Part # Application Notes Lighting Control L6382D5 L6382D STEVAL-ILB002V1 AN2459 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Digital Power Factor Correction for Tube Lamp Ballasts and Other Digital Power Supplies Controlled by 8-Bit Microcontroller


Part Details:

AN2459 Application note Digital Power Factor Correction for Tube Lamp Ballasts and other digital power supplies controlled by an 8-bit microcontroller 1 Introduction The electronic ballast market has undergone dramatic changes over the last few years. It has moved from full analog, very differentiated applications made by a collection of drivers and controllers, where use of custom ASICs was widespread, to a couple of standard platforms.The basic building blocks are still the same. They include a power factor corrector stage and an inverting high voltage stage (Figure 1). On the one hand, analog platforms are targeting the low cost/basic performance applications. Their main drivers and controllers are widely used and well known ICs such as Power Factor Correctors (L6561/2/3) and High Voltage Ballast Controllers (L6569x/ L6571x/ L6574). On the other hand, a new digital platform concept has gained more interest and acceptance. A microcontroller with a simple Half Bridge Driver (L638x) has replaced the ballast controller. The Half Bridge Driver is used mainly for high-end applications, especially where the microcontroller has to deal with communication tasks (e.g. using the Dali protocol). STMicroelectronics digital ballast reference design STEVAL-ILB002V1 introduces a safe operating Power Factor Controller (PFC) and Ballast Controller. Even with relatively simple microcontroller firmware routines, the results for power control and ballast protection are in line with advanced analog controlled ballasts, while adding flexibility, for example, the possibility to drive a wide variety of lamps, or to easily introduce different protection schemes.This application note deals in detail with the first block of the digital ballast, which provides stable DC bus voltage for the halfbridge in all load conditions, as well as controlling the input current shape which fulfills IEC standards (6.: IEC 61000-3-2 "Electromagnetic compatibility".).The final description of the digital ballast - the lamp control block - will be described in detail in a separate application note. Figure 1. Digital ballast scheme Input Filter 8- Bit Power Microcontroller Manageme nt Unit ST7FLITE19B L6382D5 January 2007 Rev 1 1/35 www.st.com Contents AN2459 - Application note Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Power Factor Correction (PFC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Transition Mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Digital implementation - Enhanced One Pulse Mode . . . . . . . . . . . . . . . . . 6 3 Power circuits design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 Power components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Bill of material (STEVAL-ILB002V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 Signals measurement, processing & control . . . . . . . . . . . . . . . . . . . . 15 4.1 Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2 Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3 Zero Current Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.4 MOSFET current measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5 Conclusion and outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6 References and related materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Appendix A Components calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28


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