ST L6563S

The L6563S is a current-mode PFC controller operating in transition mode (TM). Coming with the same pin-out as its predecessor L6563, it offers improved performance and additional functions. The highly linear multiplier, along with a special correction circuit that reduces crossover distortion of the mains current, allows wide-range-mains operation with an extremely low THD even over a large load range. The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% @TJ = 25 °C) internal voltage reference. Loop's stability is optimized by the voltage feedforward function (1/ν² correction), which in this IC uses a proprietary technique that considerably improves line transient response as well in case of mains both drops and surges ("bidirectional"). Additionally, the IC provides the option for tracking boost operation, i.e. the output voltage is changed tracking the mains voltage.

• Tracking boost function
• Fast "bidirectional" input voltage feedforward
• 1/V² correction
• Interface for cascaded converter's PWM controller
• Remote ON/OFF control
• Accurate adjustable output overvoltage protection
• Protection against feedback loop disconnection (latched shutdown)
• Inductor saturation protection
• Low (≤100 μA) start-up current
• 6 mA max. operating bias current
• 1% @TJ = 25 °C internal reference voltage
• -600/+800 mA totem pole gate driver with active pull-down during UVLO
• SO14 package

• PFC pre-regulators for high-end AC-DC adapter/charger
• Desktop PC, server, Web server
• IEC61000-3-2 or JEITA-MITI compliant SMPS, in excess of 40W