I am reading a transformer design white paper which states that a push-pull transformer should be designed for a frequency of half the switching frequency. Eg, if my switches are running at 100kHz, the transformer frequency is 50kHz. Does this make sense? Personally, I would understand that although each primary winding is driven by one switch at 50kHz, the combined effect would be energy delivery at 100kHz. Am I wrong, and why? Thanks!