I think I figured it out enough to make sense of it. The 1.5 ohms will likely be the normal state and if a short occurs the resistance will quickly rise to the 10 ohms and trip the PTC fuse. That works for me. The reason I was worried a little is that the resistors I use in the circuit range from 5.1 to 10 ohms and that could have caused me some re-design issues.
Thanks,
Dave
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On 11/7/2019 6:46 PM, Dave wrote:
In reference to the part number 1206L010/60 (second one down in top list), I have a question.
Resistance R (min) = 1.5 ohms
Resistance R (1max) = 10 ohms
R min = Minimum resistance of device in initial (un-soldered) state.
Rtyp = No spec given.
R 1max =? Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec.
Question: If I were to figure in the resistance for the PTC fuse as part of my equation for selecting the correct resitors further down the circuit...What number in ohms should I use? In other words, when the circuit is in normal operation, what will the resistance of the PTC actually be?
Thanks,
Dave
