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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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FAN4801MY 데이터시트(PDF) 1 Page - Fairchild Semiconductor |
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FAN4801MY 데이터시트(HTML) 1 Page - Fairchild Semiconductor |
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1 / 24 page  March 2009 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800A/C, FAN4801/1S/2/2L • Rev. 1.0.1 FAN4800A/C, FAN4801/1S/2/2L 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 Cycle-by-Cycle Current Limiting for PFC/PWM Power-on Sequence Control and Soft-Start Brownout Protection Interleaved PFC/PWM Switching FAN4801/1S/2/2L Improve Efficiency at Light Load fRTCT=4•fPFC=4•fPWM for FAN4800A and FAN4801/1S fRTCT=4•fPFC=2•fPWM for FAN4800C and FAN4802/2L 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 Description The highly integrated FAN4800A/C and FAN4801/1S/2/2L are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections / compensation. They are available in 16-pin DIP and SOP packages. The PWM can be used in either current or voltage mode. In voltage mode, feed-forward from the PFC output bus can reduce the secondary output ripple. Compared with older productions, ML4800 and FAN4800, FAN4800A/C and FAN4801/1S/2/2L have lower operation current that save power consumption in external devices. FAN4800A/C and FAN4801/1S/2/2L have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Specifically, the brownout protection and PFC soft-start functions are not in ML4800 and FAN4800. To start evaluating FAN4800A/C, FAN4801/1S/2/2L for replacing existing FAN4800 and ML4800 boards, five things must be done before the fine-tuning procedure: 1. Change RAC resister from the old value to a higher resister: between 6M Ω to 8MΩ. 2. Change RT/CT pin from the existing values to RT=6.8KΩ and CT=1000pF to have fPFC=64KHz, fPWM=64KHz. 3. VRMS pin needs to be 1.224V at VIN=85 VAC for universal input application from line input from 85VAC to 270 VAC. Both poles for the Vrms of FAN4801/1S/2/2L don’t need to substantially slower than FAN4800; about 5 to 10 times. 4. At full load, the average VEA needs to ~4.5V and the ripple on the VEA needs to be less than 400mV. 5. Soft-Start pin, the soft-start current has been reduced to half from the FAN4800 capacitor. Related Resources Complete design instructions are detailed in application note AN-6078SC (available in Chinese only). |
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