Flyback controllers are not a specific brand but a category of power supply controllers used in switch-mode power supplies (SMPS). They are commonly produced by various semiconductor companies worldwide, such as Texas Instruments (USA), ON Semiconductor (USA), STMicroelectronics (Switzerland), and Infineon Technologies (Germany). These controllers are widely used in industries like consumer electronics, industrial automation, and telecommunications. Key products include isolated DC-DC converters, AC-DC adapters, and LED drivers. Flyback controllers are valued for their efficiency, compact design, and ability to handle high-voltage applications.