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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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FAN4800CSNY 데이터시트(PDF) 1 Page - Fairchild Semiconductor |
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FAN4800CSNY 데이터시트(HTML) 1 Page - Fairchild Semiconductor |
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1 / 19 page  December 2010 © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800AS/CS/01S/02S • Rev. 1.0.1 FAN4800AS/CS/01S/2S PFC/PWM Controller Combination Features Pin-to-Pin Compatible with ML4800 and FAN4800 and CM6800 and CM6800A PWM Configurable for Current Mode or Feedforward 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 Improved Efficiency at Light Load fRTCT=4•fPFC=4•fPWM for FAN4800AS/01S fRTCT=4•fPFC=2•fPWM for FAN4800CS/02S 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 FAN4800AS/CS/01S/02S parts 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, FAN4800AS/CS/01S/02S have lower operation current that saves power consumption in external devices. FAN4800AS/CS/01S/02S have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Brownout protection and PFC soft- start functions available in this series are not available in ML4800 and FAN4800. To evaluate FAN4800AS/CS/01S/02S for replacing existing FAN4800 and ML4800 boards, five things must be completed 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 and fPWM=64kHz. 3. The VRMS pin needs to be 1.224V at VIN=85 VAC for universal input application from line input from 85VAC to 270VAC. 4. At full load, the average VVEA needs to be ~4.5V and the ripple of VVEA needs to be less than 400mV. 5. For the Soft-Start pin, the soft-start current has been reduced to half the FAN4800 capacitor. There are two differences from FAN4800A/C/01/02 to FAN4800AS/CS/01S/02S: 1. Under-voltage protection debounce time is extended to one second. 2. PWM gate clamp voltage is raised to 19V. |
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