Michael: The ADuM1310 inputs have ESD diodes that connect internally to VDD which provides a path to power up the ADuM1310 when the VDD pin is open externally from the MOSFET switch. It may be best to add the external logic with tristate output to the…
Hello Alex,
The ADuM1310 and the 74HC04 have similar drive strengths on the output. This means that if you run the MOSFETs on the outputs directly, you should see comparable results. One way to read the drive strengths is to look at the Voh and Vol levels…
Hello Tomek,
Can you provide a diagram showing basic connection of the DC/DC and ADuM1310s, and which pins you're protecting with the TVS devices?
Regards,
DaveC
若采用两线制24V电流环，就不能使用光耦，光耦消耗电流太大，在AD421的datasheet上采用ADuM1310隔离。
Hi Leonfun, I am not sure I understand your comment but I will reply as best I can. First identify the hazards. If the hazard can then somehow be addressed using a circuit that looks something like a sensor+logic+actuator then you are talking about functional…
附件是我的电路图，请问电路图是否有问题，另隔离我用的磁耦ADUM1310，场效应管我用的DN2540，买来DS用万用表测量是通的，放电后DS脚阻值5百多，按理应该是好的？但是我的结果不多，240欧姆的电阻早上是10V，刚刚又没有了，而且AD421开始发热，有点烫，我的问题主要是1.电路图是否有问题 2.场效应管是否是好的？如果有做过的是否可以上传原理图给我参考？谢谢谢谢！
Hi Jelelnie
Thanks for your reply.
Unfortunately, I can't show you circuit diagrams as they will reveal sensitive company information, and I haven't got authority to do that. What I can tell you is, that through a header with SPI signals and…
在此次研讨会上，工程师朋友就会议中的内容提出了不少问题，ADI亚洲技术支持中心的专家团队提供了专业解答，我们整理其中部分技术问答分享给大家，供参考学习哦
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问下AD740X的封装是多大的
16pin SOIC封装，也有8pin的
哪些部分需要隔离?
对于220V以上系统，功率PWM信号，相电流检测信号，用户IO信号等需要隔离
问题：电流环路的电源是不是必须和系统的供电电源分开？
答案：是的，下图是AD421的电流环路示范，电流的环路必须是浮地，否则电流环路将无法形成。
问题：数据手册中提供的FET管很难买到，有没有其他的能替代呢？
答案：AD421对FET管的需求如下图。
您可以参考FET管的数据手册，只要上面几个参数符合要求的都可以替换。您也可以参考下面的表格：