Re: gEDA-user: Schottky diode?

[al davis <ad106@xxxxxxxxxxxxxxxx>]

On Tuesday 17 October 2006 15:59, John Coppens wrote:
> I was (trying to) simulate a switching power supply,

A warning ...  ngspice has some problems with its step size 
control that sometimes gives wrong results, particularly on 
circuits like switch mode power supplies.  The problem is shows 
with circuits that switch between two very different time 
constants, requiring a sudden change of internal step size.  
Often, it will just slip by, with no indication that anything 
is wrong, giving believable but incorrect results.

gnucap 0.34 had a similar problem, but would usually report 
nonconvergence instead.  Since it used the same algorithm that 
would be expected.  0.35 has it partially fixed, but not all 
devices that can be switches have the complete fix.

Why don't you try gnucap?  At least if it does have a problem I 
can help you with it.  You can provide a great service by 
exposing problems like this.


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