Hi,

So I have seen a few guides from manufacturers(such as https://www.infineon.com/dgdl/an-1024.pdf?fileId=5546d462533600a401535591115e0f6d) which show me how to calculate inductance and core size and such for me to MAKE my own transformer. At this point intime it is much more realistic for me to be choosing off the shelf component.

The issue I am having starts with the fact that transformer manufacturers' datasheets only list inductance/leakage inductance/ saturation current.

Then ontop of this I have read many things about transformers but they all are really surface level. I am at the point where I am wanting to know WHY inductance/leakage inductance/ saturation current matter and how they affect the way a flyback operates. For example the above link show me how to calculate primary inductance but does not explain why it should be that and what would happen if I stray from that value.

I know this is a large question but I feel like I know less the more I look stuff up.

So does anyone have any links to guides/tutorials/application notes that explains why the characteristics (inductance/leakage inductance/ saturation current) matter because that is the most that transformer data sheets provide.

Also is the effects of things like flux density not incorporated into the other transformer characteristics that are listed in data sheets (such as flux density just is what determines leakage inductance or whatever)

Sorry if this sounds dumb it is just not clicking for me and the stuff I have been reading aren't explaining what I need to hear(still looking tho)

(to complete this mess of a post I am using 750871110 with top257/top224 and it is being unreliable but I already made a post about that and need to take a step back yes I have already read https://www.allaboutcircuits.com/te...chpt-9/practical-considerations-transformers/ and I need more depth)

thank you all

So I have seen a few guides from manufacturers(such as https://www.infineon.com/dgdl/an-1024.pdf?fileId=5546d462533600a401535591115e0f6d) which show me how to calculate inductance and core size and such for me to MAKE my own transformer. At this point intime it is much more realistic for me to be choosing off the shelf component.

The issue I am having starts with the fact that transformer manufacturers' datasheets only list inductance/leakage inductance/ saturation current.

Then ontop of this I have read many things about transformers but they all are really surface level. I am at the point where I am wanting to know WHY inductance/leakage inductance/ saturation current matter and how they affect the way a flyback operates. For example the above link show me how to calculate primary inductance but does not explain why it should be that and what would happen if I stray from that value.

I know this is a large question but I feel like I know less the more I look stuff up.

So does anyone have any links to guides/tutorials/application notes that explains why the characteristics (inductance/leakage inductance/ saturation current) matter because that is the most that transformer data sheets provide.

Also is the effects of things like flux density not incorporated into the other transformer characteristics that are listed in data sheets (such as flux density just is what determines leakage inductance or whatever)

Sorry if this sounds dumb it is just not clicking for me and the stuff I have been reading aren't explaining what I need to hear(still looking tho)

(to complete this mess of a post I am using 750871110 with top257/top224 and it is being unreliable but I already made a post about that and need to take a step back yes I have already read https://www.allaboutcircuits.com/te...chpt-9/practical-considerations-transformers/ and I need more depth)

thank you all

Last edited: