This application note introduces the L6585D control IC, a new PFC control IC for electronic ballasts. This IC integrates both PFC and half-bridge sections, and embeds a wide range of features to provide an energy saving and cost effective solution.
This document describes the L6585D, a high-voltage single-chip control IC designed to manage electronic ballasts for fluorescent lamps. The device integrates both Power Factor Correction (PFC) and half-bridge sections to provide an energy-saving and cost-effective solution. It features advanced logic for managing lamp critical conditions, including pre-heating, ignition, and fault detection, while optimizing harmonic content mitigation.
| PFC driver source current | 300 mA |
|---|---|
| PFC driver sink current | 600 mA |
| Half-bridge driver source current | 290 mA |
| Half-bridge driver sink current | 480 mA |
| PFC gate driver pulse frequency | 15 kHz |
| ZCD starter maximum frequency | 15 kHz |
| E/A output low clamp voltage | 2.25 V |
| E/A output high clamp voltage | 4.2 V |
| CTR internal comparator reference | 3.4 V |
| INV voltage threshold for latched stop | 1.2 V |
The L6585D is designed to manage electronic ballasts for fluorescent lamps, including both Power Factor Correction and half-bridge sections.
The device allows independent adjustment of pre-heating and ignition durations and includes innovative circuitry for improved lamp voltage control during ignition.
During start-up, an internal structure forces the PFC gate driver to switch for the first cycles at a typical frequency of 15 kHz until the ZCD signal is generated.
It uses a fast OVP detector based on a resistive divider connected to the CTR pin, and stops the PF gate driver if the E/A output goes below 2.25 V.