齐纳二极管

齐纳二极管的特点是能够保护对象免受瞬态过压脉冲以及接近直流的过压脉冲的影响,ESD保护二极管很难做到这一点。
在设备电源线中,当电路开关时,可能会产生长达几毫秒的长脉冲宽度开关浪涌。齐纳二极管将保护半导体器件免受开关浪涌和频率接近直流的过压的影响。它还可以保护半导体器件免受宽度为几百纳秒的静电放电[2]和脉冲宽度为微秒量级的感应雷电浪涌[1] 的影响。这有助于提高设备的可靠性。
齐纳二极管具有从5.6V到82V的各种齐纳电压规格,其广泛的应用领域包括消费电子和工业电子产品。

[1] @IEC61000-4-5,tp=8/20μs
[2] @IEC61000-4-2

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参考设计

多路复用器电路PCB照片示例
使用共漏极MOSFET的电源多路复用器电路
此参考设计中,在一个小型印刷电路板(PCB)上实现了具有2个输入和1个输出的电源多路复用器电路。我们现已在已开发的电源多路复用器电路参考设计中增加了使用共漏极MOSFET的应用电路。这些参考电路通过组合东芝多种产品线中的MOSFET栅极驱动IC和齐纳二极管等最佳器件,可以实现BBM和MBB模式的切换。
使用共漏极MOSFET的电源多路复用器电路
电源多路复用器电路PCB照片示例
电源多路复用器电路
在此参考设计中,在一个小型印刷电路板(PCB)上实现了具有2个输入和1个输出的电源多路复用器电路。将从东芝的多种产品线选择的MOSFET栅极驱动电路IC、eFuse IC、齐纳二极管和小型封装MOSFET等器件进行组合,实现具有BBM和MBB开关的理想二极管。
电源多路复用器电路 / 2输入和1输出

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