I've wound a 5:54 turn transformer. I'm feeding it small voltage pulses in the input, but it seems like on the output, it "struggles" to achieve the output voltage (ie, it doesn't give me square voltage pulses). In the following photos, in green is the transformer voltage in the input and output for your reference.
The load added to the secondary is a resistor, although I've tried having it open circuited and the voltage response is similar. I've also tried using litz wire to see if it helps to output square voltage on the high side, to no results. Does anyone have any idea what might be causing this?
EDIT: Green traces are transformer voltage (primary, then secondary on second photo), and blue is the respective current going in/out of the transformer (primary then secondary again). Apologies yellow and purple are irrelevant to this question. The transformer is an RM12 core, with 24:5:24 turns (sec/prim/sec), so fully interleaved 5:54 transformer.