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???
02/23/10 16:56
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 		 #173477 - No, you have it exactly the wrong way around!
Responding to: ???'s previous message
Kiran V. Sutar said:
If there is an in-rush current

There is no "if" about it; there will be an inrush current - the object of the exercise is to limit that current.

I missing on a lot of things here.

Indeed - hence you are wise to opt for a ready-made unit.

I need to go deeper into this. Can you please explain why an NTC ?

Think about it: when does the "inrush" occur? what causes it?

Is the NTC used as "Surge Current Killer" (as the datasheet says)?

Yes, of course - that is precisely why the datasheet says it!

Never saw or heard of Thermistor being used for SMPS.

As already noted, it is a very long-established and well-known technique for limiting startup current surges in any application!



List of 26 messages in thread
TopicAuthorDate
Current Rating of Thermistor/Inductor            01/01/70 00:00      
   NTC or PTC ?            01/01/70 00:00      
      Thanks Andy            01/01/70 00:00      
         PTC.            01/01/70 00:00      
            How will a thermistor LIMIT inrush current ?            01/01/70 00:00      
         SCR dI/dt limiting            01/01/70 00:00      
            Magic bit            01/01/70 00:00      
            Rule 8 comes from here...            01/01/70 00:00      
         RE: I never read anything about this            01/01/70 00:00      
         There are many types of "thermistor"            01/01/70 00:00      
   Thanks Steve and Andy            01/01/70 00:00      
      That's probably the safest route            01/01/70 00:00      
   SCK NTC series...            01/01/70 00:00      
      That's probably not a good idea, unless...            01/01/70 00:00      
      Thanks Kai...            01/01/70 00:00      
         No, you have it exactly the wrong way around!            01/01/70 00:00      
            Would any other NTC do the job..?            01/01/70 00:00      
            Hint: cause of "inrush"            01/01/70 00:00      
               The great White light NOW struck me !!!            01/01/70 00:00      
         NTC versus PTC...            01/01/70 00:00      
            NTC or PTC?            01/01/70 00:00      
               Or by other words...            01/01/70 00:00      
                  Is that really true?            01/01/70 00:00      
                     What I meant...            01/01/70 00:00      
                        It's all about conserving energy            01/01/70 00:00      
   An informative link for In-rush current            01/01/70 00:00      

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