【应用】Littelfuse PTC 1812L200TH助力K吧一体机的USB接口电源限流

时间： 2020-10-19 来源：世强

技术问答

目前一些综合体、商超配备了K吧一体机，K吧一体机占地面积小，隔音效果优秀，适合碎片时间的放松。为了提供更好的服务体验，一体机会提供两个对外的标准USB接口，用户可以用它们给智能手机充电，也可以接U盘，将刚才唱的歌曲MV和录音合成一个新的视频文件进行存储。因为是开放式场所，很多类型的USB外设都有可能接入到USB接口，有些外设需求电流还很大，超出了USB接口的额定电流；或者会有一些玩具或者金属片堵住了USB接口，轻则导致接口不能使用，重则会导致USB电源短路，同时影响到系统的正常运行。为了解决这个问题，有必要对USB接口的电源做一些限流处理，保证即使USB接口电源短路了，系统也还能正常运行。

USB电源的限流措施，可以使用专用的电源开关芯片，也可以使用PTC产品。本项目考虑成本、控制难易程度、通用性等因素，选择了使用PTC方案。根据产品的使用环境，笔者采用了LITTELFUSE的PTC产品1812L200TH，该品牌在业内和笔者公司的口碑都较好，物料的价格和交期都能达到要求，就将其导入了具体的产品设计中，具体如下图1。

图1. USB接口的PTC应用电路图

图中标准的USB2.0接口的电源电压是+5V，两个USB接口的总驱动力为1.5A，使用Littelfuse的PTC产品1812L200TH能够保护当USB外设过流或者短路时，及时降低电流，保护产品的正常运行。

1812L200TH的保持电流为2A，最大电压值为8V，使用在USB接口的5V电压和1.5A驱动力电路上，满足了降额设计要求；同时该PTC在20℃时的最大电阻值为0.07Ω，低电阻值降低了PTC的本体压降，对接口电源的影响也就非常小，保证了接口的正常电气性能。

该PTC的工作温度范围为-40℃~+85℃，PTC的保持电流会随着温度的升高而下降，在-40℃时候的保持电流值为2.6A，而在+85℃时候的保持电流值为1.29A；在电路参数选型的时候，要注意产品的使用环境温度范围。在PCB布局的时候要考虑到PTC容易受到周边功率器件的温度影响，同时也要考虑到PTC在产生动作时（负载过流或者短路），本体也会产生较大的热量，可能会对周边的热敏感器件产生影响，需要做必要的避让处理。本产品将PTC放置在了接口端附近，靠近PCB板边缘，远离CPU和电源芯片等发热器件，同时PTC周边只放了少量阻容和插座类物料，在空间允许的条件下尽量将避让区域做得大一些。

Littelfuse的1812L系列PTC有多款产品型号可选择，采用贴片1812封装，比起市面上常规的插件封装，减少了对空间的占用，也提高了生产效率。如下图2是我们的一个产品实物图。

图2. PTC产品实物图

K吧一体机产品的USB接口电源通过串接Littelfuse的PTC 1812L200TH，低电阻值降低了对接口电源的电气影响，当负载设备出现过流或者短路时，该PTC能快速响应提升电阻值，保证不会对系统产生大的影响；同时当负载设备的过流或者短路解除时，该PTC会自动恢复到低阻值，保证产品能正常运行。

