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How to interpret SOA graphs?

Discussion in 'Electronic Design' started by Wong Sy Ming, Jul 16, 2003.

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  1. Wong Sy Ming

    Wong Sy Ming Guest

    I'm looking to run some NTY100N10 devices in linear mode for the pass
    element in a DC power supply, but it seems that these devices have a very
    poor power dissipation capability? Or do I not know how to interpret the SOA
    graph?
     
  2. Ted Wilson

    Ted Wilson Guest

    The ratings shown on the graph are for the device on its own, without any
    form of heatsink. (6W with a theta j-a of 25 deg C gives a junction temp
    rise of 150C).

    Depending on the size of heatsink you're prepared to use, you can squeeze
    considerably more out of it.

    Regards

    Ted Wilson
     
  3. Ted Wilson

    Ted Wilson Guest

    Hi

    The question was specifically about power consumption, as opposed to SOA in
    general.

    I'm puzzled by your reference to current crowding at high voltage. This
    seems to be an allusion to the phenomenon that occurs in bipolars causing
    'second breakdown'. This doesn't occur in power mosfets, due to the ptc of
    Rd-s on.

    If there's omething else goes on, I'm interested to hear about it.

    Regards

    Ted Wilson
     
  4. mike

    mike Guest

    Sorry, I read the Subject line and interpreted that to mean you were
    asking "How to interpret SOA graphs?". My mistake.

    mike


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