help with electronic question


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  1. #1
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    Default help with electronic question

    Hi guys ,

    would like to confirm with those more knowledgeable on the electronics side of life a problem i am having with looking for an equivalent mosfet for a repair

    The componet is a VN0106N5 which has a signal on the gate of 13.5mhz and is faulty ,

    Looking at the possible replacement for VN0106N5 and the IRF510-512 series came up in searches

    given the input to gate of 13.5mhz gives a 74ns cycle , half a cycle is 37ns

    rise half cycle is = turn on delay time + rise time
    fall half cycle is turn off delay + fall time


    thus spec for IRF510 -513 series says
    max rise turn on delay =20ns
    max rise time =25ns ,
    same for for fall times

    so half cycle rise time is max 45ns , fall half cycle is 45ns , i need a max of 37ns at a freq at 13.5mhz

    thus this equivilant mosfet wont fit this application

    am i correct in my calculations ??


    cheers






  2. #2
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    Default Re: help with electronic question

    Sine waves have predictable shape and timing so rise/fall time (10-90%) can be calculated fairly easy.

    RiseTime = (arcsin(0.8))/(PII*Freq) = ~0.2952/Freq -> ~0.3*Period
    RiseTime = 74ns * 0.3 = ~22ns

    Your FET rise/fall time need to be faster that 22ns.
    Last edited by Gusse; - 18th April 2012 at 20:46.

  3. #3
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    Default Re: help with electronic question

    If you do a google search the device is manufactured by Supertex which has tech support: http://www.supertex.com/contact_app_engineer.html . There are also several sites that show equivelent devices as well as this site which shows who has a supply of the devices: http://www.ic2ic.com/search.jsp?sSea...106N5&prefix=V .

    Best, Ed

  4. #4
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    Default Re: help with electronic question

    thanks guys , will follow up on links and will apply math calcs

    cheers

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