【应用】基于国产TSS半导体放电管P0080SB/P0080SC的模拟视频接口防护设计方案

时间： 2019-04-13 来源：硕凯电子

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BNC，全铜加厚焊接型BNC接头，抗腐蚀能力强，适用于道路监控、化工环境、样板工程等各类监控工程。BNC传输基带视频信号用的。监控用设备单个BNC口是传输的是模拟复合信号，录像机把模拟视频信号编码压缩成视频文件保存在硬盘里。目前监控用的摄像头出来的都是模拟信号，可以用75欧 -3或-5的视频电缆。超过200米还可以加视频放大器。

通常暴露于户外，因此极易因为雷击等原因引入过电压。在有强烈的浪涌能量出现时，甚至可以看到线路板焦糊的现象。因此防雷击保护成为 BNC接口设计必须要考虑的。

推荐防护方案电路：

方案说明：

使用TSS半导体放电管器件型号：P0080SB/P0080SC

方案可以通过测试等级：GB/T17626.5 中的10/700us 40ohm 4-6KV测试

方案特点和优势：

1、电阻R2作为退耦和限流作用，推荐0-20Ohm封装0805/1206的，可以根据视频图像质量来选择。

2、TSS半导体放电管P0080SB/P0080SC结电容小，有利于视频传输，保证图像的完整性。

3、TSS半导体放电管P0080SB/P0080SC防护后，残压比较低，低于5V，保护作用明显。

4、TSS半导体放电管P0080SB/P0080SC产品封装一致，可根据测试要求适当选择，不需要更改PCB设计。

TSS半导体放电管P0080SB/P0080SC封装尺寸：标准SMB封装

TSS半导体放电管P0080SB/P0080SC详细参数：

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沉浮 Lv7. 资深专家 2019-04-13

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