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PDF FAN4822 Data sheet ( Hoja de datos )
| Número de pieza | FAN4822 | |
| Descripción | ZVS Average Current PFC Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN4822 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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FAN4822
ZVS Average Current PFC Controller
www.fairchildsemi.com
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
1
VEAO
– VEA
8
GND
2.5V +
R+
IAC
4
VRMS
5
ISENSE
3
GAIN
MODULATOR
R–
IEA
+
–
2
IEAO
+
–
RTCT
6
REF
13
VCCZ
REF
OSC
ZV SENSE
7
+
––
FB
2.7V
OVP
+
–
I LIMIT
–1V +
–
VCCZ
13.5V
VCC
12
SQ
R
SQ
RQ
SQ
RQ
PFC OUT
11
ZVS OUT
10
PWR GND
9
REV. 1.0.1 8/10/01
1 page  
PRODUCT SPECIFICATION
FAN4822
Electrical Characteristics (Continued)
Unless otherwise specified, RT = 52.3kΩ, CT = 470pF, TA = Operating Temperature Range (Note 1)
Parameter
Conditions
Min.
Typ.
Supply
Shunt Voltage (VCCZ)
Load Regulation
Total Variation
ICC =25mA
25mA < ICC < 55mA
Load and temperature
12.8 13.5
±150
12.4
Start-up Current
Operating Current
VCC < 12.3V
VCC = VCCZ – 0.5V
0.7
22
Notes
1. Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
2. Gain = K x 5.3 V; K = (IGAINMOD – IOFFSET) x IAC x (VEAO – 1.5)–1.
Max.
14.2
±300
14.6
1.1
28
Units
V
mV
V
mA
mA
REV. 1.0.1 8/10/01
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet FAN4822.PDF ] | |
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