This application note describes a demonstration board able to drive 2 x 58 W linear T8 fluorescent tubes. The last section of the document describes the changes that need to be made to adapt the same board for 2 x 36 W linear T8 fluorescent tubes. The ballast is controlled by the new L6585DE IC that integrates the PFC and half-bridge control circuits, relevant drivers, and the circuitry that manages all the operating phases (preheating, ignition and run mode) of the lamp. Protections against failures such as lamp disconnection, anti-capacitive mode and PFC overvoltage are guaranteed and obtained with a minimum number of external components.
The document details an electronic ballast solution based on the STEVAL-ILBO07V1 demonstration board, designed to drive two 58 W linear T8 fluorescent lamps. The circuit utilizes the L6585DE integrated circuit, which combines PFC and half-bridge control functions to manage preheating, ignition, and run modes efficiently.
The note provides a comprehensive guide on adapting this design for different lamp powers (specifically 36 W) and includes detailed sections on component selection, circuit topology (lamp-to-ground configuration), protection mechanisms, and experimental results regarding start-up sequences and conducted emissions.
| Input voltage range | 85 to 265 Vac |
|---|---|
| Line frequency | 50/60 Hz |
| Number of lamps | 2 |
| Lamp type and configuration | T8 in parallel configuration |
| Power per lamp | 58 W |
| Power factor | 0.9 |
| Total harmonic distortion | 10% |
| Efficiency | 90% |
The ballast is controlled by the L6585DE IC.
It is designed to drive 2 x 58 W linear T8 fluorescent tubes.
Yes, the document describes changes needed to adapt the board for 2 x 36 W linear T8 fluorescent tubes.