LLC controllers are not a specific brand but a category of industrial controllers, often associated with LLC resonant converters used in power electronics. These controllers are typically produced by various manufacturers worldwide, including companies like Texas Instruments (USA), Infineon Technologies (Germany), and STMicroelectronics (Switzerland). They serve industries such as power supply manufacturing, renewable energy, and industrial automation. Key products include LLC resonant controller ICs, which optimize efficiency in high-frequency power conversion systems. These components are widely available through industrial suppliers like Radwell and Grainger, catering to engineers and technicians in the electrical and electronics sectors.