【选型】锂电池CR123A供电智能家居产品过流保护器件选型推荐：自恢复保险丝1812L260，使设计满足EN60950
锂电池或者铅酸电池供电的产品，如果电池没有保护板，当系统短路时，若电池容量过大，就会引起电池爆炸，造成火灾危险。本文主要介绍了选择LITTELFUSE的过流保护器件PolySwitch 1812L260应用在锂电池CR123A供电智能家居产品上，使设计满足EN60950的安规要求。
根据EN60950标准 2.5 小节，受限制功率源应依从以下条件：输出受到固有的限制，应符合Table 2B限制；线性或非线性的阻抗输出也应符合Table 2B限制；若设计中使用PTC，所选PTC应通过IEC 60730-1第15, 17, J.15和J.17条规定的测试，或者符合IEC 60730-1对第2类设备的要求；使用过流保护设备的情况下，输出应符合Table 2C限制；若使用过流保护设备，则应该使用保险丝或不可调，不可自动恢复的机电设备。
笔者参与的智能家居产品采用3节CR123A电池并联供电，在电池并联的情况下，电池内阻变成单节电池的1/3，需要考虑系统短路一分钟后，电流避免大于8安培的情况；同时也要避开EN60950 4.7.2.1 中所要求的防火外壳；另外，EN60950 4.3.8 要求电池供电产品设计时应考虑减少火灾，爆炸等危险，包括电路内部故障和反极性安装等所造成的危险。因此要满足EN60950的安规要求，电池防反设计和过流保护设计必须考虑在内。由于机械结构设计上考虑了电池防反装置，因此原理图设计时为了节省成本，只加了过流保护设计。
通常电池供电的产品设计时过流保护器件会选用PolySwitch自恢复保险丝。PolySwitch是一种以传导性聚合物为基础的热敏电阻，具有正温度系数能力，阻抗随温度的增加而增大。选用Littlefuse的Polyswitch 1812L260，原理图设计如图1所示。该器件保持电流为2.6A，最大阻值为0.055欧姆，在系统正常工作电流情况下，对于电池电压的跌落影响很小，该器件已用于其它电池供电的产品上，且已经大批量生产，满足EN60950的安规要求。
图1 原理图设计
Littelfuse的过流保护器件根据封装尺寸有 Nano SMD, 0805L, LVR,1206L,2920L,1210L,1812L,2016L,30R,72R等，可根据产品设计需要选择不同封装尺寸的过流保护器件，选型参考指导如下：
确定产品应用的工作电压，工作电流，工作温度，封装要求。
根据温度递减曲线，查出环境温度下的保持电流折减比例，算出相应的保持电流。
根据计算的保持电流选择PolySwitch，要求选择的保险丝的保持电流大于计算的保持电流。
例如：该电池供电的智能家居产品，正常工作最大电流为1.2A，环境最高温度55度，工作电压3V，选1812L系列，根据温度递减曲线查出1812L在55℃时有70%衰减，那么Ihold=1.4/0.7=2 A。1812L260 保持电流为2.6A，满足需求。PCB布局如图2所示，电源走线从电池正极出来，经过1812L260，然后给系统供电。
图2 Littelfuse 1812L260 PCB布局
经过测试，电池电压经过1812L260，电压跌落几乎为0，可忽略不计。该产品已经通过CE认证且批量生产。
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型号- 30V-050,YAZ1P5D47,25D301K,SMAJ6.0CA,SMAJ40CA,ESDLC24VD8B,3R075L-8X10,HLT9P04C,HLS150N30K,YAZ1P5D51,5.0SMDJ170A,P8SMB120CA,16V-110,15KP58A,SMD1206-351,YAZ1P5D3V3,ESDLC15VD3B,YAZ1P5D3V6,RS3BBF,YAZ1P5D56,5D361KJ,HLS135N100,P8SMB13CA,YAZ1P5D3V9,HLS80R1K5,SMDJ78CA,HLP9N90,ES2JBF,ESDLC8V0D3B,S2MB,1812 SERIES,PGB0603-05,YC2M2012B121GBE,YAZ1P5D62,Y1ZP35D43G,HLS80R1K1,10D560KJ,SMCJ14CA,5D121KJ,P8SMB60A,S2MF,YAZ1P5D68,HLT30P55,HLS70N40K,HLP9N80,30V-075,5.0SMDJ85A,PGB0603-12,SMCJ100CA,SMBJ300A,YAZ1P5D75,5KP30A,HLS55N100PF5,SMF120CA,SMBJ150CA,16V-135,SMDJ170A,SMAJ70A,33D-7,250V