ST ST7FDALIF2M6TR

A high-efficiency, high power factor, low THD and digital dimming electronic ballast designed to drive 2X36 W T8 tube lamps. The system consists of three main blocks: The high-frequency ballast includes an active power factor correction circuit based on the L6562 for universal input voltage as well as a ballast control circuit based on the L6574. The digital dimming is performed by interfacing the ST7FDALI microcontroller with the analog half-bridge driver. The DALI control unit is dedicated to address the slaves, to display the lamp status and to send the dimming commands. This unit is provided with a keyboard which allows setting different dimming scenes over a wide range (5 - 100%) as well as putting in standby and restarting the ballast. The DALI communication protocol includes single and group mode, as well as broadcast mode to address the slaves. The AC-DC adapter is based on the VIPer12A-E. This is an offline double-output isolated power supply in DCM flyback configuration. The outputs are set for 20 V to supply the communication bus and for 5 V to supply the MASTER microcontroller.

• High efficiency, high power factor, low THD
• Digital dimming support, dimming range 5–100%
• DALI control unit with single, group, and broadcast mode support
• Standby and restart functions
• AC-DC adapter with dual output (20V and 5V)

• Lighting system for driving 2×36W T8 fluorescent tubes