Dear community,
I'm playing with PTC resettable fuses and i have some trouble.
In effect, i'm not able to retrieve datasheet caracteristics in real life.
My PTC reference : Bourns MF-USML/X Series - MF-USML300/6
Vmax : 6v / Ihold :3.0A / Itrip : 6.0A
My test :
My fuses in serial with 1.7r resistor.
Voltage supply 5.1v >>> Current load about 2.7A.
My result
Each time, after 20-30 sec the fuse break. Second thing, if i try to use it again, the sensibility have been change and break after 2-3sec (same load).
My question... Where is my error
tell me more is you have an idea.