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ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN4800A/C, FAN4801/02/02L PFC/PWM Controller Combination January 2011 FAN4800A/C, FAN4801/02/02L PFC/PWM Controller Combination Features Description The highly integrated FAN4800A/C and FAN4801/02/2L Pin-to-Pin Compatible with ML4800 and FAN4800 are specially designed for power supplies that consist of and CM6800 and CM6800A boost PFC and PWM. They require very few external PWM Configurable for Current-Mode or components to achieve versatile protections / Feed-forward Voltage-Mode Operation compensation. They are available in 16-pin DIP and SOP packages. Internally Synchronized Leading-Edge PFC and Trailing-Edge PWM in one IC The PWM can be used in either current or voltage mode. In voltage mode, feed-forward from the PFC Low Operating Current output bus can reduce the secondary output ripple. Innovative Switching-Charge Multiplier Divider Compared with older productions, ML4800 and Average-Current-Mode for Input-Current Shaping FAN4800, FAN4800A/C and FAN4801/02/02L have lower operation current that save power consumption in PFC Over-Voltage and Under-Voltage Protections external devices. FAN4800A/C and FAN4801/1S/2/2L PFC Feedback Open-Loop Protection have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Brownout protection and Peak Current Limiting for PFC PFC soft-start functions are not in ML4800 and Cycle-by-Cycle Current Limiting for PWM FAN4800. Power-On Sequence Control and Soft-Start To evaluate FAN4800A/C, FAN4801/02/2L for replacing existing FAN4800 and ML4800 boards, five things must Brownout Protection be completed before the fine-tuning procedure: Interleaved PFC/PWM Switching 1. Change R resister from the old value to a higher AC FAN4801/02/02L Improve Efficiency at Light Load resister: between 6M to 8M. f =4f =4f for FAN4800A and FAN4801 RTCT PFC PWM 2. Change RT/CT pin from the existing values to f =4f =2f for FAN4800C and R =6.8K and C =1000pF to have f =64KHz, RTCT PFC PWM T T PFC FAN4802/02L f =64KHz. PWM 3. VRMS pin needs to be 1.224V at V =85 V for IN AC universal input application from line input from Applications 85V to 270 V . Both poles for the V of AC AC rms FAN4801/02/02L dont need to substantially slower Desktop PC Power Supply than FAN4800 about 5 to 10 times. Internet Server Power Supply 4. At full load, the average V needs to ~4.5V and the EA LCD TV, Monitor Power Supply ripple on the V needs to be less than 400mV. EA UPS 5. Soft-Start pin, the soft-start current has been Battery Charger reduced to half from the FAN4800 capacitor. DC Motor Power Supply Monitor Power Supply Related Resources Telecom System Power Supply AN-8027 - FAN480X PFC+PWM Combination Controller Application Distributed Power 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800A/C, FAN4801/02/02L Rev. 1.0.3 1