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正常工作状态(无ESD事件)的主要特性
由于ESD保护二极管反向连接,正常工作时,其两端电压低于反向击穿电压(VBR)。因此,ESD保护二极管正常工作时不导通。此时,pn结形成耗尽层,二极管起电容器作用。选择ESD保护二极管时,以下三个注意事项适用于正常工作状态:
3-1-1 ESD保护二极管反向击穿电压(VBR)是否充分高于被保护信号线的振幅(最大电压)
3-1-2 ESD保护二极管总电容(CT)相对于受保护信号线的频率是否足够低
3-1-3 信号极性(即信号电压是否像模拟信号一样跨GND电位)
ESD事件保护主要特性
当静电放电(ESD)进入系统时,ESD保护二极管要么导通,要么反向击穿。单向ESD保护二极管通过正ESD电击时反向击穿,负ESD电击时导通吸收ESD能量。防止ESD脉冲损坏被保护器件(DUP),需要注意以下三点:
3-2-1 低动态电阻(RDYN)
3-2-2 低钳位电压(VC)和第一峰值电压
3-2-3 ESD保护二极管吸收不同极性ESD脉冲工作原理