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PDF FAN4801NY Data sheet ( Hoja de datos )

Número de pieza FAN4801NY
Descripción PFC/PWM Controller Combination
Fabricantes Fairchild Semiconductor 
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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

1 page




FAN4801NY pdf
Block Diagram
Figure 3. FAN4800A/C Function Block Diagram
Figure 4. FAN4801/02/02L Function Block Diagram
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
5
www.fairchildsemi.com

5 Page





FAN4801NY arduino
Electrical Characteristics (Continued)
VDD=15V, TA=25°C, RT=6.8k, CT=1000pF unless noted operating specifications.
Symbol
Parameter
Conditions
PFC ILIMIT Comparator
VPFC-ILIMIT
Peak Current Limit
Threshold Voltage,
Cycle-by-Cycle Limit
Vpk
PFC ILIMIT-Gain Modulator IAC=17.67µA, VRMS=1.08V
Output
VFBPFC=2.25V, at T=25°C
PFC Output Driver
VGATE-CLAMP
Gate Output Clamping
Voltage
VDD=22V
VGATE-L
VGATE-H
tr
tf
DPFC-MAX
DPFC-MIN
Gate Low Voltage
Gate High Voltage
Gate Rising Time
Gate Falling Time
Maximum Duty Cycle
Minimum Duty Cycle
VDD=15V; IO=100mA
VDD=13V; IO=100mA
VDD=15V; CL=4.7nF; O/P=2V to 9V
VDD=15V; CL=4.7nF; O/P=9V to 2V
VIEA<1.2V
VIEA>4.5V
Brownout
VRMS-UVL
VRMS Threshold Low
FAN4800A/C, FAN4801/02
FAN4802L
VRMS-UVH
VRMS Threshold High
FAN4800A/C, FAN4801/02
FAN4802L
VRMS-UVP Hysteresis
FAN4800A/C, FAN4801/02
FAN4802L
tUVP
Under-Voltage Protection
Delay Time
Soft-Start
VSS-MAX
ISS
Maximum Voltage
Soft-Start Current
PWM ILIMIT Comparator
VPWM-ILIMIT Threshold Voltage
tPD Delay to Output
tPWM-Bnk
Leading-Edge Blanking
Time
VDD=15V
Range (FAN4801/02/02L)
VRMS-L
RMS AC Voltage Low
VRMS-H
RMS AC Voltage High
VEA-L
VEA Low
VEA-H
Itc
VEA High
Two-Level Current
When VRMS=1.95V at132VRMS
When VRMS=2.45V at150VRMS
When VVEA=1.95V at 30% Loading,
When VVEA=2.80V at 60% Loading
When VVEA=2.45V at 40% Loading,
When VVEA=3.35V at 70% Loading
FBPFC Two-Level Current
Min. Typ. Max. Units
-1.25 -1.15 -1.05 V
200 mV
13 15 17
V
1.5 V
8V
40 70 120 ns
40 60 110 ns
94 97
%
0%
1.00 1.05 1.10 V
0.85 0.90 0.95 V
1.85 1.90 1.95 V
1.60 1.65 1.70 V
750 850 950 mV
650 750 850 mV
340 410 480 ms
9.5 10.0 10.5 V
10 µA
0.95 1.00 1.05
250
170 250 350
V
ns
ns
1.90 1.95 2.00
2.40 2.45 2.50
1.90 1.95 2.00
V
V
V
2.40 2.45 2.50
18 20 22
V
µA
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
11
www.fairchildsemi.com

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