www.fairchildsemi.com
FAN4822
ZVS Average Current PFC Controller
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
efficiency 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 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.
Block Diagram
FB
14
2.5V
I
AC
4
V
RMS
5
I
SENSE
3
R
T
C
T
6
V
CCZ
REF
13
REF
+
VEAO
–
+
VEA
1
8
GND
2
IEAO
OVP
V
CC
V
CCZ
13.5V
2.7V
+
–
–
R+
+
FB
IEA
+
12
GAIN
MODULATOR
R–
–
S
I LIMIT
–1V
+
–
Q
R
PFC OUT
11
S
R
Q
Q
ZVS OUT
10
S
R
Q
Q
PWR GND
9
OSC
ZV SENSE
7
–
–
REV. 1.0.1 8/10/01
FAN4822
PRODUCT SPECIFICATION
Pin Configuration
FAN4822
14-Pin DIP (P14)
VEAO
IEAO
I
SENSE
I
AC
V
RMS
R
T
C
T
ZV SENSE
1
2
3
4
5
6
7
14
13
12
11
10
9
8
FB
REF
V
CC
PFC OUT
ZVS OUT
PWR GND
GND
VEAO
IEAO
I
SENSE
I
AC
V
RMS
R
T
C
T
ZV SENSE
N/C
FAN4822
16-Pin SOIC (S16W)
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
FB
REF
V
CC
PFC OUT
ZVS OUT
PWR GND
GND
N/C
TOP VIEW
Pin Description
(Pin numbers is parentheses are for 16-pin package)
Pin
1 (1)
2 (2)
3 (3)
4 (4)
5 (5)
6 (6)
7 (7)
8 (10)
9 (11)
10 (12)
11 (13)
12 (14)
13 (15)
14 (16)
Name
VEAO
IEAO
I
SENSE
I
AC
V
RMS
R
T
C
T
ZV SENSE
GND
PWR GND
ZVS OUT
PFC OUT
V
CC
REF
FB
Function
Transconductance voltage error amplifier output.
Transconductance current error amplifier output.
Current sense input to the PFC current limit comparator.
PFC gain modulator reference input.
Input for RMS line voltage compensation.
Connection for oscillator frequency setting components.
Input to the high speed zero voltage crossing comparator.
Analog signal ground.
Return for the PFC and ZVS driver outputs.
ZVS MOSFET driver output.
PFC MOSFET driver output.
Shunt-regulated supply voltage.
Buffered output for the internal 7.5V reference.
Transconductance voltage error amplifier input.
Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum rat-
ings are stress ratings only and functional device operation is not implied.
Parameter
Shunt Regulator Current (I
CC
)
Peak Driver Output Current
Analog Inputs
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (
θ
JA
)
Plastic DIP
Plastic SOIC
–65
–0.3
Min
Max
55
±500
7
150
150
150
80
110
Unit
mA
mA
V
°C
°C
°C
°C/W
°C/W
2
REV. 1.0.1 8/10/01
PRODUCT SPECIFICATION
FAN4822
Operating Conditions
Temperature Range
FAN4822IX
Min.
–40
Max.
85
Units
°C
Electrical Characteristics
Unless otherwise specified, R
T
= 52.3k
Ω
, C
T
= 470pF, T
A
= Operating Temperature Range (Note 1)
Parameter
Voltage Error Amplifier
Input Voltage Range
Transconductance
Open Loop Gain
PSRR
Output Low
Output High
Source Current
Sink Current
Current Error Amplifier
Input Voltage Range
Transconductance
Input Offset Voltage
Open Loop Gain
PSRR
Output Low
Output High
Source Current
Sink Current
OVP Comparator
Threshold Voltage
Hysteresis
I
SENSE
Comparator
Threshold Voltage
Delay to Output
ZV Sense Comparator
Propagation Delay
Threshold Voltage
Input Capacitance
100mV Overdrive
7.35
7.5
6
50
7.65
ns
V
pF
–0.8
–1.0
150
–1.15
300
V
ns
2.6
80
2.7
120
2.8
150
V
mV
∆
V
IN
= ±0.5V, V
OUT
= 6V
∆
V
IN
= ±0.5V, V
OUT
= 1.5V
6.0
–30
40
V
CCZ
– 3V < V
CC
< V
CCZ
– 0.5V
60
60
V
NON-INV
= V
INV
, IEAO = 3.75V
–1.5
130
195
±3
75
75
0.65
6.7
–80
80
1
2
310
±15
V
µ
mV
dB
dB
V
V
µ
A
µ
A
Ω
∆
V
IN
= ±0.5V, V
OUT
= 6V
∆
V
IN
= ±0.5V, V
OUT
= 1.5V
6.0
–40
40
V
CCZ
– 3V < V
CC
< V
CCZ
– 0.5V
V
NON-INV
= V
INV
, VEAO = 3.75V
Feedback Reference Voltage V
EAO
= V
FB
0
50
2.4
60
60
70
2.5
75
75
0.65
6.7
–80
80
1
7
120
2.6
V
µ
V
dB
dB
V
V
µA
mA
Ω
Conditions
Min.
