【选型】为空调控制板输入电源过流防护选择一款合适的可恢复保险丝：1812L150/24MR，最大额定工作电压为24VDC

时间： 2020-07-02 来源：Littelfuse

技术问答

空调控制板上一般需要+12V电源给电机内置风速检测电路使用，正常工作时输出电流一般小于1 A，为避免后级电路短路异常造成过电流而出现可燃风险，建议在电源输入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：以1.5倍过压考量，建议选择耐压为18V以上保险丝；

2、额定电流考量：这个主要与负载相关，输入电流按1.2A倍过流防护考量，选择保持电流为1.5A、动作电流为3.0A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1812L150/24MR，采用1812表面贴装设计，最大工作电压为24VDC，保持电流1.5A，动作电流3.0A，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1812L150/24MR典型电性参数

推荐Littelfuse（力特）可恢复保险丝1812L150/24MR理由如下：

1、高耐压：最大额定工作电压为24VDC，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1812L150/24MR的保持电流Ihold为1.5A，Rmin=0.04Ω，Rmax=0.12Ω，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=1.5*1.5*0.05=0.1125（W），Pmax=1.5*1.5*0.15=0.3375（W），即待机状态时的功耗为0.1125W~0.3375W。

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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如何为汽车电动车窗控制开关选择一款汽车级自恢复保险丝实现瞬时过载电流保护？

汽车电动车窗的控制开关接触瞬间会有很大的瞬时峰值电流，约300mA~500mA，持续时间约50ms以内，仅靠电阻无法做到快速响应保护，故设计电路需要再加一级保护，在电源线上串接一颗额定电压30VDC、保持电流Ihold为0.1A，跳闸电流Istrip为0.25A的littelfuse可恢复保险丝microASMD010F，实现瞬时过载电流保护，让控制系统实现高可靠性。

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【选型】车载中控娱乐系统12V电源输入过流防护推荐可恢复保险丝miniASMDC150F/24

乘用车车载中控娱乐系统采用12VDC供电，为防止因负载短路异常而出现的大电流造成相关电子器件烧毁风险，一般需要在电源输入串联一颗可恢复保险丝做过流保护设计，推荐选择littelfuse的miniASMDC150F/24，采用1812表面贴装，最大工作电压为24VDC，保持电流1.5A，动作电流3A。

器件选型发布时间 : 2020-09-13

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为避免汽车后视镜控制器输入电源因过流而烧毁后级电路，一般需要对输入电源加入可恢复保险丝做郭楼防护，本文推荐选择Littelfuse的可恢复保险丝2920L200/24DR，最大工作电压为24VDC，保持电流Ihold为2A，动作电流Itrip为4A，最大跳闸电流8A，最大跳闸时间5s，最小电阻0.05Ω，最大电阻0.125Ω，工作温度范围-40℃~85℃，可满足设计需求。

器件选型发布时间 : 2020-02-23

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

1812L Series Surface Mount

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

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型号- 1812L75/33,1812L SERIES,1812L,1812L075/33,1812L160/12DR,1812L150/24,1812L010/60DR,1812L260/12MR,1812L035/60,1812L160,1812L260/16MR,1812L110/24DR,1812L150ZR,1812L260THDR,1812L200THPR,1812L125/16,1812L380/12THYR-A,1812L75/24,1812L110/33,1812L020PR,1812L035/30,1812L020/60DR,1812L150/12,1812L125/6PR,1812L150/16,1812L200/12,1812L200/16,1812L160/12,1812L300MR,1812L020/60,1812L110,1812L075,1812L125/16DR,1812L160PR,1812L260TH,1812L075/33DR,1812L150,1812L125/6,1812L010/60,1812L110/33MR,1812L260/16,1812L075PR,1812L050/30,1812L050PR,1812L110/24,1812L260/12,1812L300,1812L035/30DR,1812L075/24DR,1812L010DR,1812L020,1812L014DR,1812L110PR,1812L110/16,1812L150/16DR,1812L075/24,1812L200/12DR,1812L050/60,1812L150/12DR,1812L200/16DR,1812L050,1812L110/16DR,1812L150/24MR,1812L014,1812L010,1812L200TH,1812L050/30PR

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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

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型号- 1812L75/33,1812L SERIES,1812L,1812L075/33,1812L160/12DR,1812L150/24,1812L010/60DR,1812L260/12MR,1812L035/60,1812L160,1812L260/16MR,1812L110/24DR,1812L150ZR,1812L260THDR,1812L200THPR,1812L125/16,1812L380/12THYR-A,1812L75/24,1812L110/33,1812L020PR,1812L035/30,1812L020/60DR,1812L150/12,1812L125/6PR,1812L150/16,1812L200/12,1812L200/16,1812L160/12,1812L300MR,1812L020/60,1812L110,1812L075,1812L125/16DR,1812L160PR,1812L260TH,1812L075/33DR,1812L150,1812L125/6,1812L010/60,1812L110/33MR,1812L260/16,1812L075PR,1812L050/30,1812L050PR,1812L110/24,1812L260/12,1812L300,1812L035/30DR,1812L075/24DR,1812L010DR,1812L020,1812L014DR,1812L260,1812L110PR,1812L110/16,1812L150/16DR,1812L075/24,1812L200/12DR,1812L050/60,1812L150/12DR,1812L200/16DR,1812L050,1812L110/16DR,1812L150/24MR,1812L014,1812L010,1812L200TH,1812L050/30PR

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