Part # Application Notes Power Supply And Power Management L6562A AN2755 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: 400 W FOT-controlled PFC pre-regulator with the L6562A


Part Details:

AN2755 Application note 400 W FOT-controlled PFC pre-regulator with the L6562A Introduction This application note describes an demonstration board based on the transition-mode PFC controller L6562A and presents the results of its bench demonstration. The board implements a 400 W, wide-range mains input PFC pre-conditioner suitable for ATX PSU, flat screen displays, etc. In order to allow the use of a low-cost device like the L6562A at this power level, usually prohibitive for this device, the chip is operated with fixed-off-time control. This allows continuous conduction mode operation, normally achievable with more expensive control chips and more complex control architectures. Figure 1. Demonstration board (EVL6562A-400W) July 2008 Rev 1 1/24 www.st.com Contents AN2755 Contents 1 Main characteristics and circuit description . . . . . . . . . . . . . . . . . . . . . 5 2 Test results and significant waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Harmonic content measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Inductor current in FOT and L6562A THD optimizer . . . . . . . . . . . . . . . . 10 2.3 Overvoltage protection and disable function . . . . . . . . . . . . . . . . . . . . . . 11 3 Layout hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 Audible noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 Thermal measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 Conducted emission pre-compliance test . . . . . . . . . . . . . . . . . . . . . . 16 7 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 PFC coil specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.1 General description and characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.3 Mechanical aspect and pin numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 AN2755 List of tables List of tables Table 1. Measured temperature table at 115 Vac and 230 Vac - full load . . . . . . . . . . . . . . . . . . . . 15


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Application Notes Power Supply And Power Management L6562A AN2755.pdf Datasheet