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capacitor datasheet? ripple current ? Impedance ratio?

Discussion in 'Electronic Basics' started by [email protected], Oct 20, 2006.

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  1. Guest

    I 'm a bit confused with the math of ripple curent after reading the 2
    different datasheets .
    Capacitor A is 640mA at 100kHz and Capacitor B is 146mA at 120Hz.

    So What is the ripple current for Capacitor B at 100kHz?
    Which one has a higher ripple current?

    Also, some of the miniature capacitor datasheets don't list the
    Impedance or ESR , and only Impedance ratio is listed.
    Is there any way to find out the impedance?
    *******************************************************

    Capacitor A: Rated ripple current(mA/rms 105c,100kHz): 640

    Capacitor B: Rated ripple current(mA/rms at 120 Hz,105°C): 146
    Frequency Multipliers: 1.20 For 10K Freq.(Hz)
     
  2. Phil Allison

    Phil Allison Guest

    ** Desperate Groper Alert !


    I 'm a bit confused with the math of ripple curent after reading the 2
    different datasheets .
    Capacitor A is 640mA at 100kHz and Capacitor B is 146mA at 120Hz.

    So What is the ripple current for Capacitor B at 100kHz?
    Which one has a higher ripple current?


    ** Mary has 3 apples and Johnny has five.

    How much older is Mary than Johnny ??

    Get it now - fuckhead ?



    Also, some of the miniature capacitor datasheets don't list the
    Impedance or ESR , and only Impedance ratio is listed.
    Is there any way to find out the impedance?


    ** Buy one, measure it yourself.


    What a PITA cretin .....




    ....... Phil
     
  3. Eeyore

    Eeyore Guest

    Almost certainly ( 99.99% certaintly ) it isn't intended for use @ 100kHz.


    At what frequency ?

    [email protected] is data supplied for capacitors intended for use as the output
    caps on switchmode power supplies.

    Ones rated @ 120 or 100Hz aren't intended for this application.

    Graham
     
  4. I 'm a bit confused with the math of ripple curent after reading the 2
    different datasheets .
    Capacitor A is 640mA at 100kHz and Capacitor B is 146mA at 120Hz.

    What is the application?
     
  5. kell

    kell Guest

    Don't let Phil get to you. You posted a legitimate question on the
    appropriate newsgroup.
     
  6. Phil Allison

    Phil Allison Guest

    ** Worse Fuckwit Groper Alert


    Don't let Phil get to you. You posted a legitimate question on the
    appropriate newsgroup.


    ** The question is asinine.

    And SO are you - fuckhead.




    ......... Phil
     
  7. Guest

    You pathetic idiot.

    It must be awful to have such a pathetic attitude. Can you imagine
    having to swear at the word, just so that you can think that you are
    not as bad as you really are! Must have grown up in the bundu, or must
    have been rejected by your mother. I cannot imagine any person having
    any feelings for such a pathetic lamebrain
     

  8. Thank you for feeding the philtroll. If you people would ignore him
    completely, he would go away to better feeding grounds.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  9. I 'm a bit confused with the math of ripple curent after reading the 2
    different datasheets .
    Capacitor A is 640mA at 100kHz and Capacitor B is 146mA at 120Hz.

    So What is the ripple current for Capacitor B at 100kHz?
    Which one has a higher ripple current?

    Also, some of the miniature capacitor datasheets don't list the
    Impedance or ESR , and only Impedance ratio is listed.
    Is there any way to find out the impedance?
    *******************************************************

    Capacitor A: Rated ripple current(mA/rms 105c,100kHz): 640

    Capacitor B: Rated ripple current(mA/rms at 120 Hz,105°C): 146
    Frequency Multipliers: 1.20 For 10K Freq.(Hz)

    The rule of thumb designers approximation for choosing the size of a
    capacitor:

    C = T(I/Vpp)

    C is in farads
    T is ripple period in seconds
    Vpp is the peak to peak ripple
    I is the load current in amps
     
  10. Phil Allison

    Phil Allison Guest

    "Charles Schuler"


    ** Dunno a thing about cap impedance, ESR or SMPSs - do you ?

    Hint - it when you chose a cap on factors other than its value in uF.




