I wasn't refering to SMPS, but wanted to explain, how PTCs manufactured for limiting of inrush currents do their job.

In this post

http://www.8052.com/forumchat/read/173494

I already stated, that in combination with a SMPS only a NTC will work!


For a newbie it's very confusing to see, that NTCs and PTCs are manufactured to limit inrush currents.

If you open this link

http://www.epcos.com/web/gener...le=en.html

you will see, that there are not only NTCs for limiting of inrush currents, but also PTCs. Of course, they do work entirely different.

In this link

http://www.epcos.com/web/gener...nnotes.pdf

a typical example of a PTC for limiting of inrush currents is shown:



As I said before, not the height of inrush current is limited here, but its duration.

Kai Klaas