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FAN4800AU

Description
PFC/ PWM Controller Combination
File Size993KB,20 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
Download Datasheet View All

FAN4800AU Overview

PFC/ PWM Controller Combination

FAN4800AU/CU — PFC/ PWM Controller Combination
October 2011
FAN4800AU/CU
PFC/ PWM Controller Combination
Features
Pin-to-Pin Compatible with ML4800, FAN4800,
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
Cycle-by-Cycle Current Limiting for PFC/PWM
Power-on Sequence Control and Soft-Start
Line Sagging Protection
f
RTCT
=4•f
PFC
=4•f
PWM
for FAN4800AU
f
RTCT
=4•f
PFC
=2•f
PWM
for FAN4800CU
3.
Description
The highly integrated FAN4800AU/CU parts are
specially designed for power supplies that consist of
boost PFC and PWM. They require very few external
components to achieve versatile protections and
compensation. They are available in 16-pin DIP and
SOP packages.
The PWM can be used in current or Voltage Mode. In
Voltage Mode, feed-forward from the PFC output bus
can reduce secondary output ripple.
To evaluate FAN4800AU/CU for replacing existing
FAN4800A/C, FAN4800AS/CS, old version FAN4800
and ML4800 boards, six things must be completed
before the fine-tuning procedure:
1.
2.
Change R
AC
resistor from the old value to a higher
resistor value: 6M to 8M.
Change RT/CT pin from the existing values to
R
T
=6.8K and C
T
=1000pF to have f
PFC
=64kHz and
f
PWM
=64kHz.
The VRMS pin needs to be 1.224V at V
IN
=85V
AC
for
universal input application with line input from
85V
AC
to 270 V
AC
.
Change ISENSE pin filter from the exiting values to
R
Filter
=51 and C
Filter
=0.01µF for higher bandwidth.
At full load, the average V
VEA
must be ~4.5V and
ripple on V
VEA
needs to be less than 400mV.
For the SS 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
6.
4.
5.
There are two differences from FAN4800AS/CS to
FAN4800AU/CU:
Add Line Sagging Protection
Fix Inductance Current Instability during AC Cycle
Drop Test
Related Resources
AN-8027 — FAN480X PFC+PWM Combination
Controller Application
© 2011 Fairchild Semiconductor Corporation
FAN4800AU/CU • Rev. 1.0.0
www.fairchildsemi.com
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