【应用】集成隔离电源的数字隔离器NIRSP31助力458通信隔离,尺寸小至4x5mm
RS485收发器具有抗共模干扰能力强、成本低、抗噪能力强、传输距离远、传输速率高等优点广泛应用于工业智能仪表,通讯设备等各个领域。从应用来分为非隔离型和隔离型的。隔离485是在非隔离485的基础上增加隔离性能,使得电路具有更强的抗干扰性和系统稳定性。
针对空间体积有限的小型化产品设计,一般采用集成度高的方案,如带电源的隔离485收发器,但是一般隔离带电源的485封装也是比较大,本文重点介绍国产纳芯微电子推出的集成了隔离电源和三通道数字隔离器NIRSP31(如下图1),相比传统的方案隔离电源模块+光耦+485收发器的方案具有小尺寸,高可靠性,低成本的优势,减少PCB面积,以及外围器件数量,降低了整体方案成本,提高了集成度,简化设计。
图1 NIRSP31隔离的RS485原理图
如下图2,NIRSP31集成的隔离式DC/DC转换器采用片上变压器可提供高达300mW的输出功率,支持2kVrms绝缘耐压,支持1.8V~5.5V的MCU I/O电平,具有过流(110mA)和过温(165℃)保护,较高的共模抗干扰能力CMTI为50kV/μs,传输延时小于50ns,通信速率高达20Mbps,具有高系统级EMC性能,增强的系统级ESD、EFT、以及浪涌防护能力,超小的封装体积LGA18 4mm×5mm。
图1 NIRSP31的PIN脚定义
综上所述,纳芯微集成隔离电源的数字隔离器NIRSP31助力458通信隔离具有几下几点优势;
1、采用了先进的LGA封装工艺,封装尺寸小至4mm×5mm ,减小布板面积,提高集成度以及可靠性降低低成本,简化设计;
2、集成的隔离电源采用业内领先的片上变压器技术,拥有自主IP,避开专利风险;
3、支持关断低功耗,具有EN管脚,针对要求低功耗的应用设计非常合适;
4、具有高系统级EMC性能,增强的系统级ESD、EFT、以及浪涌防护能力;
5、CMTI最低50kV/us,具有较高的共模抗干扰能力;
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可定制射频隔离器/环行器(10M-40GHz),双工器/三工器(30MHz/850MHz-20GHz),滤波器(DC-20GHz),功分器,同轴负载,同轴衰减器等射频器件;可定制频率覆盖DC~110GHz,功率最高20KW。
最小起订量: 1 提交需求>
可定制波导隔离器频率覆盖5.5GHz~110GHz,插损损低至0.25dB、隔离度、正向方向功率、封装尺寸参数。
最小起订量: 1pcs 提交需求>
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