The application note discusses the design of a microcontrolled ballast using the ST7 microcontroller.
The aim is to create a flexible ballast that can be used with different tube lamp wattages and types, reducing logistic costs.
The note details the power and digital sections of the ballast, including the use of the ST7LITE0xxx microcontroller, its peripherals, and its control algorithms.
It also explains the different states of the ballast, from initialization to lamp stabilization, and how abnormal conditions such as lamp removal, failure to start, and exceeding maximum values are handled.
The application board and its jumpers for selecting lamp parameters are also described.
The note concludes by mentioning the potential for future implementation of lamp type or power detection.