Hi,
I need help converting a UC3842 in Flyback application Transfer Function from Plant H(s) and Closed Loop G(s) to h(t) and g(t) to do Bode Plots of Gain and determine crossover frequency.
H(s) = Fgo*(1 + (s/Wesrz)) * (1 - (s/Wrhpz)) / (1 + s/Wp1) * (1 / (1 + (s/(Wp2 * Qp)) + (s^2/Wp2^2)))
I would assume we need to convert via Reverse Laplace Transforms?
It would be great to see the steps of the conversion!!!
Thanks,
Werner.
Hi John
Thanks, it's a nice document but it's not what I need.
I have written a design tool for the UC3842 "added flexibility" to speed-up my designs that require Isolated PSU's.
I would like to plot the Gain Margin by using the Transfer Functions, but I can't find any info on how to convert the H(s) terms to h(t) which is needed for Bode Gain Plot
Below is a screenshot of the program, you can see the Gain Plot is wrong but the Phase is correct.
Need a Mathematician
Hi Werner,
The UCC28C4x datasheet, 
has a very detailed section on the control loop design, it may help you.
Regards
Peter
Hi Peter
Thank you very much it does deal with Control Loop Design, it however does not show how to convert the H(s) and Gtotal(s) terms to h(t) and g(t) to draw the plot.
Below is an example of such a conversion on the first term.
I was hoping one of your customers previously requested this converted formula and you could merely pass it on. Seems no one is interested in manually doing the plot..
Keep this thread open, I am working on a solution as I get time and will post updates. Surely every designer should be able to do this plot.
Regards,
Werner.
