L6561 is the imporved version of the L6560 standard power factor corrector ( Ic components). Fully compatible with the standard verision, I thas a superior performant multiplier making the device capable of working in wide input voltage range applications (from 85V to 265V) with an excellent THD. Furthemore the start up current has been reduces at few tens ofA and a disable function has been implemented on the ZCD pin, guaranteeing lower current consumption in stand by mode.
L6561 has 8 pins and they have different functions in the circuits. To know the functions of them can be help you if you design a circuit.
Pin Functions of L6561
1 INV: Inverting input of the error amplifer. A resistive divider is connected between the output regulated voltage and this point, to provide voltage feedback.
2 COMP: Output of error amplifier. A feedback compensation network is placed between this pin and the INV pin.
3 MULT: Input of the multiplier stage, A resistive divider connects to this pin the rectifid mains. A voltage signal, proportional to the rectified mains, appears on this pin.
4 CS: Input to the comparator of the control loop. The current is sensed by a resistor and the resulting voltage is applied to this pin.
5 ZCD: Zero current detection input. If it si connected to GND, the device is disabled.
6 GND: Current return for driver and control circuits.
7 GD: Gate driver output. A push pull output stage is able to drive the power MOS with peak current of 400mA ( source and sink)
8 Vcc: Supply coltage of driver and control circuits.