Description
The L6563H is a current-mode PFC controller operating in transition mode (TM) which embeds the same features existing in the L6563S with the addition of a high voltage start-up source. These functions make the IC especially suitable for applications that have to be compliant with energy saving regulations and where the PFC pre-regulator works as the master stage.
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% at Tj = 25 °C) internal voltage reference. Loops stability is optimized by the voltage feedforward function (1/V2 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.

Features
● On-board 700 V start-up source
● Tracking boost function
● Fast “bidirectional” input voltage feedforward (1/V2 correction)
● Interface for cascaded converters 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% (at TJ = 25 °C) internal reference voltage
● -600/+800 mA totem pole gate driver with active pull-down during UVLO

Applications
● PFC pre-regulators for:
   – Hi-end AC-DC adapter/charger
   – IEC61000-3-2 or JEITA-MITI compliant SMPS, in excess of 400 W
● SMPS for LED luminaires