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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 SERIES,30R700U,1210L175SL,250R145TZR,0603L020YR,250S130¨CRADR,30R400UF,0805L300SL,1812L020/60,2016L050,1210L260SL,2016L050MR,16R250BU,1210L110/12WR,1812L010/60,06R120BPR,1812L075PR,30R400UMR,72R065XPR,60R135XF,SL SERIES,0805L010/24YR,16R250BPR,1812L370SL,30R160UU,20LR450U,0603L050SL,60R090X,1206L035/16,1210L020WR,1210L110/16,600R160-R1F,0402L010SL,250S130DR,60R185,24LT100U,72R020XPR,1206L150THWR,1210L380SLYR,1206L175SL,16R700GKL,72R300X,2920L050DR,2016L030,60R090XU,1210L110/12,2016L150,250R120ZR,16R185BPR,60R017XPR,1812L75/33,60R110XMR,1206L035/16YR,60R075XPR,60R025X,15ST175,250R180TMR,1812L150ZR,2920L050,1210L005WR,72R375X,1812L260THDR,1812L200THPR,72R050XPR,1812L125/16,12VL175XLU,0805L010YR,30R500UF,1812L75/24,16R700G,16R700GKLF,60R135X,2920L185,60R110X,1210L075,1812L160/12,16R900GF,1812L110,600R150-RBZR,600R,1812L125/6,60R040XPR,250R120-R1ZR,250R120-RFU,16R600G,2920L030,2920L150,30R800U,2016L100,1812L035/30DR,1812L075/24DR,16R135BU,250R120,30R185UU,SL,1812L010DR,2920L125PR,1206L200,1206L050YR,30R185U,ST,0603L150SLYR,1206L380SLTH,60R160XF,72R020X,30R600UMR,1812L300SL,60R050XU,0805L075SL,0805L260SLTHYR,72R250X,06SL370G,30R300,2016L075/060,1210L175,72R020XU,1812L260SLPR,250R180TF,16R1400GH,16R090BU,250R120-RAZR,0805L150SL,1812L050/30PR,30R160U,1210L260SLYR,60R065XPR,0805L020YR,1210L,1206L350SLTHYR,60R017X,1206L075SLYR,1206L110THYR,72R040XPR,2920L250DR,30R500,1210L110TH,1812L110/24DR,250R120-RCU,2016L200,0603L050YR,0805L300SLWR,1812L200,06R155BU,72R250XF,250R145,60R017XU,1812L020/60DR,1812L035/30,0603L050,1812L125/6PR,30R400,1206L400SL,60R030XPR,1210L350SLWR,60R300XF,VL,1206L260SLTH,06R120BU,72R065XU,1812L300MR,1210L400SLWR,VT,1210L450SL,16R,2920L500/16MR,1206L300SLTH,2920L075,250R120-RAU,72R030XU,250S130-RC,250S130-RB,16R110BU,250S130-RA,1812L300,2920L100PR,250S130,30R110UPR,30R250U,1206L110/12SLYR,0805L175SLYR,72R135X,0805L075WR,1206L016,16R500G,1206L150/12SL,0603L175SLYR,30R250UU,30R900U,16R900GMR,72R185XF,16R090B,1206L012,1206L075/13.2WR,600R150-RAZR,72R110X,1210L075/24,72R025X,0805L050,60R065XU,72R075X,1210L300SL,72R160X,0603L020,250R080ZR,72R090XU,1210L200SLYR,250R120TZR,60R185X,0603L025,0805L100WR,06R120B,2920L200/24DR,250R180,30R135U,60R040X,1206L025,06SL190GM,600R160-RA,72R135XF,06R075BPR,1206L020,1210L005,600R160UR,250R145-RBZR,12VL175XL,6

