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Design of SMPS - Not sure what these spikes are being caused by.
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Zog:
Thanks for clearing that up magic.
I removed the previous post because it was a silly mistake on my part.
I figured that little problem out and didn't want to clutter up the forum.
Zog:
Having trouble stepping the output load in LTspice

Not sure what I am doing wrong but I want to be able to step the load to see the transient analysis.
I have looked all over google and can't find a definitive answer.

I am not sure how or where to set the flagloads option to flag the external current source to be a load.


T3sl4co1l:
Use the PULSE type.  Alternately, use some resistors, a switch and a VPULSE.

Tim
MagicSmoker:

--- Quote from: Zog on August 31, 2019, 10:51:16 pm ---Having trouble stepping the output load in LTspice

--- End quote ---

There's a couple ways to do this, but I like to use a the voltage controlled switch model ("SW") driven by a pulse source.

You need to include a .model statement in your circuit which specifies the relevant parameters for the switch like so:

.model SW SW(Ron=1m Roff=10Meg Vt=4 Vh=-1)

And then drive it with a voltage pulse source that delivers 10V when on, has the rise and fall times you desire, etc.
Zog:
Thank you very much MagicSmoker and Tim,

That was a great way to do what I wanted and by providing the .model example I had it completed in 1/2 Hour.
I don't want to "bless" you all with my appalling Frankenstein of a hack just yet so will show you the bit that did the trick.



Look at that lovely disruption.  :clap:



P.S. I have to thank treez for getting me into LTSpice too. If he had not provided me with a starting point I would never have got anywhere. Everyone needs a "hello world" to get going !




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