Document
FAN4800A/C, FAN4801/02/02L — PFC/PWM Controller Combination
January 2011
FAN4800A/C, FAN4801/02/02L PFC/PWM Controller Combination
Features
Pin-to-Pin Compatible with ML4800 and FAN4800
and CM6800 and CM6800A
PWM Configurable for Current-Mode or
Feed-forward Voltage-Mode Operation
Internally Synchronized Leading-Edge PFC and
Trailing-Edge PWM in one IC
Low Operating Current Innovative Switching-Charge Multiplier Divider Average-Current-Mode for Input-Current Shaping PFC Over-Voltage and Under-Voltage Protections PFC Feedback Open-Loop Protection Peak Current Limiting for PFC Cycle-by-Cycle Current Limiting for PWM Power-On Sequence Control and Soft-Start Brownout Protection Interleaved PFC/PWM Switching FAN4801/02/02L Improve Efficiency at Light Load fRTCT=4•fPFC=4•fPWM for FAN4800A and FAN4801 fRTCT=4•fPFC=2•fPWM for FAN4800C and
FAN4802/02L
Applications
Desktop PC Power Supply Internet Server Power S.