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NTC thermistor problem

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RITESH KAKKAR

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Hello,
What is NTC 10D-9 mean on it cover name?
and what it is used in series with AC to DC conver SMPS 12V 2A
 

I've seen this piece in input . This piece is to prevent inrush current to charge capacitors when you plug SMPS to AC this NTC will work and then jumper by a switch.
 
what will happen if we will not use it?

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Here is the picture
 

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This is also a kind of resistance. But when an electric current passes through it, its resistance drops. Thus the voltage drop does not occur. If you refer to it's datasheet,you will see that it is related to its resistance at 25 °(in this type 100ohm) and its size(D-9).
 
what is D-9 mm??
can't we use direct 100ohm resistance?
 

RITESH KAKKAR said:
can't we use direct 100ohm resistance?
Click to expand...
As stated by others in previous posts, the NTC is different than the use of 100 ohm resistance because when it is cold(at the beginning) has a big resistance, and when it is hot has low resistance.
 

ok, that i know negative temperature coefficient but why we prefer it in smps design?

what does D9 mean?
 

RITESH KAKKAR said:
ok, that i know negative temperature coefficient but why we prefer it in smps design?
Click to expand...

As previously stated we need a resistance to prevent inrush current, but after the connecting, a resistance will cause voltage drop. Ntc use for this purpose.
 
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