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high voltage PNP

Discussion in 'Electronic Components' started by Scott Seidman, Apr 25, 2008.

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  1. I can't seem to find any pnp transistors with a Vce bigger than 500V. I'd
    like one that can go to 1K for use with a current sense. Any pointers??
     
  2. legg

    legg Guest

    Wrong decade, wrong technology. Think of another way.

    If linearity is not required (ie limiting only) think of
    amplitude-triggered communication methods. They aresimpler to develop.

    RL
     
  3. I'm trying to find a bigger transistor to use with the AD8212 High Voltage
    Current Shunt Monitor. Adding the external transistor buys me a common
    mode voltage capablility of Vce, totally braindead, but I can't find
    anything greater than 500V.
     
  4. Joerg

    Joerg Guest

    Looks like the FMMT560 with 500V is pretty much the end of the rope when
    it comes to commonly available parts. The IXTH10P60 goes to 600V but
    it's a (largish and expensive) p-channel FET.
     
  5. legg

    legg Guest

    So you need linearity, huh.....?

    Try sticking your AD8212 output collector's constant current through
    the source of a p-channel fet, with the fet gate on the AD8212
    'common' terminal. I assume you're getting well-decoupled power from
    somewhere to run this thing. That should give current info over the
    fet drain's compliance, if the added capacitance can be suffered at
    the receiving end.

    There are also methods of stringing 'transmitters' in series, with
    their bases (or gates) on a HV divider. Each collector feeds an
    emitter (or source) farther down the resistive divider.

    Being brain dead isn't something you should be aiming to achieve,
    despite what your boss tells you.

    RL
     
  6. legg

    legg Guest

    See a pdf swcadiii model illustrating a sensor using the pnp bipolar
    string on abse.

    RL

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