Converter In-Rush Thermistors etc, UPDATE -4
UPDATE on 17 Nov, Update 2 on 22 Nov, Update 3 on 16 Jan 14, Update 4 on 19 Oct 14. --------------- In a recent thread there was mention of how you can wreck your gizmo (in my case a converter) ...
Forum Discussion
The reason for looking at the smaller thermistor is because it has no, or very little ceramic material surrounding it. The thermistor that we're dealing with has a time constant of 134 s. It's slower due to the attached mass. Still, the small bead thermistor has a sizable time constant.
I could go on with this discussion, but it's really a moot point that we're arguing. The turn-on surge current is not the problem! Regardless if we're using a 2 ohm or 5 ohm device, the energy dissipated in the thermistor is only 35J. The part fails at 1200J. It isn't failing during turn-on. Your argument that the 5 ohm part is better during turn-on is not valid. That is not the problem.
Sal
I could go on with this discussion, but it's really a moot point that we're arguing. The turn-on surge current is not the problem! Regardless if we're using a 2 ohm or 5 ohm device, the energy dissipated in the thermistor is only 35J. The part fails at 1200J. It isn't failing during turn-on. Your argument that the 5 ohm part is better during turn-on is not valid. That is not the problem.
Sal
