I am trying to get general idea of what size of cross-sectional area I would need on a toroidal core to use it as a step-down transformer of a given power rating.
I am aware that the answer depends on frequency. I'm told that as frequency increases, the core-size can decrease and still transfer a given amount of power.
Note: It might be worth noting that I have a very specific need for a transformer in which primary impedance is completely irrelevant. I know most power step-down transformers have a high impedance primary winding to reduce no-load current. But in my case, I am going to use the absolute minimum number of primary windings, because a no-load condition will never occur. My step-down transformer will always be assumed to be 100% loaded. So I want to know how to figure out how big of a toroid I need in order to transfer a given amount of power at a given frequency or frequency range.
As a matter of example, how I would figure out much power the following toroid can transfer when operated at 260 Hz: Amico Toroid Ferrite on Amazon