Part # Application Notes Lighting Control L6585D AN2510 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Combo IC for PFC and ballast control


Part Details:

AN2510 Application note Combo IC for PFC and ballast control Introduction A new control IC, the L6585D, has been designed to manage electronic ballasts for fluorescent lamps. It includes both Power Factor Correction and half-bridge sections and embeds a wide range of features to provide an energy saving and cost effective solution. The high-voltage single chip approach optimizes the management of lamp critical conditions such as the pre-heating and ignition of start up and fault and lamp replacement. The internal logic, guided by precise internal references and timings, is able to carry out all of these phases. The PFC section has superior performance in terms of harmonic content mitigation. High Power Factor (PF) and Total Harmonic Distortion (THD) reduction are obtained as required by international norms, especially concerning Universal input voltage operations. Particular care has been given to pre-heating and ignition phases prior to lamp start up in order to ensure the proper filament warming up and extend lamp life. Innovative circuitry allows an improved control of the lamp voltage during ignition as well as protection against failures due to lamp aging. The use of this new control IC simplifies the industrialization of electronic ballasts which increases application reliability and reduces its dimensions and cost. March 2007 Rev 1 1/22 www.st.com Contents AN2510 Contents 1 L6585 Integrated circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Device blocks description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Start-up and shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 PFC section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.1 Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.2 Over-voltage and feedback disconnection detection . . . . . . . . . . . . . . . . 6 2.2.3 Zero Current Detection and triggering block . . . . . . . . . . . . . . . . . . . . . . 7 2.2.4 Multiplier block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.5 Current comparator and choke saturation detection . . . . . . . . . . . . . . . . 8 2.2.6 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Oscillator and pre-heating / ignition / run mode sequencing . . . . . . . . . . . 8 2.4 Half-bridge current sensing: lamp voltage / power control . . . . . . . . . . . . . 9 2.4.1 Controlled lamp voltage/current during ignition . . . . . . . . . . . . . . . . . . . . 9 2.4.2 Over-current protection during run mode . . . . . . . . . . . . . . . . . . . . . . . . 11 2.5 End of life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.5.1 End-of-life detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.6 Re-lamp comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 L6585 Biasing circuitry (pin by pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1 Pin1 OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14


Please click the following link to download the datasheet:

Application Notes Lighting Control L6585D AN2510.pdf Datasheet