【选型】为出口欧美市场手持吸尘器输入电源过流防护选择一款合适的可恢复保险丝：2920L185DR，满足UR认证

时间： 2020-06-16 来源：Littelfuse

技术问答

为满足欧美出口手持吸尘器高功率负载输出的需求，其电源电压会选择6节锂电池串联设计，其输出电压范围18V~25.2V（4.2V/节*6节），平均输出电压22.2V（3.7V/节*6节），正常工作时输出电流一般小于1.5A，为避免负载电机堵转或短路异常造成过电流而出现可燃风险，符合UL安规认证需求，一般需要在电池母线上串联一颗可恢复保险丝做过流保护设计，此可恢复保险丝选型因素参考如下：

1、额定电压考量：需要大于锂电池组上限电压25.2V，建议选择耐压为25.2V以上保险丝。

2、额定电流考量：这个主要与负载相关，以1.2倍过流防护考量，输入电流按1.5A评估，选择保持电流为1.8A、动作电流为3.6A保险丝即可。

3、通过UR认证

针对如上的设计需求，推荐选择LITTELFUSE（力特）的可恢复保险丝2920L185DR，采用2920表面贴装设计，额定电压为33VDC，保持电流1.85A，动作电流3.7A，工作温度范围-40℃~85℃，有通过UR认证，可满足欧美出口安全认证，典型电性参数参考如下图1所示。

图1：Littelfuse（力特）可恢复保险丝2920L185DR典型电性参数

推荐Littelfuse（力特）可恢复保险丝2920L185DR理由如下：

1、高耐压：最大额定工作电压为33V，可满足1.3倍过压的设计要求，设计裕量更多，具有更高的安全性；

2、低待机功耗：可以通过计算得出，利用P=Ihold*Ihold*R得出，其中littelfuse（力特）的可恢复保险丝2920L185DR的保持电流Ihold为1.85A，Rmin=0.05Ω，Rmax=0.15Ω，其中Ihod、Rmin和Rmax可通过图1中电性参数表格获取，带入公式得到Pmin=1.8.5*1.8.5*0.05=0.171（W），Pmax=1.85*1.85*0.15=0.513（W），即待机状态时的功耗为0.171W~0.513W。

3、世强平台常备库存，具有良好的供货交期，可以快速支持样品和量产服务。

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Littelfuse（力特）正温度系数（PTC）热敏电阻选型指南

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

选型指南 - LITTELFUSE PDF 中文下载

2920L Series Surface Mount PolySwitch® Resettable PPTC Datasheet

型号- 2920L185DR,LF075-60,2920L110/60MR,LF500-16,2920L400/15MR,2920L250DR,2920L250,2920L300/15,LF260-24,2920L050,2920L200/24DR,LF110,LF075,LF030,LF150,2920L075/72,LF075-72,2920L200/24,2920L330/24,2920L700/12,2920L300DR,2920L400/15,2920L185,2920L260,2920L030DR,LF125,LF400,LF200,LF300-15,LF600-16,2920L300,2920L200DR,LF600-12,2920L100,2920L260/24DR,2920L075/60,2920L600/12MR,2920L700/12MR,2920L500/16,2920L600/16MR,2920L500/16MR,2920L075,2920L600/16,2920L030,2920L150,2920L075/60MR,LF700-12,2920L600/12,2920L100PR,LF330,2920L125PR,2920L110/60,2920L330/24MR,LF250,LF050,2920L SERIES,2920L260PR,2920L150DR,2920L380/12THYR-A,LF200-24,LF300,2920L300/15DR,LF100,2920L125,2920L260/24,2920L050DR,LF185,2920L,2920L200,2920L075DR,LF260,2920L075/72MR

数据手册 - LITTELFUSE - 01/10/23 PDF 英文下载查看更多版本

2920L Series Surface Mount

型号- 2920L185DR,2920L110/60MR,2920L400/15MR,2920L250DR,2920L250,2920L300/15,2920L050,2920L200/24DR,2920L150/60,2920L260/33,2920L075/72,2920L200/24,2920L330/24,2920L700/12,2920L300DR,2920L400/15,2920L185,2920L260,2920L030DR,2920L300,2920L200DR,2920L100,2920L260/24DR,2920L075/60,2920L600/12MR,2920L700/12MR,2920L500/16,2920L600/16MR,2920L500/16MR,2920L075,2920L600/16,2920L260/33DR,2920L030,2920L150,2920L075/60MR,2920L600/12,2920L050/72,2920L100PR,2920L125PR,2920L110/60,2920L330/24MR,2920L035,2920L SERIES,2920L260PR,2920L150DR,2920L380/12THYR-A,2920L150/60MR,2920L050/72DR,2920L300/15DR,2920L125,2920L260/24,2920L050DR,2920L200,2920L075DR,2920L035DR,2920L075/72MR

数据手册 - LITTELFUSE - 09/22/23 PDF 英文下载查看更多版本

2920L Series Surface Mount

型号- 2920L185DR,2920L110/60MR,2920L400/15MR,2920L250DR,2920L250,2920L300/15,2920L050,2920L200/24DR,2920L075/72,2920L200/24,2920L330/24,2920L700/12,2920L300DR,2920L400/15,2920L185,2920L260,2920L030DR,2920L300,2920L200DR,2920L100,2920L260/24DR,2920L075/60,2920L600/12MR,2920L700/12MR,2920L500/16,2920L600/16MR,2920L500/16MR,2920L075,2920L600/16,2920L030,2920L150,2920L075/60MR,2920L600/12,2920L100PR,2920L125PR,2920L110/60,2920L330/24MR,2920L SERIES,2920L260PR,2920L150DR,2920L380/12THYR-A,2920L300/15DR,2920L125,2920L260/24,2920L050DR,2920L,2920L200,2920L075DR,2920L075/72MR

数据手册 - LITTELFUSE - 06/23/23 PDF 英文下载