    ........ Phil
     
  11. BobG

    BobG Guest

    Hey Phil... did you used to own any firearms back before they were
    outlawed? I think anyone that lives within driving distance of you is
    probably wondering if they made sure they collected all of them. You
    probably wouldn't get mad enough at some stupid google groups user to
    try to send him to the big Bulletin Board in the sky would you?
     
  12. First, you have to model what you are trying to accomplish assuming that ESR
    = 0. Have you ever designed a circuit?
     
  13. PeteS

    PeteS Guest

    Who?
    ;)
     
  14. John Fields

    John Fields Guest

    ---
    Phil Allison?

    Not such a bad guy...

    Profess to be an authority and make a mistake and he'll surely cut
    you down. What's wrong with that?

    Ask a question after you've done a reasonable amount of homework and
    he'll generally put you on the right track. What's wrong with that?

    Expect to be coddled because you're stupid? There's a lot wrong
    with that.
     
  15. Phil Allison

    Phil Allison Guest

    "Charles Schuler"

    ** Then you forget that damn silly idea because ESR never = 0.


    ** Dunno a thing about cap impedance, ESR or SMPSs - do you ?

    Hint - it when you chose a cap on factors other than its value in uF.


    When are you gonna learn to read?




    ........ Phil
     
  16. Martin

    Martin Guest

    Ummm ...
    This is sci.electronics.BASICS ... where else should the stupid go to
    be coddled in matters of electronics, is there another newsgroup
    sci.electronics.really.really.basic.for.idiots.only or something.

    I understand coming down on a poster trying to cheat on homework, or
    that is unwilling to learn when pointed at further information about
    the subject.

    But Phil's tolerance level is way off, and the nastyness of his
    responses is usually WAY out proportion to the level of anything in
    what he is responding to.

    Do YOU feel the OPs post was deserving of being called a desperate
    groper, a fuckhead, and a PITA cretin.
    I'll conditionally give him groper (but not desperate groper) but the
    rest of it was just totally out of line


    Martin
     
  17. Of course not. When designing one usually starts with a first approximation
    to determine the size of the capacitor that will be needed. Then one
    consults manufacturers' data to determine cost, physical size, etc. Then
    one selects a capacitor and uses its ESR (and perhaps other information) in
    a second approximation to determine if the ripple is still within tolerance
    and to calculate heat dissipation in the capacitor and subsequently the
    expected temperature rise of the capacitor in the application. Several
    iterations of selection/calculation might be required to pick the best
    capacitor (within the budgets of cost and size).

    You are rather abusive, by the way, which tells me that you are deficient in
    terms of knowledge and experience.
     
  18. Well said Martin ... you have spoken for many of us. Banish that abusive
    monster to science.electronics.design where he will meet many of his ilk.
     
  19. Phil Allison

    Phil Allison Guest

    "Charles Schuler"

    ** Read the OP's question - for god's sake.

    He did NOT want to know about cap value.

    Your formula has NOTHING do with the posted question.

    YOU dunno a thing about cap impedance, ESR or SMPSs - do you ?

    Hint - it when you chose a cap on factors other than its value in uF.

    When are you gonna learn to read ?


    ( snip more of this cretin's irrelevant drivel)



    ** For someone who cannot even comprehend a simple question or my criticism
    of your reply - that is very funny.

    YOU are just another wanker with NOTHING to say.

    Go drop dead - shithead.



    ......... Phil
     
  20. Gee Phil, you are amazingly disgusting. I responded as I did to the OP
    because I felt that his question suggested that he was floundering about as
    to capacitor selection. I was trying to be helpful ... if I was not, then
    the OP simply can choose to ignore my response, or respond from his point of
    view. Who are you to criticize my response? His agent? A forum cop? God?

    I could easily kick your sorry arse with all kinds of slurs, but actually
    feel sorry for you (and will never get down into the slime with your ilk).
    However, I will say goodbye with a big PLONK! Folks who have nothing to
    offer but acrimony are simply ego feeders.
     
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