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  1. #1
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    too hot if irrush current without NTC

    In my circuit using just NTC (norelay) to limit irrush current into a toroid transformer, the issue is NTC is too hot 150 degree. Is it OK for long term use? Or I must use a by pass relay.

    •   Alt13th June 2018, 10:59

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  2. #2
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    Re: too hot if irrush current without NTC

    Hi,

    An NTC needs to become hot to properly work as inrush current limiter.
    Whether 150C is OK or not you should find in its datasheet.

    For my taste: I dont like to have a part in my developed devices that gets that hot at normal condition.

    Klaus
    Please dont contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



    •   Alt13th June 2018, 12:17

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  3. #3
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    Re: too hot if irrush current without NTC

    Ideally - have the inrush NTC on long leads so that the solder joints do not degrade over time from over temp - this is quite a common fault on many psu's ...


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