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Thread: Ripple Current, primary Capacitor, 105°C vs. 85°C.

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    Default Ripple Current, primary Capacitor, 105°C vs. 85°C.

    Hi

    I've looked some primary capacitors up and found out that 85°C Capacitors allow a much higher ripple current.
    Link, Nippon CHemicon as an example:
    http://www.chemi-con.co.jp/cgi-bin/C...90&a8=390&s=14

    And can I compare the rated ripple current ratings mentioned on this site?

    Can I use 105°C cap with less temperature but higher ripple current than mentioned in the datasheet? Is there a temperature coefficient for ripple?
    Or do I have to take those values as is and the 85°C types are indeed better in this regard and allow higher ripple current?

    The best thing I could find about this:
    al-technote-e-161001.pdf
    Quote Originally Posted by al-technote-e-161001.pdf
    There are some products that can accept a higher ripple current than the rated value providing that ambient temperature Tx is lower than the upper limit of the category temperature range.
    Are the primary bulk caps one of those? or not?


    And the E-cap_2011.pdf does list a temperature coefficient for ripple, but only for select series (ie: SE, SE-K, SZ and 4 others, not for the rest)...

    Do you know more about this? ANd have some documents that prove what's possible and what not?

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    Default

    scnr: Am I allowed to answer?

    Just kidding, I'll wait for other replies. We'll see.

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    Default

    It depends on if it is japanese or not.

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    Default

    There are coefficients for temperature and frequency.

    Scroll down to page 22: http://www.nichicon.co.jp/english/pr...f/aluminum.pdf

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    Default

    Thanks Jonny.
    But that isn't really much.

    How do you compare the Ripple Current of 105°C types to the Ripple Current of 85°C Types? Especially if the manufacturer doesn't state any temperature coefficient...

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    Default

    You really need to compare specification's of each capacitor. The temperature rating isn't an indication of ripple current rating.

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    Yes but what do I do if there is no temperature coefficient or multiplier for lower temperatures for certain types? The linked Nippon CHemicon are a prime example because there is no such info listed...

    Do I take the value and take it as is because Nippon CHemicon doesn't want this cap to be used over the specified ripplecurrent or what do I do?

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    Default

    You need to ask for the correct documents. They don't always put them online. Typically you have to contact the vendor.

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