FAN4800A/C, FAN4801/02/02L PFC/PWM Controller Combination
January 2011
FAN4800A/C, FAN4801/02/02L
PFC/PWM Controller Combination
Features Description
The highly integrated FAN4800A/C and FAN4801/02/2L
Pin-to-Pin Compatible with ML4800 and FAN4800
are specially designed for power supplies that consist of
and CM6800 and CM6800A
boost PFC and PWM. They require very few external
PWM Configurable for Current-Mode or
components to achieve versatile protections /
Feed-forward Voltage-Mode Operation
compensation. They are available in 16-pin DIP and
SOP packages.
Internally Synchronized Leading-Edge PFC and
Trailing-Edge PWM in one IC
The PWM can be used in either current or voltage
mode. In voltage mode, feed-forward from the PFC
Low Operating Current
output bus can reduce the secondary output ripple.
Innovative Switching-Charge Multiplier Divider
Compared with older productions, ML4800 and
Average-Current-Mode for Input-Current Shaping
FAN4800, FAN4800A/C and FAN4801/02/02L have
lower operation current that save power consumption in
PFC Over-Voltage and Under-Voltage Protections
external devices. FAN4800A/C and FAN4801/1S/2/2L
PFC Feedback Open-Loop Protection
have accurate 49.9% maximum duty of PWM that
makes the hold-up time longer. Brownout protection and
Peak Current Limiting for PFC
PFC soft-start functions are not in ML4800 and
Cycle-by-Cycle Current Limiting for PWM
FAN4800.
Power-On Sequence Control and Soft-Start
To evaluate FAN4800A/C, FAN4801/02/2L for replacing
existing FAN4800 and ML4800 boards, five things must
Brownout Protection
be completed before the fine-tuning procedure:
Interleaved PFC/PWM Switching
1. Change R resister from the old value to a higher
AC
FAN4801/02/02L Improve Efficiency at Light Load
resister: between 6M to 8M.
f =4f =4f for FAN4800A and FAN4801
RTCT PFC PWM
2. Change RT/CT pin from the existing values to
f =4f =2f for FAN4800C and R =6.8K and C =1000pF to have f =64KHz,
RTCT PFC PWM T T PFC
FAN4802/02L f =64KHz.
PWM
3. VRMS pin needs to be 1.224V at V =85 V for
IN AC
universal input application from line input from
Applications
85V to 270 V . Both poles for the V of
AC AC rms
FAN4801/02/02L dont need to substantially slower
Desktop PC Power Supply
than FAN4800; about 5 to 10 times.
Internet Server Power Supply
4. At full load, the average V needs to ~4.5V and the
EA
LCD TV, Monitor Power Supply
ripple on the V needs to be less than 400mV.
EA
UPS
5. Soft-Start pin, the soft-start current has been
Battery Charger reduced to half from the FAN4800 capacitor.
DC Motor Power Supply
Monitor Power Supply
Related Resources
Telecom System Power Supply
AN-8027 - FAN480X PFC+PWM Combination
Controller Application
Distributed Power
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
Ordering Information
Operating
Part Number Package Packing Method
Temperature Range
FAN4800ANY -40C to +105C 16-Pin Dual In-Line Package (DIP) Tube
FAN4800CNY -40C to +105C 16-Pin Dual In-Line Package (DIP) Tube
FAN4800AMY -40C to +105C 16-Pin Small Outline Package (SOP) Tape & Reel
FAN4800CMY -40C to +105C 16-Pin Small Outline Package (SOP) Tape & Reel
FAN4801NY -40C to +105C 16-Pin Dual In-Line Package (DIP) Tube
FAN4802NY -40C to +105C 16-Pin Dual In-Line Package (DIP)) Tube
FAN4802LNY -40C to +105C 16-Pin Dual In-Line Package (DIP)) Tube
FAN4801MY -40C to +105C 16-Pin Small Outline Package (SOP) Tape & Reel
FAN4802MY -40C to +105C 16-Pin Small Outline Package (SOP) Tape & Reel
FAN4802LMY -40C to +105C 16-Pin Small Outline Package (SOP) Tape & Reel
Part Number PFC:PWM Frequency Ratio Brownout / In Range In / Out
FAN4800ANY 1:1 1.05V / 1.9V N.A
FAN4800AMY 1:1 1.05V / 1.9V N.A
FAN4800CNY 1:2 1.05V / 1.9V N.A
FAN4800CMY 1:2 1.05V / 1.9V N.A
FAN4801NY 1:1 1.05V / 1.9V 1.95V / 2.45V
FAN4802NY 1:2 1.05V / 1.9V 1.95V / 2.45V
FAN4802LNY 1:2 0.9V / 1.65V 1.95V / 2.45V
FAN4801MY 1:1 1.05V / 1.9V 1.95V / 2.45V
FAN4802MY 1:2 1.05V / 1.9V 1.95V / 2.45V
FAN4802LMY 1:2 0.9V / 1.65V 1.95V / 2.45V
2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN4800A/C, FAN4801/02/02L Rev. 1.0.3 2