SERIES,HLP9N70,33D-5,PGB0603-24,HLT9P03C,SMDJ58A,33D-9,HLG3401A1N,32D122K,SA48CA,SMCJ30A,YAZ1P5D82,ESD12VAP,HLP2P06C,10D-11,HLP14N80,SA180A,10D-13,10D-15,15KP54A,20D781KH,20D781KJ,15KP120CA,YAZ1P5D91,SA22CA,P6KE8.2CA,SMAJ100A,16V-160,5.0SMDJ170CA,SA110CA,HLS60200K,ESD12VD3,HLT30P10,SMDJ54A,10D680KJ,SMD1210-150-6V,SMDJ160CA,3KP14CA,SMBJ400CA,5KP SERIES,SMF36CA,ESD24VAP,ESD12VD8,ESD12VD5,7D220KJ,P6SMB51CA,ESD12VD9,10D K 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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
竞沃电子将参加2024中国宁波（华东）智能家居创新峰会
本次智能家居技术创新峰会将设立第46届（宁波）AIoT＆智能照明与驱动技术研讨会、第四届(宁波）家电电源与智能控制技术研讨会两大论坛，将对LED驱动电路设计与优化、开关电源设计原理与优化、智能家居安全与隐私保护、电源设计方案、智能控制算法、智能灯控中的传感器和先进控制器等前沿技术的研究及应用案例等技术话题进行深入的研讨。
Littelfuse多种汽车电子保护器件，助力实现稳健的车载通信
本文介绍了多种汽车电子保护器件，包括TVS二极管阵列、瞬态抑制二极管、ESD抑制器和自恢复保险丝，旨在提高汽车系统的安全性、便利性和舒适性。
【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
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。
LFPCN#41490:4个低电阻率SMD PPTC部件号的产品停产通知
描述- Littelfuse发布产品生命周期管理通知，将淘汰4款低ρ SMD PPTC元器件型号。具体淘汰型号及推荐替代型号如下表所示。用户应自行评估替代型号的适用性并在自身应用中进行测试。最后购买时间从2023年12月31日起，最后发货时间从2024年2月28日起。如有疑问，请联系当地Littelfuse销售办公室或授权分销商。
型号- 1210L175SLYR,1210L380SLYR,1812L370SLPR,1812L350SLPR,1812L260SLPR,1812L270SLPR,1210L200SLYR,1210L400SLWR
功率涵盖200W~15000W！TVS瞬态抑制二极管制造商音特电子授权世强硬创代理
音特电子授权世强硬创代理旗下ESD静电保护元件、PPTC自恢复保险丝、TSS半导体放电管、SBR肖特基二极管等产品，其中，TVS瞬态抑制二极管作为主推产品之一，功率涵盖200W~15000W！
在伺服驱动器的预充电电路中，采用可控硅做软起动控制，其驱动采用变压器驱动，由于在实测时发现变压器存在磁芯饱和而电流短路的情况，所以希望能找一款过流保护器件？
可控硅驱动采用变压器驱动，脉冲变压器如果磁芯饱和就会有电流短路的情况，推荐采用littelfuse的自恢复保险丝PTC，型号0805L050WR和 0603L020YR，响应时间0.1ms，可以实现可靠地保护。
普罗森美将携电路保护器件和组合电路保护方案出席于PCIM Asia，拥有相关发明和实用新型专利80余项
普罗森美将携电流检测电阻、过流/过压保护器件和功率器件等产品出席于PCIM Asia！普罗森美产品涵盖各系列全尺寸的微阻值电流传感电阻、贴片保险丝、放电管、瞬态抑制二极管、静电抑制器、工业熔断器等，拥有相关发明和实用新型专利80余项。
里阳半导体（Liown）汽车行业保护器件选型指南
目录- 公司简介 产品概述 汽车瞬态干扰相关标准 汽车AEC-Q101测试标准 汽车电子架构及保护器件应用
型号- SMBJ5.0A,SM6S24A,SMCJ440A-Q,2R090MM-8,30KP-Q,SM8S33A,SMBJ6.5A,15KP36A-Q,5KP-Q,SM6S,SMCJ75A-Q,5KP36A-Q,SMBJ6.5CA,15KP-Q,SM8S30A,2R075ML-8,5.0SMDJ36A-Q,561KD20J,LTHXXA-YYBWGH,5.0SMDJ-Q系列,5KP33A-Q,SM8S系列,220KD10,220KD10J,20KP-Q,SMCJXXA,2R090ML-8,5KP24A-Q,SMBJ7.0A,180KD10,15KP30A-Q,5KP系列,5.0SMDJ-Q,SM8S,180KD10J,5.0SMDJ24A-Q,5KP,15KP20A-Q,SMBJ7.0CA,15KP24A-Q,15KPXXA-Q,SMBJ6.0A,SM8S20A,SM8SXXA,SMBJ30CA-Q,2R075MM-8,5.0SMDJ75A-Q,2R800ML-8,SMBJ16CA,SMBJ6.0CA,SM8S24A,SM8S36A,SM6S系列,P6SMAJ33CA-Q,SMBJ5.0CA
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