FAN4800A/C, FAN4801/1S/2/2L — PFC/PWM Controller Combination
April 2009
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
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
FAN4801/1S/2/2L Improve Efficiency at Light Load
f
RTCT
=4•f
PFC
=4•f
PWM
for FAN4800A and
FAN4801/1S
f
RTCT
=4•f
PFC
=2•f
PWM
for FAN4800C and
FAN4802/2L
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.
2.
Change R
AC
resister from the old value to a higher
resister: between 6MΩ to 8MΩ.
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.
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.
At full load, the average V
EA
needs to ~4.5V and
the ripple on the V
EA
needs to be less than 400mV.
Soft-Start pin, the soft-start current has been
reduced to half from the FAN4800 capacitor.
3.
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
4.
5.
Related Resources
Complete design instructions are detailed in application
note AN-6078SC (available in Chinese only).
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/1S/2/2L • Rev. 1.0.2
www.fairchildsemi.com
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FAN4800A/C, FAN4801/1S/2/2L — PFC/PWM Controller Combination
Ordering Information
Part Number
FAN4800ANY
FAN4800CNY
FAN4800AMY
FAN4800CMY
FAN4801NY
FAN4801SNY
FAN4802NY
FAN4802LNY
FAN4801MY
FAN4801SMY
FAN4802MY
FAN4802LMY
Operating
Temperature Range
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
Eco
Status
Green
Green
Green
Green
Green
Green
Green
Green
Green
Green
Green
Green
Package
16-pin Dual In-Line Package (DIP)
16-pin Dual In-Line Package (DIP)
16-pin Small Out-Line Package (SOP)
16-pin Small Out-Line Package (SOP)
16-pin Dual In-Line Package (DIP)
16-pin Dual In-Line Package (DIP)
16-pin Dual In-Line Package (DIP)
16-pin Dual In-Line Package (DIP)
16-pin Small Out-Line Package (SOP)
16-pin Small Out-Line Package (SOP)
16-pin Small Out-Line Package (SOP)
16-pin Small Out-Line Package (SOP)
Packing
Method
Tube
Tube
Tape and Reel
Tape and Reel
Tube
Tube
Tube
Tube
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
Part Number
FAN4800ANY
FAN4800AMY
FAN4800CNY
FAN4800CMY
FAN4801NY
FAN4801SNY
FAN4802NY
FAN4802LNY
FAN4801MY
FAN4801SMY
FAN4802MY
FAN4802LMY
PFC:PWM Frequency Ratio
1:1
1:1
1:2
1:2
1:1
1:1
1:2
1:2
1:1
1:1
1:2
1:2
Brown Out / In
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
0.9V / 1.65V
1.05V / 1.9V
1.05V / 1.9V
1.05V / 1.9V
0.9V / 1.65V
Range In / Out
NA
NA
NA
NA
1.95V / 2.45V
2.8V / 3.35V
1.95V / 2.45V
1.95V / 2.45V
1.95V / 2.45V
2.8V / 3.35V
1.95V / 2.45V
1.95V / 2.45V
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/1S/2/2L • Rev. 1.0.2
www.fairchildsemi.com
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