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TVS管和ESD管的技术指标和选型指南-嘉立创推荐
2022-07-05 23:06:00 【ltqshs】
TVS管和ESD管的技术指标和选型指南
瞬态电压抑制器简称TVS,是一种二极管形式的高效能保护器件。当TVS二极管的两极受到反向瞬态高能量冲击时,它将其两极间的高阻抗变为低阻抗,吸收高达数千瓦的浪涌功率,使两极间的电压箝位于一个预定值,有效地保护电子线路中的精密元器件,免受各种浪涌脉冲的损坏。由于它具有响应时间快、瞬态功率大、漏电流低、击穿电压偏差小、箝位电压较易控制、无损坏极限、体积小等优点。
ESD静电保护管是一种常用性的过压、静电保护元件,保护电子设备中敏感电路免遭静电影响。ESD静电保护管并联于电路中,当电路正常运作时,ESD静电保护管处于高阻态,不影响线路正常工作;当电路出现异常过压并击穿电压时,迅速由高阻态转为低阻态,给予瞬间电流提供阻抗导通路径,把异常电压箝制在一个安全的水平,从而保护被保护IC或线路。
技术指标
Ipp:最大反向峰值电流,这个值越大,产品性能越好。
[email protected]:钳位电压,达到最大电流Ipp时的钳位电压值。
Vrwm:最大方向工作电压,被保护的信号,其正常工作时的电压不能超过这个电压。
Vbr:反向击穿电压,当反向电压超过这个值时,反向电流会急剧增加。
Cj:结电容,一般是pF级别,用在高速信号线上,比如USB2.0的D+和D-。
Ppp:测试出来的最大Ipp乘以此时的钳位电压Vc。
选型指南
Vrwm不得小于被保护信号的工作电压。从减少漏电的角度考虑,Vrwm比保护信号的工作电压越大,漏电流越小。从保护强度的角度考虑,Vrwm越接近信号工作电压,管子的钳位电压Vc越低,对信号的保护作用越好。
ESD管和TVS管的防护等级要大于产品本身要求的防护等级。ESD管和TVS管的静电钳位电压、浪涌钳位电压越低越好。管子的保护性能主要跟钳位电压有关。
TVS管的功率要求:假设要通过200V的浪涌,要求钳位电压是20V以内,浪涌测试仪的内阻是2Ω,所以最大输出电流是(200V-20V)/2Ω=90A,则要选择管子功率在90A*20V=1800W功率以上。如果这个TVS管的钳位电压小于20V,对功率的要求会低一些。
省流:先看Vrwm反向工作电压,再看Vc钳位电压,然后看Ppp峰值脉冲功率。
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