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Diode Characteristics - Average Rectified Forward Current

Discussion in 'Electronic Design' started by firebird, May 16, 2006.

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  1. firebird

    firebird Guest

    Hi, I have a question regarding the typical diode characteristics on
    datasheets from major manufacturers. Most contain characteristics such
    as average rectified forward current (If), peak repetitive reverse
    voltage, peak reverse voltage, forward surge current, repetitive surge
    current, etc...However, I rarely see the conditions under which these
    are obtained. For example, take the average rectified forward current
    - what waveform is this an average of? what is the difference between
    peak reverse voltage and reverse breakdown voltage, if any? I have
    lots of other clarifications I am looking for, but I'll limit my
    inquiry to these for now.

  2. If the diodes are not high speed devices, there is usually a tiny note
    hidden at the bottom that specific that these numbers refer to half
    wave AC line frequency rectification. The surge current usually
    refers to a one half cycle test. The repetitive surge current usually
    refers to the peak current into a capacitive filter (one peak per line
    cycle, but happening many times).
    Usually half wave line frequency, resistive load.
    The peak reverse voltage rating is the highest safe operating
    condition, while the breakdown voltage is something higher where the
    reverse current reaches some danger zone. The second is onset of
    failure, not a safe operating point.
    There are almost infinite variations, so next time, try to bring a
    link to a specific data sheet for us to argue over.
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