aha, i see.
Classic flamable fuse gets its wire red hot and it melts. Thats slow and the ic will burn before that happens.
Ptc fuses arent really fuses, the name is just confusing. The current passing through has to change molecular structure inside, thats even slower. Ptc usually work at 150% rating for 2 hours or 150% rating for 30 mins, thats their role, fit a place where a fuse cannot be allowed to blow, like your airplane or life keeping devices. But in reaction time not woth the name of fuse.
Now you see these arent the things fast enough for this. Only a schottky diode fast reverse time of 5ns is fast to do it, or other complicated electronic fuse circuits perhaps or hardcore clamps. These have a chance at least. But classic fuse or ptc, i dont thik of them as really options for uC or any IC protection.
Classic flamable fuse gets its wire red hot and it melts. Thats slow and the ic will burn before that happens.
Ptc fuses arent really fuses, the name is just confusing. The current passing through has to change molecular structure inside, thats even slower. Ptc usually work at 150% rating for 2 hours or 150% rating for 30 mins, thats their role, fit a place where a fuse cannot be allowed to blow, like your airplane or life keeping devices. But in reaction time not woth the name of fuse.
Now you see these arent the things fast enough for this. Only a schottky diode fast reverse time of 5ns is fast to do it, or other complicated electronic fuse circuits perhaps or hardcore clamps. These have a chance at least. But classic fuse or ptc, i dont thik of them as really options for uC or any IC protection.
