FAN4802SNY【PDF 1/24 页】IC CTLR PFC/PWM COMBO 16-PDIP

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January 2011

?2008 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN4800A/C, FAN4801/02/02L " Rev. 1.0.3 1

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

? f

RTCT

=4"f

PFC

=4"f

PWM

for FAN4800A and FAN4801

? f

RTCT

=4"f

PFC

=2"f

PWM

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 R

resister from the old value to a higher

resister: between 6MW to 8MW.

2. Change RT/CT pin from the existing values to

=6.8KW and C

=1000pF to have f

PFC

=64KHz,

PWM

=64KHz.

3. VRMS pin needs to be 1.224V at V

=85 V

for

universal input application from line input from

85V

to 270 V

. Both poles for the V

rms

FAN4801/02/02L dont need to substantially slower

than FAN4800; about 5 to 10 times.

4. At full load, the average V

needs to ~4.5V and the

ripple on the V

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

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