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型号- 0805L020X4X5,1812L050XXYYYYY,0603L008XXYYYYY,0603L10PSLXXYYYYY,1206L020XXYYYYY,1206L112XXYYYYY,1210L110XXYYYYY,1206L400SL-SXXYYYYY,1206L116XXYYYYY,1206L112S LXXYYYYY,1206L024XXYYYYY,1206L300SLXXYYYYY,2920L516XXYYYYY,1206L750SLXXYYYYY,1812L200XXYYYYY,1206L300SLTHXXYYYYY,X1LX2X3YYZZZZZ,2920L030X4X5,0603L100SLX4X5,0805L005XXYYYYY,0603L075SLX4X5,1812L550SLXXYYYYY,1812L370SLX4X5,0603L010X4X5,0805L075X4X5,0805L150ULXXYYYYY,2920L524SLXXYYYYY,1812L150THXXYYYYY,1206L050XXYYYYY,1206L350SLTHXXYYYYY,2920L200X4X5,0805L100THXXYYYYY,0603L025X4X5,1812L024X4X5,1206L380SLTHXXYYYYY,0402L005XXYYYYY,0805L100,1206L200SLX4X5,1812L260SLX4XS,1206L124SLXXYYYYY,1812L600SLXXYYYYY,1812L020XXYYYYY,1210L200SLXXYYYYY,0805L050THXXYYYYY,1206L050SLXXYYYYY,1812L200THXXYYYYY,2920L224X4X5,1206L400SLTHXXYYYYY,2016L133X4X5,1210L175X4X5,1812L050-CX4X5,2920L160XXYYYYY,1812L160-CX4X5,1206L050SLX4XS,1812L150-C,1812L033X4X5,1206L230SLXXYYYYY,1812L260-C,1210L350SLXXXYYZZZZZ,2920L700SLXXYYYYY,1812L300X4X5,1210L200X4X5,2016L500XXYYYYY,1812L110THXXYYYYY,0805L020SLXXYYYYY,1210L200,1812L035XXYYYYY,1206L078X4X5,1210L400SLXXYYYYY,1210L260SLXXYYYYY,1206L175X4X5,1206L005XXYYYYY,1812L800SLXXYYYYY,0805L024XXYYYYY,1812L010X4X5,1812L125-CX4X5,1206L150THX4X5,0805L075SLX4X5,0805L110SLX4X5,1210L024X4X5,1206L500SLXXYYYYY,0603L300SLXXYYYYY,1210L450SLTHXXYYYYY,2920L300,1206L110-CX4X5,1206L015X4X5,1206L075-CX4X5,1210L650SLXXYYYYY,0805L110ULXXYYYYY,0805L300SLXXYYYYY,1206L150THXXYYYYY,1812L216X4X5,1206L112SLXXYYYYY,1812L370SLXXYYYYY,1206L016XXYYYYY,2016L060XXYYYYY,1812L200THX4X5,1206L020-C,1206L200X4X5,1206L035XXYYYYY,0805L035X4X5,1210L450SLXXYYYYY,1206L312SLXXYYYYY,0805L030XXYYYYY,1812L160X4X5,0603L004XXYYYYY,1812L850SLXXYYYYY,1210L380SLXXYYYYY,2920L125X4X5,2016L133XXYYYYY,0402L020SLXXYYYYY,0402L035SLXXYYYYY,1812L010XXYYYYY,1210L090XXYYYYY,0805L260ULTHXXYYYYY,0805L125?LX4X5,1812L200 XXYYYYY,0603L035X4X5,1206L512SLXXYYYYY,1210L150XXYYYYY,1206L075X4X5,1206L380SLXXYYYYY,2920L612XXYYYYY,0603L003XXYYYYY,2016L030X4X5,2920L616XXYYYYY,1812L124L,1206L075THXXYYYYY,1206L050-C,1206L160X4X5,1206L075SLX4X5,1812L060XXYYYYY,1210L110THXXYYYYY,0603L075SLXXYYYYY,1812L212XXYYYYY,1812L216XXYYYYY,0603L100ULXXYYYYY,1206L110THXXYYYYY,1812L213.2X4X5,0805L175SLXXYYYYY,0805L050THX4X5,1812L050X4X5,1812L500SLXXYYYYY,X1LX2X3X4X5,1206L025/24X4X5,1812L075-C,2016L075XXYYYYY,0805L110XXYYYYY,0805L100X4X5,1210L260SLX4X5,0402L050SLXXYYYYY,1206L110SLXXYYYYY,1206L800SLXXYYYYY,1210L900SLXXYYYY,1812L350SLXXYYYYY,1812L124X4X5,1812L075-CX4X5,1812L190SLX4X5,2920L250X4X5,1812L200-CX4X5,1812L075XXYYYYY,1206L150-C,1206L075THX4X5,1210L030XXYYYYY,1812L900SLXXYYYYY,2920L110XXYYYYY,1206L11OSLXXYYYYY,1206L075-C,1206L150-CX4X5,2016L050,1206L035-CX4X5,1812L750SLXXYYYYY,1210L500SLXXYYYYY,1210L175SLXXYYYYY,1812L160-C,0805L050X4X5,2920L150X4X5,1206L012X4X5,1210L150X4X5,1812L030X4X5,2920L072XXYYYYY,06 03L001XXYYYYY,2920L600SLXXYYYYY,2920L224XXYYYYY,0603L309SLXXYYYYY,1206L012XXYYYYY,1812L312SLXXYYYYY,1812L190SLXXYYYYY,1206L650SLXXYYYYY,1210L050X4X5,2920L050X4X5,1206L110XXYYYYY,0805L260SLTHXXYYYYY,1206L075SLXXYYYYY,2016L260XXYYYYY,1812L050-C,1210L350SLXXYYYYY,1206L212SLXXYYYYY,0805L200SLXXYYYYY,2920L600XXYYYYY,2016L030,2016L150,1206L150SLXXYYYYY,1812L126,1812L125,1210L112XXYYYYY,0805L350SLXXYYYYY,1210L116XXYYYYY,1812L700SLXXYYYYY,1206L024SLXXYYYYY,2920L050,1812L124,1210L150THX4XS,1210L050XXYYYYY,1812L133X4X5,1812L230X4X5,0805L110THXXYYYYY,2920L415XXYYYYY,2016L150XXYYYYY,1812L116,1210L075/24X4X5,1812L115,1812L350SLX4X5,2920L185,1210L075,1812L125-C,2920L060,1210L750SLXXYYYYY,2016L133,1210L300SLXXYYYYY,1206L150SLX4X5,1812L112,2920L624SLXXYYYYY,1812L110,1812L200-C,1812L230,1206L050X4X5,2016L300XXYYYYY,1206L110SLX4X5,1812L268X4X5,0603L036XXYYYYY,1206L400SLXXYYYYY,2920L100X4X5,X1LX2X,1812L450SLXXYYYYY,1812L324SLXXYYYYY,1812L110X4X5,2920L030,0805L010XXYYYYY,2920L330XXYYYYY,2920L150,2016L100,1206L200,2920L2604XXYYYYY,0603L050XXYYYYY,X1LX2X3 SERIES,1812L216,1206L200SLXXYYYYY,0805L1126LXXYYYYY,1812L125X4X5,1210L035XXYYYYY,0603L002XXYYYYY,X1LX2SLXXYYYYY SERIES,1210L175,1812L212,1812L020X4X5,1812L150THX4XS,1206L025-CX4X5,1206L109,1206L260SLXXYYYYY,1210L200SLX4X5,2920L260X4X5,1812L650SLXXYYYYY,2920L300X4X5,2920L400XXYYYYY,2016L200,1812L116X4X5,1206L035X4X5,1206L100,1812L200THXXYYYYYL,1812L150X4X5,0603L150SLXXYYYYY,1206L350SLXXYYYYY,1812L150-CX4X5,0603L050ULXXYYYYY,1812L125XXYYYYY,0805L125SLXXYYYYY,1206L020-CX4X5,06 03L060XXYYYYY,0805L15QSLX4X5,1210L206SLXXYYYYY,1206L700SLXXYYYYY,1206L100X4X5,0805L024SLXXYYYYY,0805L150SLXXYYYYY,1206L030XXYYYYY,2920L075,1210L035X4X5,1210L800SLXXYYYYY,1812L260-CX4X5,1812L260X4X5,1812L300,0603L075ULXXYYYYY,1206L125,1206L175SLXXYYYYY,1812L075X4X5,1206L016,0603L050SLX4X5,1210L020X4X5,0603L020X4X5,1206L050-CX4X5,1812L213.2,1210L600SLXXYYYYY,1812L126X4X5,2920L185X4X5,1206L015,1206L012,2920L315X4X5,1210L110THX4X5,0805L075ULXXYYYYY,X1LX2SLXXYYYYY,1206L060XXYYYYY,0805L050,1206L035-C,1812L212X4X5,1812L115X4X5,2920L324XXYYYYY,0603L020,1206L016X4X5,0805L300SLTHXXYYYYY,1206L110-C,2920L700XXYYYYY,0603L025,1812L110-C,1206L025,1

