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FAN4822 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN4822 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page www.fairchildsemi.com REV. 1.0.1 8/10/01 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 Description The 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. Block Diagram Q S R – + 1 14 VEAO VEA 2.5V FB 4 IAC 5 VRMS + – 3 ISENSE 8 GND 2 IEAO + – IEA R+ R– + – – – 6 RTCT OSC GAIN MODULATOR S R Q + – 2.7V FB –1V 12 VCC VCCZ 13.5V ZVS OUT 11 Q S R Q PFC OUT 9 PWR GND 10 OVP I LIMIT REF 13 ZV SENSE 7 + VCCZ REF Q FAN4822 ZVS Average Current PFC Controller |
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