR,2920L075DR,1206L075TH,1210L010WR,1812L350SLPR,LR,LT,1812L160/12DR,1812L150/24,60R025XU,2920L400/15MR,16R700GMR,0805L150SLYR,72R050XU,30R,16R1100GMR,60R010XPR,60R090,2920L200/24,1206L035YR,250R145-RBU,1206L050/15YR,16R800GF,1812L150/12,2920L400/15,VT 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测试报告  -  LITTELFUSE  - 2023/9/15 PDF 英文 下载

【选型】Littelfuse(力特)保险丝座选型指南

目录- Fuse Characteristics, Terms and Consideration Factors    Fuse Selection Checklist    PTC Characteristics and Terms    PTC Product Applications    Typical PTC Circuit Protection Designs    Fuse Standards    Fuse and PTC Products Selection Guide    Fuse Packaging and Part Numbering   

型号- 1812L,471,230,472,473,232,233,234,235,477,874,875,876,239,877,2016L,461E,485,LORHO,400,157T,369,804,807,808,600R,437 SERIES,USBR,370,251,372,373,494,253,374,2205,SL,0603L,0805L,ST,382,262,383,263,385,265,266,267,268,269,303,429,1210L,LR,LT,391,1206L,392,272,273,274,395,154,275,396,397,398,157,278,399,219XA,279,312,950,313,30R,159,314,435,315,437,438,318,LORHO PTC,160,285,440,250S,441,250R,322,443,202,203,324,VL,325,446,326,447,448,449,208,209,VT,16R,451,452,332,453,154T,454,213,456,215,72R,216,458,60R,217,459,218,977,460,461,220,462,464,465,224,466,225,467,468,501,469,229,505,506,2920L,508

选型指南  -  LITTELFUSE PDF 英文 下载

PTC 参数怎么确定了,比如直流5v10A电流,选多大合适?

PTC选型需要清楚最大工作电压、保持电流Ihold、动作电流Is(又称保护门限电流)等,当高于这个电流值时,将出现阻抗陡然增加现象。可参考如下图示阻抗Z-电流I曲线关系。故,如果以5V/10A电流为例,选择的PTC工作电压需要大于5V,如果10A是正常工作电流,假定以2倍过流,这个需要清楚回路中最大的过电流为多少。选择PTC值时,保证动作电流Is一定要小于回路的最大过电流,以2倍过流预估为20A过流的话,即Is<20A,保持电流Ihold选择等于10A或略小于10A均可。满足这样需求的PTC Littelfuse(力特)有很多,还需要知道封装(贴片式、插件式)、尺寸、工业级还是汽车级等信息。

技术问答    发布时间 : 2018-10-29

数据手册  -  LITTELFUSE  - REV LETTER: D  - JULY 26, 2016 PDF 英文 下载 查看更多版本

想选择一款贴片式(SMD)自恢复保险丝(PTC),要求保持电流0.2A,跳闸电流0.4A,最大容忍电压30Vdc,最大容忍电流10A,请问是否有合适型号推荐?

推荐1210L020WR自恢复保险丝,尺寸为0.12 inch x 0.10 inch(3mm x 0.1 mm),保持电流0.2A,跳闸电流0.4A,最大容忍电压30Vdc,最大容忍电流10A,可满足设计需求。

技术问答    发布时间 : 2017-10-10

数据手册  -  LITTELFUSE  - REV LETTER: C  - July 26, 2016 PDF 英文 下载 查看更多版本

【技术】自恢复型PTC帮助降低USB-C的风险

USB-C电路失效时,如何建立安全且可靠的保护机制,减少因为过热而造成使用者受伤或装置损坏。

技术探讨    发布时间 : 2017-04-09

数据手册  -  LITTELFUSE  - REV LETTER: G  - JULY 26, 2016 PDF 英文 下载 查看更多版本

自恢复保险丝(PTC)的ITRIP电流的意义是什么?

Itrip可以叫做跳变电流,就是指电流超过该值时,电阻会出现大幅增加。其作为自恢复保险丝特有的重要参数,在设计选型时要格外重视。

技术问答    发布时间 : 2017-10-10

SMD Series Automotive High Temperature Surface Mount PTC Datasheet

型号- PICOASMDCH016F-2,MINIASMDCH050F,PICOASMDCH020F-2,RF4927-000,RF4778-000,RF4897-000,RF5023-000,RF4646-000,RF4896-000,PICOASMDCH050F,PICOASMDCH010F,PICOASMDCH020F,PICOASMDCH016F,NANOASMDCH035F,RF4929-000,RF4983-000,NANOASMDCH050F/24,SMD,RF5025-000,NANOASMDCH035F/30,SMD SERIES,RF4914-000,PICOASMDCH005F,NANOASMDCH016F,PICOASMDCH035F,RF5024-000

数据手册  -  LITTELFUSE  - 06/03/21 PDF 英文 下载

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温度传感器定制

可定制温度范围-230℃~1150℃、精度可达±0.1°C;支持NTC传感器、PTC传感器、数字式温度传感器、热电堆温度传感器的额定量程和输出/外形尺寸/工作温度范围等参数定制。

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车规级电感定制

可定制车规级电感的电流范围0.3~17.9A,尺寸最小1x0.55x0.5mm到最大12.5x12.5x6mm,工作频率100KHz~2MHz,感值范围:0.47uH~4.7mH。符合IATF16949和AECQ-200。SPQ为5K。

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