+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Newbie level 2
    Points: 20, Level: 1

    Join Date
    Jul 2016
    Posts
    2
    Helped
    0 / 0
    Points
    20
    Level
    1

    How to solve time step too small in LTSPICE?

    Hi,

    I am currently trying to simualte a GaN E-HEMT Half Bridge in LTSPICE (schematic can be found here http://gansystems.com/evaluationboar...2015-10-20.pdf), but the simulation is not working due to a step size too small error. Does anyone know how can I simulate this circuit? All the required files are attached.

    Thank you

    circ_files.rar

    •   AltAdvertisement

        
       

  2. #2
    Super Moderator
    Points: 51,877, Level: 55
    Achievements:
    7 years registered
    erikl's Avatar
    Join Date
    Sep 2008
    Location
    Germany
    Posts
    8,090
    Helped
    2666 / 2666
    Points
    51,877
    Level
    55

    Re: How to solve time step too small in LTSPICE?

    Quote Originally Posted by lklopes View Post
    circ_files.rar:Draft4.log: Could not converge to DC with sources off!
    Seems there is no supply or there are no stimuli?



    •   AltAdvertisement

        
       

  3. #3
    Newbie level 2
    Points: 20, Level: 1

    Join Date
    Jul 2016
    Posts
    2
    Helped
    0 / 0
    Points
    20
    Level
    1

    Re: How to solve time step too small in LTSPICE?

    For me, the following error appears:
    Analysis: Time step too small; time=4.88218e-012, timestep=1.25e-019: trouble with u1:led:lednor-instance d:u1:led:led



    •   AltAdvertisement

        
       

  4. #4
    Super Moderator
    Points: 52,882, Level: 56

    Join Date
    Apr 2011
    Location
    Minneapolis, Minnesota, USA
    Posts
    12,938
    Helped
    2578 / 2578
    Points
    52,882
    Level
    56

    Re: How to solve time step too small in LTSPICE?

    Try setting a timestep which creates 50-500 steps within one cycle of the frequency which your circuit is designed to work at.

    Example, if your circuit works at 1,000 Hz, try a timestep of 1/100,000 second.



--[[ ]]--