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 January 2011
?2008 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN4800A/C, FAN4801/02/02L " Rev. 1.0.3 1
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 
?   f
RTCT
=4"f
PFC
=4"f
PWM
 for FAN4800A and FAN4801
?   f
RTCT
=4"f
PFC
=2"f
PWM
 for FAN4800C and
FAN4802/02L
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 FAN4801/02/2L
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   FAN4801/02/02L   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. Brownout protection and
PFC   soft-start   functions   are   not   in   ML4800   and
FAN4800.
To evaluate FAN4800A/C, FAN4801/02/2L for replacing
existing FAN4800 and ML4800 boards, five things must
be completed before the fine-tuning procedure:
1.    Change R
AC
 resister from the old value to a higher
resister: between 6MW to 8MW.
2.    Change RT/CT pin from the existing values to
R
T
=6.8KW and C
T
=1000pF to have f
PFC
=64KHz,
f
PWM
=64KHz.
3.    VRMS pin needs to be 1.224V at V
IN
=85 V
AC
  for
universal input application from line input from
85V
AC
  to 270 V
AC
. Both poles for the V
rms
  of
FAN4801/02/02L dont need to substantially slower
than FAN4800; about 5 to 10 times.
4.    At full load, the average V
EA
 needs to ~4.5V and the
ripple on the V
EA
 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
?
AN-8027 - FAN480X PFC+PWM Combination
Controller Application
  
 
 
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相关代理商/技术参数
FAN4802NY 功能描述:电流型 PWM 控制器 PWM PFC Combo RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
FAN4802SMY 功能描述:电流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
FAN4802SNY 功能描述:电流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
FAN4803 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo
FAN4803CP1 功能描述:功率因数校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
FAN4803CP-1 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo
FAN4803CP1_Q 功能描述:功率因数校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
FAN4803CP2 功能描述:功率因数校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel