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Fairchild Semiconductor Electronic Components Datasheet

FAN4800A Datasheet

PFC/PWM Controller Combination

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January 2011
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
fRTCT=4•fPFC=4•fPWM for FAN4800A and FAN4801
fRTCT=4•fPFC=2•fPWM 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 RAC resister from the old value to a higher
resister: between 6Mto 8M.
2. Change RT/CT pin from the existing values to
RT=6.8Kand CT=1000pF to have fPFC=64KHz,
fPWM=64KHz.
3. VRMS pin needs to be 1.224V at VIN=85 VAC for
universal input application from line input from
85VAC to 270 VAC. Both poles for the Vrms of
FAN4801/02/02L don’t need to substantially slower
than FAN4800; about 5 to 10 times.
4. At full load, the average VEA needs to ~4.5V and the
ripple on the VEA 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
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN4800A Datasheet

PFC/PWM Controller Combination

No Preview Available !

Ordering Information
Part Number
FAN4800ANY
FAN4800CNY
FAN4800AMY
FAN4800CMY
FAN4801NY
FAN4802NY
FAN4802LNY
FAN4801MY
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
Package
16-Pin Dual In-Line Package (DIP)
16-Pin Dual In-Line Package (DIP)
16-Pin Small Outline Package (SOP)
16-Pin Small Outline 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 Small Outline Package (SOP)
16-Pin Small Outline Package (SOP)
16-Pin Small Outline Package (SOP)
Packing Method
Tube
Tube
Tape & Reel
Tape & Reel
Tube
Tube
Tube
Tape & Reel
Tape & Reel
Tape & Reel
Part Number
FAN4800ANY
FAN4800AMY
FAN4800CNY
FAN4800CMY
FAN4801NY
FAN4802NY
FAN4802LNY
FAN4801MY
FAN4802MY
FAN4802LMY
PFC:PWM Frequency Ratio
1:1
1:1
1:2
1:2
1:1
1:2
1:2
1:1
1:2
1:2
Brownout / 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
0.9V / 1.65V
1.05V / 1.9V
1.05V / 1.9V
0.9V / 1.65V
Range In / Out
N.A
N.A
N.A
N.A
1.95V / 2.45V
1.95V / 2.45V
1.95V / 2.45V
1.95V / 2.45V
1.95V / 2.45V
1.95V / 2.45V
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
2
www.fairchildsemi.com


Part Number FAN4800A
Description PFC/PWM Controller Combination
Maker Fairchild Semiconductor
Total Page 24 Pages
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