【选型】国产陶瓷快熔保险丝CC213A003用于自行车计速码表，最大额定工作电压63Vdc

时间： 2022-09-15 来源：世强

技术问答

自行车计速码表一般从主电源的12Vdc或24Vdc可充电电池上取电，经过适配器电路输出5V/2A给自行车计速码表上的可充锂电池充电，为避免因负载短路或过充异常造成燃烧或爆炸风险，建议在主电源母线输出加一颗快熔断保险丝做过流保护设计，选型因素参考如下：

1、额定工作电压：为兼容12Vdc或24Vdc电池供电，以2倍过压考量，建议选择耐压至少48Vdc保险丝；

2、额定工作电流：与负载功率大小相关，考虑到速码表充电电流2A，以1.5倍过流考量，建议选3A快熔断保险丝更合适些；

3、考虑空间结构限制，建议选择小尺寸表贴封装保险丝设计；

针对如上的设计需求，推荐选择电安科技（DA Technology）陶瓷快熔保险丝 CC213A003，0603表贴封装，最大额定工作电压63Vdc，额定工作电流3A，分断电流能力达50A@63VDC，工作温度范围-50℃~125℃，典型电性参数参考如下图1所示。

图1：电安科技（DA Technology）陶瓷快熔保险丝CC213A003典型电性参数

推荐理由如下：

1、宽工作温度范围：-50~125℃，具有出色的高低温环境下过流防护能力；

2、采用0603表贴封装，满足小型化设计需求；

3、分断电流能力50A，具有出色的高安全切断电流能力；

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选型指南 - 电安科技 - Rev: B - 2018.12 PDF 英文下载