This application note describes electronic high frequency ballast based on VK05CFL designed to drive from 18 to 23W TC DEL and T5 removable fluorescent tubes. The design was performed for 185÷265 Vac main voltage.
The document details a dedicated low power electronic ballast solution based on the STMicroelectronics VKO5CFL integrated circuit. The design integrates the power stage and logic control in a monolithic structure, utilizing a half-bridge topology operating in zero voltage switching (ZVS) resonant mode to reduce losses and electromagnetic interference.
| Supported Lamp Power Range | 18 to 23W TC DEL and T5 removable fluorescent tubes |
|---|---|
| Input Voltage Range | 185+265 Vac main voltage |
| Pre-heating Frequency | 112KHz |
| Resonance Frequency (fres) | 66.8KHz |
| Steady State Working Frequency | 48 KHz |
| Duty Cycle (Steady State) | 49% |
| EoL Latching Time | 300ms |
The preheating time is less than 1s, specifically 880 ms in the tested configuration.
The circuit uses voltage sensing detection by monitoring the voltage across the low side preheating capacitor C12 to activate a latch when the tube fails.
Yes, by opening jumpers J1 and J2 and closing jumper J3, along with not mounting specific components like C11, R11, D2, R7, and R12.