FAN4822IM ,Power Factor Correction (PFC) ControllerGeneral Description• Average current sensing, continuous boost, leading edge The FAN4822 is a PFC c ..
FAN4822IM ,Power Factor Correction (PFC) Controllerfeatures include undervoltage lockout, over-• UVLO, current limit, and soft-start voltage protectio ..
FAN4822IM ,Power Factor Correction (PFC) ControllerBlock Diagram1 8 2VEAO GND IEAOFBVEAVCC14 –OVP12VCCZ+FB+2.5VR+13.5VIEA2.7V –+IAC+GAIN4 –MODULATOR–S ..
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FAN4822IM-FAN4822IMX
Power Factor Correction (PFC) Controller
Features Average current sensing, continuous boost, leading edge
PFC for low total harmonic distortion and near unity
power factor Built-in ZVS switch control with fast response for high
efficiency at high power levels Average line voltage compensation with brownout control Current fed gain modulator improves noise immunity and
provides universal input operation Overvoltage comparator eliminates output “runaway” due
to load removal UVLO, current limit, and soft-start Precision 1.3% reference
General DescriptionThe FAN4822 is a PFC controller designed specifically for
high power applications. The controller contains all of the
functions necessary to implement an average current boost
PFC converter, along with a Zero Voltage Switch (ZVS) con-
troller to reduce diode recovery and MOSFET turn-on
losses.
The average current boost PFC circuit provides high power
factor (>98%) and low Total Harmonic Distortion (THD).
Built-in safety features include undervoltage lockout, over-
voltage protection, peak current limiting, and input voltage
brownout protection.
The ZVS control section drives an external ZVS MOSFET
which, combined with a diode and inductor, soft switches the
boost regulator. This technique reduces diode reverse recov-
ery and MOSFET switching losses to reduce EMI and maxi-
mize efficiency.
