- Joined Nov 10, 2018
Hello, I used this configuration for reverse polarity protection in my new project. The picture is generic downloaded, in my case I used 1.6A FAST fuse and as I had only 1N4003 diodes that can handle 1A each I put two in parallel. I know that low resistors should be connected in series with each diode but the values are so small that I wonder why the wire is not just enough to behave like low resistor. And this is what I did, I connected each anode to negative side through 26awg wires 5cm each. My question is if thermal runaway can happen in the short time that takes the fuse to blow. I am trying also to decipher the graph in the datasheet of the diode about peak surge current and I suspect that one 1N4003 could withstand 2A for one second, I am not sure. (2A/1sec figure is worst case scenario of the fuse I guess). What do you think?
20.8 KB Views: 11