Features
neitherPin-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 f RTCT=4•f PFC=4•f PWM for FAN4800A and克什米尔问题
FAN4801/1S
f RTCT=4•f PFC=2•f PWM for FAN4800C and
FAN4802/2L
Applications
Desktop PC Power Supply
Internet Server Power Supply
LCD TV, Monitor Power Supply
UPS
英语听读Battery Charger
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DC Motor Power Supply
Monitor Power Supply 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 ud in either current or voltage mode. In voltage mode, feed-forward from the PFC output bus can reduce the condary 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
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in ML4800 and FAN4800.
To start evaluating FAN4800A/C, FAN4801/1S/2/2L for replacing existing FAN4800 and ML4800 boa赢在起点早教
rds, five things must be done before the fine-tuning procedure:
1. Change R AC resister from the old value to a higher
resister: between 6MΩ to 8MΩ.
2. Change RT/CT pin from the existing values to
R T=6.8KΩ 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
FAN4801/1S/2/2L don’t 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
FAN4800A/C, FAN4801/1S/2/2L — PFC/PWM Controller Combination
FAN4800AMY -40°C to +105°C Green 16-pin Small Out-Line Package (SOP) Tape & Reel FAN4800CMY -40°C to +105°C Green 16-pin Small Out-Line Package (SOP) Tape & Reel
FAN4801NY -40°C to +105°C Green 16-pin Dual In-Line Package (DIP) Tube FAN4801SNY -40°C to +105°C Green 16-pin Dual In-Line Package (DIP) Tube FAN4802NY -40°C to +105°C Green 16-pin Dual In-Line Package (DIP)) Tube FAN4802LNY -40°C to +105°C Green 16-pin Dual In-Line Package (DIP)) Tube FAN4801MY -40°C to +105°C Green 16-pin Small Out-Line Package (SOP) Tape & Reel FAN4801SMY -40°C to +105°C Green 16-pin Small Out-Line Package (SOP) Tape & Reel FAN4802MY -40°C to +105°C Green 16-pin Small Out-Line Package (SOP) Tape & Reel FAN4802LMY
-40°C to +105°C
Green
rock and roll16-pin Small Out-Line Package (SOP)
Tape & Reel
For Fairchild’s definition of “green” Eco Status, plea visit: /company/green/rohs_green.html .
Part Number
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PFC:PWM Frequency Ratio
Brown Out / In
Range In / Out
FAN4800ANY 1:1 1.05V / 1.90V N.A FAN4800AMY 1:1 1.05V / 1.90V N.A FAN4800CNY 1:2 1.05V / 1.90V N.A FAN4800CMY 1:2 1.05V / 1.90V N.A FAN4801NY 1:1 1.05V / 1.90V 1.95V /
2.45V FAN4801SNY 1:1 1.05V / 1.90V 2.80V / 3.35V FAN4802NY 1:2 1.05V / 1.90V 1.95V / 2.45V FAN4802LNY 1:2 0.90V / 1.65V 1.95V / 2.45V FAN4801MY 1:1 1.05V / 1.90V 1.95V / 2.45V FAN4801SMY 1:1 1.05V / 1.90V 2.80V / 3.35V FAN4802MY 1:2 1.05V / 1.90V 1.95V / 2.45V FAN4802LMY
1:2
0.90V / 1.65V
1.95V /
2.45V
PFC/PWM Controller Combination
IEA RAMP
RT/CT FBPWM SS VRMS ISENSE IAC ILIMIT
GND OPWM OPFC VDD VREFthomas newcomen
FBPFC VEA FAN4800A/C FAN4801/1S/2/2L
VDD
VREF
Secondary
vividlyFigure 1.
Typical Application Current Mode
PFC/PWM Controller Combination
IEA RAMP
RT/CT FBPWM SS VRMS ISENSE IAC ILIMIT
GND OPWM OPFC VDD VREF
FBPFC VEA FAN4800A/C FAN4801/1S/2/2L VDD
VREF
Secondary
VREF
Figure 2.
Typical Application Voltage Mode
PFC/PWM Controller Combination
Figure 3. FAN4800A/C Function Block Diagram
