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参数资料
| 型号： | FAN4822IS |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER, PDSO16 |
| 封装： | PLASTIC, SOIC-16 |
| 文件页数： | 1/10页 |
| 文件大小： | 213K |
| 代理商： | FAN4822IS |
www.fairchildsemi.com
REV. 1.0.0 7/26/01
Features
Average current sensing, continuous boost, leading edge
PFC for low total harmonic distortion and near unity
power factor
Built-in ZVS switch control with fast response for high
efciency at high power levels
Average line voltage compensation with brownout control
Current fed gain modulator improves noise immunity and
provides universal input operation
Overvoltage comparator eliminates output “runaway” due
to load removal
UVLO, current limit, and soft-start
Precision 1.3% reference
General Description
The FAN4822 is a PFC controller designed specically for
high power applications. The controller contains all of the
functions necessary to implement an average current boost
PFC converter, along with a Zero Voltage Switch (ZV S) con-
troller to reduce diode recovery and MOSFET turn-on
losses.
The average current boost PFC circuit provides high power
factor (>98%) and low Total Harmonic Distortion (THD).
Built-in safety features include undervoltage lockout, over-
voltage protection, peak current limiting, and input voltage
brownout protection.
The ZVS control section drives an external ZVS MOSFET
which, combined with a diode and inductor, soft switches the
boost regulator. This technique reduces diode reverse recov-
ery and MOSFET switching losses to reduce EMI and maxi-
mize efciency.
Block Diagram
Q
S
R
–
+
1
14
VEAO
VEA
2.5V
FB
4
IAC
5
VRMS
+
–
3
ISENSE
8
GND
2
IEAO
+
–
IEA
R+
R–
+
–
6
RTCT
OSC
GAIN
MODULATOR
S
R
Q
+
–
2.7V
FB
–1V
12
VCC
VCCZ
13.5V
ZVS OUT
11
Q
S
R
Q
PFC OUT
9
PWR GND
10
OVP
I LIMIT
REF
13
ZV SENSE
7
+
VCCZ
REF
Q
FAN4822
ZVS Average Current PFC Controller
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