Typ.
Max.
Units
REV. 1.0.1 8/10/01
3
FAN4822
PRODUCT SPECIFICATION
Electrical Characteristics
(Continued)
Unless otherwise specified, R
T
= 52.3kΩ, C
T
= 470pF, T
A
= Operating Temperature Range (Note 1)
Parameter
Gain Modulator
Gain (Note 2)
I
IAC
= 100mA, V
VRMS
= 0V,
V
FB
= 0V
I
IAC
= 50mA, V
VRMS
= 1.2V,
V
FB
= 0V
I
IAC
= 100
µ
A, V
VRMS
= 1.8V,
V
FB
= 0V
I
IAC
= 100
µ
A, V
VRMS
= 3.3V,
V
FB
= 0V
Bandwidth
Output Voltage
Oscillator
Initial Accuracy
Voltage Stability
Temperature Stability
Total Variation
Ramp Valley to Peak Voltage
Dead Time
C
T
Discharge Current
Reference
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Variation
Long Term Stability
Short Circuit Current
PFC Comparator
Minimum Duty Cycle
Maximum Duty Cycle
MOSFET Driver Outputs
Output Low Voltage
I
OUT
= –20mA
I
OUT
= –100mA
I
OUT
= –10mA, V
CC
= 8V
Output High Voltage
Output Rise/Fall Time
Undervoltage Lockout
Threshold Voltage
Hysteresis
V
CCZ
–
0.9
2.4
V
CCZ
–
0.6
2.9
V
CCZ
–
0.2
3.45
V
V
I
OUT
= 20mA
I
OUT
= 100mA
C
L
= 1000pF
9.5
9
0.4
1.5
0.8
10.3
10.3
40
1.0
3.5
1.5
V
V
V
V
V
ns
V
IEAO
> 6.7V
V
IEAO
< 1.2V
90
95
0
%
%
Line, load, and temperature
T
j
= 125°C, 1000 hours
V
CC
< V
CCZ
– 0.5V, V
REF
= 0V
–15
7.35
5
–40
T
A
= 25°C, I
REF
= 1mA
V
CCZ
– 3V < V
CC
< V
CCZ
– 0.5V
1mA < I
REF
, < 20mA
7.4
7.5
2
2
0.4
7.65
25
–100
7.6
10
15
V
mV
mV
%
V
mV
mA
100
4.5
Line, temperature
72
2.5
300
7.5
450
9.5
T
A
= 25°C
V
CCZ
– 3V < V
CC
< V
CCZ
– 0.5V
74
80
1
2
89
87
kHz
%
%
kHz
V
ns
mA
I
IAC
= 250
µ
A
V
FB
= 0V, V
VRMS
= 1.15V, I
IAC
=
250
µ
A
0.72
0.36
1.20
0.55
0.14
0.51
1.72
0.78
0.20
10
0.8
0.9
0.66
2.24
1.01
0.26
MHz
V
Conditions
Min.
Typ.
Max.
Units
4
REV. 1.0.1 8/10/01
PRODUCT SPECIFICATION
FAN4822
Electrical Characteristics
(Continued)
Unless otherwise specified, R
T
= 52.3kΩ, C
T
= 470pF, T
A
= Operating Temperature Range (Note 1)
Parameter
Supply
Shunt Voltage (V
CCZ
)
Load Regulation
Total Variation
Start-up Current
Operating Current
I
CC
=25mA
25mA < I
CC
< 55mA
Load and temperature
V
CC
< 12.3V
V
CC
= V
CCZ
– 0.5V
12.4
0.7
22
12.8
13.5
±150
14.2
±300
14.6
1.1
28
V
mV
V
mA
mA
Conditions
Min.
Typ.
Max.
Units
Notes
1. Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
2. Gain = K x 5.3 V; K = (I
GAINMOD
– I
OFFSET
) x I
AC
x (V
EAO
– 1.5)–
1
.
REV. 1.0.1 8/10/01
5
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