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DCDC Push Pull Feedback Compensation calculation

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Echo88:
Is there a simulation tool/calculator/easy way to calculate the needed capacitor/resistor-values which are needed to get a correct feedback compensation in Push-Pull DCDC-topologies?
I found the following document which details the usage of the often used TL431 in the feedback path, but failed to find the described design tool: https://www.onsemi.com/pub/Collateral/TND381-D.PDF
https://www.poweresim.com seems to be a very good tool and also calculates the (quite convoluted) TL431-feedback RC-network, but i cant reproduce the poweresim-results in LTSpice with, for example, an LT1683. Also it seems to only have one optocoupler available and diodes like "PED2A100" which im unable to find datasheets for.

Anyway: Is it absolutely necessary for me to learn poles/zero-calculation before being able to simulate push pull DCDC with well working feedback?

David Hess:
You can find the values empirically.  Or you can use a Bode plot to find the values.  Sometimes where I have unknowns, I have found the values empirically and then used them to work back to a Bode plot of the open loop response which allowed me to calculate the unknown values.

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