FAN4822 Fairchild Semiconductor, FAN4822 Datasheet
FAN4822
Manufacturer Part Number
FAN4822
Description
ZVS Average Current PFC Controller
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN4822.pdf
(10 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
FAN4822IM
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
Company:
Part Number:
FAN4822IN
Manufacturer:
FSC
Quantity:
201
Part Number:
FAN4822IN
Manufacturer:
F
Quantity:
20 000
Features
• Average current sensing, continuous boost, leading edge
• Built-in ZVS switch control with fast response for high
• Average line voltage compensation with brownout control
• Current fed gain modulator improves noise immunity and
• Overvoltage comparator eliminates output “runaway” due
• UVLO, current limit, and soft-start
• Precision 1.3% reference
Block Diagram
FAN4822
ZVS Average Current PFC Controller
PFC for low total harmonic distortion and near unity
power factor
efficiency at high power levels
provides universal input operation
to load removal
14
13
4
5
3
6
7
2.5V
FB
I
V
I
R
REF
ZV SENSE
AC
SENSE
RMS
T
C
T
–
+
MODULATOR
VEAO
VEA
GAIN
1
R+
R–
V
REF
CCZ
8
GND
+
–
IEA
– –
+
2
OSC
IEAO
+
–
General Description
The FAN4822 is a PFC controller designed specifically 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 (ZVS) 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 efficiency.
2.7V
–1V
FB
+
–
+
–
I LIMIT
OVP
S
R
S
R
S
R
www.fairchildsemi.com
Q
Q
Q
Q
Q
V
CCZ
REV. 1.0.1 8/10/01
13.5V
PWR GND
PFC OUT
ZVS OUT
V
CC
12
11
10
9
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