Part # Application Notes Power Supply And Power Management L6563A l6563 AN2485 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: 400W FOT-CONTROLLED PFC PRE-REGULATOR WITH THE L6563


Part Details:

AN2485 Application note 400 W FOT-controlled PFC pre-regulator with the L6563 Introduction This application note describes an evaluation board based on the Transition-mode PFC controller L6563 and presents the results of the bench evaluation. The board implements a 400 W, wide-range mains input, a PFC pre-conditioner suitable for ATX PSU, or a flat screen display. The chip is operated with Fixed-Off-Time control in order to use a low-cost device like the L6563 which is usually prohibitive at this power level. Fixed-Off-Time control allows Continuous Conduction Mode operation which is normally achieved with more expensive control chips and more complex control architectures. L6563 400W FOT PFC Demo board (EVAL6563-400W) March 2007 Rev 1 1/29 www.st.com Contents AN2485 Contents 1 Main characteristics and circuit description . . . . . . . . . . . . . . . . . . . . . 4 2 Test results and significant waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Harmonic content measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Inductor current in FOT and L6563 THD optimizer . . . . . . . . . . . . . . . . . 10 2.3 Voltage feedforward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.4 Start-up and RUN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.5 Start-up at light load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.6 Open loop protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.7 Power management/housekeeping functions . . . . . . . . . . . . . . . . . . . . . . 17 3 Layout hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4 Audible noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5 Thermal measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6 Conducted emission pre-compliance test . . . . . . . . . . . . . . . . . . . . . . 22 7 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8 PFC coil specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8.1 General description and characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8.3 Mechanical aspect and pin numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2/29


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Application Notes Power Supply And Power Management L6563A l6563 AN2485.pdf Datasheet