Help needed

Discussion in 'General Electronics Chat' started by nepdeep, Sep 28, 2012.

  1. nepdeep

    Thread Starter Member

    Sep 14, 2011
    139
    0
    Hi there I am electrical student and have a challenging project. I need to build a load step that works on low voltage as much as 0.9 V, gives current more than 20 A and slew rate is adjustable(min 5A/us). I have about two weeks to finish.

    P.S. If someone can provide me the document with the design diagram, would be lifetime help to me. Thanks in advance, to all good people on earth. Help me !!
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    This is well strictly speaking homework. Have you done any work so far. That you can show us
     
  3. nepdeep

    Thread Starter Member

    Sep 14, 2011
    139
    0
    hello there...thanks for the comment but was not homework on the first place. Secondly, this is the list of things i tired so far

    Use MOSFET as the load and control it to use it as current source under the constant voltage.
    Provide the wave signal to the input of MOSFET driver.
    the most important and problematic thing is with slew rate control.
    is simple thing but got stuck there...
    and yes the slew srate should be higher than 5A/us..

    can you may be help me now please..?!!
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,974
    3,220
    Suggestions:

    Use an op amp with a MOSFET to generate a controllable constant current such as this (you can use other op amps such as a single supply type).

    To control slew rate, you can use an op amp integrator.
     
    nepdeep likes this.
Loading...