L6585DE STMicroelectronics

L6585DE Combo IC for PFC and ballast control Features PFC section transition mode PFC with over-current protection over-voltage protection SO-20 feedback disconnection under-voltage lockout programmable and precise end-of-life PFC choke saturation detection protection compliant with all ballast THD optimizer configurations Half-bridge section smart hard switching detection preheating and ignition phases fast ignition voltage control with choke independently programmable saturation detection 3 % oscillator precision half-bridge over-current control 1.2 s dead time Figure 1. Block diagram April 2009 Rev 2 1/33 www.st.com 33Contents L6585DE Contents 1 Pin settings 4 1.1 Connection . 4 1.2 Functions 4 2 Electrical data 7 2.1 Maximum ratings 7 3 Electrical characteristics . 8 4 Device description . 13 5 Application information . 14 5.1 VCC section . 14 5.2 PFC section . 15 5.2.1 TM PFC operation . 15 5.2.2 Leading edge blanking 16 5.2.3 THD optimizer feature 16 5.2.4 Over-voltage protection . 17 5.2.5 Disabling the L6585DE . 17 5.2.6 Feedback disconnection protection 17 5.2.7 PFC over-current protection 17 6 Ballast section . 18 6.1 Half-bridge drivers and integrated bootstrap diode . 18 6.2 Normal start-up description . 18 6.3 Startup sequence with old or damaged lamps . 21 6.4 Old lamp management during run mode . 22 6.5 Rectifying effect 22 6.6 Over-current protection 25 6.7 Hard switching protection . 25 2/33