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FAN4800AS/01S — PFC/PWM Controller Combination
April 2010
FAN4800AS / FAN4801S
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
f
RTCT
=4•f
PFC
=4•f
PWM
for FAN4800AS/01S
Description
The highly integrated FAN4800AS/01S 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/01S have lower operation
current that saves power consumption in external
devices. FAN4800AS/01S 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/01S for replacing existing
FAN4800 and ML4800 boards, five things must be
completed 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 and
f
PWM
=64kHz.
The VRMS pin needs to be 1.224V at V
IN
=85 V
AC
for universal input application from line input from
85V
AC
to 270V
AC
.
At full load, the average V
VEA
needs to be ~4.5V
and the ripple of V
VEA
needs to be less than
400mV.
For the Soft-Start pin, the soft-start current has
been reduced to half the FAN4800 capacitor.
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
3.
4.
5.
There are two differences from FAN4800A/01 to
FAN4800AS/01S:
1.
2.
Under-voltage protection
extended to one second.
debounce
time
is
Related Resources
AN-8027 - FAN480X PFC+PWM Combination
Controller Application
PWM gate clamp voltage is raised to 19V.
© 2010 Fairchild Semiconductor Corporation
FAN4800AS/01S • Rev. 1.0.0
www.fairchildsemi.com
FAN4800AS/01S — PFC/PWM Controller Combination
Ordering Information
Part Number
FAN4800ASNY
FAN4800ASMY
FAN4801SNY
FAN4801SMY
Operating Temperature Range
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
-40°C to +105°C
Package
16-Pin Dual Inline Package (DIP)
16-Pin Small Outline Package (SOP)
16-Pin Dual Inline Package (DIP)
16-Pin Small Outline Package (SOP)
Packing Method
Tube
Tape & Reel
Tube
Tape & Reel
Application Diagram
Figure 1.
Typical Application, Current Mode
© 2010 Fairchild Semiconductor Corporation
FAN4800AS/01S • Rev. 1.0.0
www.fairchildsemi.com
2
DSP and ARM Processors
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