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FAN4800AUM Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN4800AUM Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 21 page October 2011 © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800AU/CU • Rev. 1.0.0 FAN4800AU/CU PFC/ PWM Controller Combination Features Pin-to-Pin Compatible with ML4800, FAN4800, 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 Cycle-by-Cycle Current Limiting for PFC/PWM Power-on Sequence Control and Soft-Start Line Sagging Protection fRTCT=4•fPFC=4•fPWM for FAN4800AU fRTCT=4•fPFC=2•fPWM for FAN4800CU Applications Desktop PC Power Supply Internet Server Power Supply LCD TV/ Monitor Power Supply UPS Battery Charger DC Motor Power Supply Monitor Power Supply Telecom System Power Supply Distributed Power Related Resources AN-8027 — FAN480X PFC+PWM Combination Controller Application Description The highly integrated FAN4800AU/CU parts are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections and compensation. They are available in 16-pin DIP and SOP packages. The PWM can be used in current or Voltage Mode. In Voltage Mode, feed-forward from the PFC output bus can reduce secondary output ripple. To evaluate FAN4800AU/CU for replacing existing FAN4800A/C, FAN4800AS/CS, old version FAN4800 and ML4800 boards, six things must be completed before the fine-tuning procedure: 1. Change RAC resistor from the old value to a higher resistor value: 6M to 8M. 2. Change RT/CT pin from the existing values to RT=6.8K and CT=1000pF to have fPFC=64kHz and fPWM=64kHz. 3. The VRMS pin needs to be 1.224V at VIN=85VAC for universal input application with line input from 85VAC to 270 VAC. 4. Change ISENSE pin filter from the exiting values to RFilter=51 and CFilter=0.01µF for higher bandwidth. 5. At full load, the average VVEA must be ~4.5V and ripple on VVEA needs to be less than 400mV. 6. For the SS pin, the soft-start current has been reduced to half the FAN4800 capacitor. There are two differences from FAN4800AS/CS to FAN4800AU/CU: Add Line Sagging Protection Fix Inductance Current Instability during AC Cycle Drop Test |
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