??? 02/23/10 20:03 Read: times |
#173494 - NTC versus PTC... Responding to: ???'s previous message |
Kiran said:
But as Steve and Andy mentioned, the diagram shows that it is an NTC, whereas shouldn't that be a PTC ? It's a bit confusing, both NTCs and PTCs are recommended for limiting of inrush currents sometimes. But what you need is definitely a NTC. Best you study this following link by yourself. Hit on "data sheets" on the right of "NTC inrush current limiters" and you will find many useful information on how it works and how to find out the right part for your application: http://www.epcos.com/web/gener...le=en.html The idea of NTC in your application is to limit the inrush current flowing immediately after connecting your power supply to mains. Remember, there is a cap somewhere at the input of your circuitry, which presents a short circuit to mains, when being uncharged. Without the inrush current limiter, components can get damaged or at least the fuse(s) will break. But make no mistake, the inrush current is still rather high, even with NTC. It's only to blunt the point a bit... Kai Klaas |