The document introduces the application circuits of L6561 and L6569, mainly including PFC circuit and electronic ballast circuit.
This document describes an application developed to supply two 18W fluorescent lamps. The circuit consists of two sections: a Power Factor Corrected (PFC) preregulator using the L6561 IC, and a lamp ballast stage using the L6569 IC. The PFC section boosts the rectified AC mains voltage to a controlled DC value of 400 Volts using transition mode control. The ballast section utilizes a high voltage half-bridge driver with a built-in oscillator to operate the lamps in Zero Voltage Switching mode, reducing switching losses and electromagnetic interference.
| Number of lamps | two 18W fluorescent lamps |
|---|---|
| Preheating frequency | about 80 kHz |
| Steady state frequency | 44 kHz |
The application uses the L6561 for the PFC preregulator and the L6569 for the lamp ballast stage.
The application is developed to supply two 18W fluorescent lamps.