This application note describes a demonstration board able to drive a 4 x 18 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. In addition to the description of the circuit and design criteria, this document provides a short overview of the ballast performances.
The document details an electronic ballast design capable of driving four 18 W T8 linear fluorescent tubes. The circuit is controlled by the L6585DE integrated circuit, which combines Power Factor Correction (PFC) and half-bridge control circuits along with necessary drivers. This solution manages all operating phases including preheating, ignition, and run mode while providing protections against lamp disconnection and overvoltage.
| Input voltage range | 85 to 265 V RMS |
|---|---|
| Line frequency | 50/60 Hz |
| Tube lamp number | 4 |
| Tube lamp type | T8 |
| Power per tube | 18 W |
| Power factor | ≥0.9 |
| Total harmonic distortion | ≤10% |
| Efficiency | ≈90% |
The ballast is controlled by the new L6585DE IC that integrates the PFC and half-bridge control circuits.
The circuit manages all operating phases including preheating, ignition, and run mode.
Protections against failures such as lamp disconnection, anti-capacitive mode, and PFC overvoltage are guaranteed.