What is active clamp flyback?

Download the UCC28780 datasheet
https://www.ti.com/product/ucc28780/datasheet

With technology advances that we almost take for granted, our electronic
devices are becoming smaller.  Naturally we expect this trend to continue. 
We want our screens bigger and battery life longer.  /But/ we’re at a
breaking point. Watch this video to learn about how TI's new active clamp
flyback controller can transform your next AC/DC charger design.

Видео What is active clamp flyback? канала Texas Instruments