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부품번호 FAN4800A 기능
기능 PFC/PWM Controller Combination
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FAN4800A 데이터시트, 핀배열, 회로
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




FAN4800A pdf, 반도체, 판매, 대치품
Application Diagram
Secondary
VREF
IEA
IAC
ISENSE
VRMS
SS
FBPWM
RT/CT
RAMP
VEA
FBPFC
VREF
VDD
OPFC
OPWM
GND
ILIMIT
FAN4800A/C
FAN4801/02/02L
VREF
VDD
Figure 2. Typical Application Voltage Mode
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
4
www.fairchildsemi.com

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FAN4800A 전자부품, 판매, 대치품
Pin Configuration
Figure 7. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
IEA
IAC
ISENSE
VRMS
SS
FBPWM
RT/CT
RAMP
ILIMIT
GND
OPWM
OPFC
VDD
VREF
FBPFC
VEA
Description
Output of PFC Current Amplifier. The signal from this pin is compared with an internal
sawtooth to determine the pulse width for PFC gate drive.
Input AC Current. For normal operation, this input provides current reference for the multiplier.
The suggested maximum IAC is 100µA.
PFC Current Sense. The non-inverting input of the PFC current amplifier and the output of
multiplier and PFC ILIMIT comparator.
Line-Voltage Detection. Line voltage detection. The pin is used for PFC multiplier.
PWM Soft-Start. During startup, the SS pin charges an external capacitor with a 10µA constant
current source. The voltage on FBPWM is clamped by SS during startup. In the event of a
protection condition occurring and/or PWM disabled, the SS pin is quickly discharged.
PWM Feedback Input. The control input for voltage-loop feedback of PWM stage.
Oscillator RC Timing Connection. Oscillator timing node; timing set by RT and CT.
PWM RAMP Input. In current mode, this pin functions as the current sense input; when in
voltage mode, it is the feed forward sense input from PFC output 380V (feedforward ramp).
Peak Current Limit Setting for PWM. The peak current limits setting for PWM.
Ground.
PWM Gate Drive. The totem-pole output drive for PWM MOSFET. This pin is internally
clamped under 15V to protect the MOSFET.
PFC Gate Drive. The totem pole output drive for PWM MOSFET. This pin is internally clamped
under 15V to protect the MOSFET.
Supply. The power supply pin. The threshold voltages for startup and turn-off are 11V and
9.3V, respectively. The operating current is lower than 10mA.
Reference Voltage. Buffered output for the internal 7.5V reference.
Voltage Feedback Input for PFC. The feedback input for PFC voltage loop. The inverting input
of PFC error amplifier. This pin is connected to the PFC output through a divider network.
Output of PFC Voltage Amplifier. The error amplifier output for PFC voltage feedback loop.
A compensation network is connected between this pin and ground.
© 2008 Fairchild Semiconductor Corporation
FAN4800A/C, FAN4801/02/02L • Rev. 1.0.3
7
www.fairchildsemi.com

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