LM311 querry...

Discussion in 'General Electronics Chat' started by raffter, Apr 8, 2008.

  1. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0
    hello,

    anybody have ideas what STROBING(pin#6) does??? the datasheet shows how its connected but I dont have idea what strobing does to the comparator...:confused:





    Ralph
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The strobe pin allows you to turn off the output stage.
     
  3. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0
    ok thanks!

    but would output be floating??

    and I qoute: from LM311 Texas ins

    "If the strobe is low, the
    output will be in the off state regardless of the
    differential input."

    dont dont what OFF here means.. if floating/disconnected OR just pulled to Gnd or Vee...

    Ralph
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If the strobe is low, the output transistor is in the OFF state; therefore the voltage level will float to whatever might be supplying current.
     
  5. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0
    Ok thanks!

    uhhmmmm...I have pin8(Vcc) to +10V... and tied together pin4(vee) and pin1(GND) to -10V..... I wonder if strobe pin can be pulled low to -10v(by way of 1k resistor).... since pin1 is now referenced to -10V....just asking..

    output pin7 is pulled to +10v through 2k2 resistor(output is taken here).... problem is when I kick-in the strobe(ON), I get an ugly DC before output is finally in "OFF"....

    wait... I will just SIM this one up.. :)

    EDIT: my SIM is funny!! (multisim v8) it WILL simulate BUT NOT the strobe pin...

    Ralph
     
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