Low Voltage Zener

Discussion in 'General Electronics Chat' started by Robert.Adams, Sep 6, 2011.

  1. Robert.Adams

    Thread Starter Active Member

    Feb 16, 2010
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    5
    Is there a device that could act something like a 200-300mV zener? I have a design that has a node that is voltage controlled by a transistor to be 5V + Vbe and I need to bump it up by about the amount mentioned.

    If I try to cascade Vbe's I can accidentally turn on a different part of the circuit so I'm looking for something in the low range I mentioned above.

    Thanks!
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,535
    Nope, but a germanium diode drops approximately 0.3V.

    Usually voltage dividers are used.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. Robert.Adams

    Thread Starter Active Member

    Feb 16, 2010
    112
    5
    Ah, I shall look into those ideas.

    A voltage divider isn't plausible since the node is in the middle of a discrete current source/sink configuration. The current is PWM controlled and a clamp makes sure the voltage does not exceed a certain value.
     
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