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PDF FAN4810 Data sheet ( Hoja de datos )
| Número de pieza | FAN4810 | |
| Descripción | Power Factor Correction Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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FAN4810
Power Factor Correction Controller
www.fairchildsemi.com
Features
• TriFault Detect™ for UL1950 compliance and enhanced
safety
• Slew rate enhanced transconductance error amplifier for
ultra-fast PFC response
• Low power: 200µA startup current, 5.5mA operating
current
• Low total harmonic distortion, high PF
• Average current, continuous boost leading edge PFC
• Current fed gain modulator for improved noise immunity
• Overvoltage and brown-out protection, UVLO, and soft
start
• Synchronized clock output
General Description
The FAN4810 is a controller for power factor corrected,
switched mode power supplies. The FAN4810 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and results in a
power supply that fully complies with IEC1000-3-2 specifi-
cation. It also includes a TriFault Detect™ function to help
ensure that no unsafe conditions will result from single
component failure in the PFC. Gate-driver with 1A
capability minimizes the need for external driver circuit.
Low power requirements improve efficiency and reduce
component costs. The PFC also includes peak current
limiting, input voltage brownout protection and a over-
voltage comparator shuts down the PFC section in the event
of a sudden decrease in load. The clock-out signal can be
used to synchronize down-stream PWM stages in order to
reduce system noise.
Block Diagram
16
VEAO
1
IEAO
VFB
15
2.5V
IAC
2
VRMS
4
ISENSE
3
VEA
–
+
3.6kΩ IEA
+
-
GAIN
MODULATOR
3.6kΩ
POWER FACTOR CORRECTOR
0.5V
+
TRI-FAULT
+
– 2.75V
OVP
+
–
– -1V +
–
PFC ILIMIT
RAMP 1
7
OSCILLATOR
DUTY CYCLE
8 LIMIT
VCC
17V
13
VCC
7.5V
REFERENCE
VREF
14
SQ
RQ
SQ
PFC OUT
12
RQ
6
VCC
25µA
5
CLKSD
9 VREF
1.25V
+
–
VFB
2.45V
VIN OK
–
+
VCC
SQ
RQ
UVLO
CLKOUT
11
10
REV. 1.0.12 9/24/03
1 page  
PRODUCT SPECIFICATION
FAN4810
Electrical Characteristics(Continued)
Unless otherwise specified, VCC = 15V, RT = 52.3kΩ, CT = 470pF, TA = Operating Temperature Range (Note 1)
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Temperature Stability
Total Variation
Line, Load, Temp
0.4 %
7.35 7.65 V
PFC
Long Term Stability
TJ = 125°C, 1000 Hours
5 25 mV
Minimum Duty Cycle
Maximum Duty Cycle
Output Low Voltage
Output High Voltage
Clock
Rise/Fall Time
Duty Cycle
VIEAO > 4.0V
VIEAO < 1.2V
IOUT = -20mA
IOUT = -100mA
IOUT = 10mA, VCC = 9V
IOUT = 20mA
IOUT = 100mA
CL = 1000pF
90
VCC - 0.8V
VCC - 2V
95
0.4
0.7
0.4
50
0
0.8
2.0
0.8
%
%
V
V
V
V
V
ns
45 47 50 %
Supply
Start-up Current
Operating Current
Undervoltage Lockout
Threshold
VCC = 12V, CL = 0
14V, CL = 0
200 350 µA
5.5 7 mA
12.4 13 13.6 V
Undervoltage Lockout
Hysteresis
2.5 2.8 3.1 V
Notes
1. Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
2. Includes all bias currents to other circuits connected to the VFB pin.
3. Gain = K x 5.3V; K = (IGAINMOD - IOFFSET) x [IAC (VEAO - 0.625)]-1; VEAOMAX=5V.
REV. 1.0.12 9/24/03
5
5 Page 
PRODUCT SPECIFICATION
L F1 3.15A
AC INPUT
85 TO 260 V
N
KBLD6
~+
BR1
~-
3.1mH
L1
IN5406
15L9R482 D2
D1
+
+385 V
FAN4810
ISENSE
+
RAMP1
R31 100Ω
+
15V
Zener
(not used)
C7
1.5nF
71.5KΩ R12
C6
1 IEAO VEAO 16
2 IAC
FB 15
3 ISENSE REF 14
4 VRMS
VCC 13
5 CLKSD
V01 12
6 CLK OUT 11
7 RAMP1 GND 10
8 U1 GND 9
FAN4810
D3
C19
1.0µF
C20
1.0µF
L1
CLK OUT
VCC
REF
Figure 4. 125W Power Factor Corrected Power Supply Using AN42046
REV. 1.0.12 9/24/03
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FAN4810.PDF ] | |
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