测试报告 - LITTELFUSE - 27.04.2022 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

RKEF250K PolySwitch® PTC Devices

型号- RKEF250K

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

【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

LVR075S-1 PolySwitch® PTC Devices

型号- LVR075S-1

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

Littelfuse（力特） 1812L系列自恢复型PTC产品数据手册

型号- 1812L075-C,1812L,1812L075/33,1812L160/12DR,1812L150/24,1812L010/60DR,1812L260/12MR,1812L035/60,1812L160,1812L260/16MR,1812L110/24DR,1812L110-C,1812L150ZR,1812L200,1812L260THDR,1812L200THPR,1812L125/16,1812L380/12THYR-A,1812L020PR,1812L110/33,1812L035/30,1812L020/60DR,1812L150/12,1812L125/6PR,1812L150/16,1812L200/12,1812L200/16,1812L160/12,1812L300MR,1812L110,1812L020/60,1812L075,1812L125/16DR,1812L160PR,1812L075/33DR,1812L260TH,1812L150,1812L125/6,1812L010/60,1812L110/33MR,1812L160-C,1812L260/16,1812L075PR,1812L050/30,1812L050PR,1812L110/24,1812L260/12,1812L300,1812L075/24DR,1812L035/30DR,1812L010DR,1812L020,1812L014DR,1812L110PR,1812L200TH-C,1812L200DR,1812L110/16,1812L150/16DR,1812L260TH-C,1812L075/24,1812L200/12DR,1812L050/60,1812L150-C,1812L150/12DR,1812L200/16DR,1812L050,1812L110/16DR,1812L150/24MR,1812L014,1812L050-C,1812L010,1812L200TH,1812L050/30PR

数据手册 - LITTELFUSE - Revised: 05/03/17 - 2017年05月03日 PDF 英文下载