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FAN4800AS 데이터시트 PDF




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부품번호 FAN4800AS 기능
기능 PFC/PWM Controller Combination
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FAN4800AS 데이터시트, 핀배열, 회로
January 2014
FAN4800AS/CS/01S/2S
PFC/PWM Controller Combination
Features
Pin-to-Pin Compatible with ML4800 and FAN4800
and CM6800 and CM6800A
PWM Configurable for Current Mode or
Feedforward Voltage-Mode Operation
Internally Synchronized Leading-Edge PFC and
Trailing-Edge PWM in One IC
Low Operating Current
Innovative Switching-Charge Multiplier Divider
Average-Current Mode for Input-Current Shaping
PFC Over-Voltage and Under-Voltage Protections
PFC Feedback Open-Loop Protection
Cycle-by-Cycle Current Limiting for PFC/PWM
Power-on Sequence Control and Soft-Start
Brownout Protection
Interleaved PFC/PWM Switching
Improved Efficiency at Light Load
fRTCT=4•fPFC=4•fPWM for FAN4800AS/01S
fRTCT=4•fPFC=2•fPWM for FAN4800CS/02S
Applications
Desktop PC Power Supply
Internet Server Power Supply
LCD TV, Monitor Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
Related Resources
AN-8027 - FAN480X PFC+PWM Combination
Controller Application
© 2010 Fairchild Semiconductor Corporation
FAN4800AS/CS/01S/02S • Rev. 1.0.2
Description
The highly integrated FAN4800AS/CS/01S/02S parts
are specially designed for power supplies that consist of
boost PFC and PWM. They require very few external
components to achieve versatile protections /
compensation. They are available in 16-pin DIP and
SOP packages.
The PWM can be used in either current or voltage
mode. In voltage mode, feed-forward from the PFC
output bus can reduce the secondary output ripple.
Compared with older productions, ML4800 and
FAN4800, FAN4800AS/CS/01S/02S have lower
operation current that saves power consumption in
external devices. FAN4800AS/CS/01S/02S have
accurate 49.9% maximum duty of PWM that makes the
hold-up time longer. Brownout protection and PFC soft-
start functions available in this series are not available in
ML4800 and FAN4800.
To evaluate FAN4800AS/CS/01S/02S for replacing
existing FAN4800 and ML4800 boards, five things must
be completed before the fine-tuning procedure:
1. Change RAC resister from the old value to a higher
resister: between 6 MΩ to 8 MΩ.
2. Change RT/CT pin from the existing values to
RT=6.8kΩ and CT=1000 pF to have fPFC=64 kHz
and fPWM=64 kHz.
3. The VRMS pin needs to be 1.224 V at VIN=85 VAC
for universal input application from line input from
85 VAC to 270 VAC.
4. At full load, the average VVEA needs to be ~4.5 V
and the ripple of VVEA needs to be less than
400 mV.
5. For the Soft-Start pin, the soft-start current has
been reduced to half the FAN4800 capacitor.
There are two differences from FAN4800A/C/01/02 to
FAN4800AS/CS/01S/02S:
1. Under-voltage protection debounce time is
extended to one second.
2. PWM gate clamp voltage is raised to 19 V.
www.fairchildsemi.com




FAN4800AS pdf, 반도체, 판매, 대치품
Block Diagram
VEA 16
IEA 1
FBPFC 15
IAC 2
VRMS 4
ISENSE 3
2.5V
0.3V
Low Power
Detect Comparator
gmv
Rmul
gmi
Gain
Modulator
Rmul
RT/CT 7
RAMP 8
FBPWM 6
VDD
10µA 300
SS 5
ILIMIT 9
VREF
300
1.5V
OSCILLATOR
0.5V
VDD
27V/28V
2.5V/2.75V
-1.15V
PFC UVP
VDD OVP
PFC OVP
PFC ILIMIT
1.05V/1.9V
VRMS
AC UVP
DUTY CYCLE
LIMIT
1.15V/2.4V
FBPFC
VIN OK
1V
S SET Q
R CLR Q
S SET Q
R CLR Q
VDD 13
7.5V
REFERENCE
VREF
14
OPFC
12
VGATE-CLAMP
S SET Q
R CLR Q
OPWM
11
VGATE-CLAMP
GND 10
VDD UVLO
Figure 3. FAN4800AS/CS Function Block Diagram
VEA 16
IEA 1
FBPFC 15
IAC 2
VRMS 4
ISENSE 3
2.5V
0.3V
Low Power
Detect Comparator
gmv
Rmul
Range
Gain
Modulator
Rmul
gmi
0.5V
VDD
27V/28V
2.5V/2.75V
-1.15V
PFC UVP
VDD OVP
PFC OVP
PFC ILIMIT
1.05V/1.9V
VRMS
AC UVP
S SET Q
R CLR Q
S SET Q
R CLR Q
VDD 13
7.5V
REFERENCE
VREF
14
OPFC
12
VGATE-CLAMP
RT/CT 7
RAMP 8
FBPWM 6
VDD
10µA 300
SS 5
ILIMIT 9
VREF
300
1.5V
OSCILLATOR
DUTY CYCLE
LIMIT
1.15V/2.4V
FBPFC
VIN OK
1V
S SET Q
R CLR Q
OPWM
11
VGATE-CLAMP
GND 10
VDD UVLO
Figure 4. FAN4801S/02S Function Block Diagram
© 2010 Fairchild Semiconductor Corporation
FAN4800AS/CS/01S/02S • Rev. 1.0.2
4
www.fairchildsemi.com

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FAN4800AS 전자부품, 판매, 대치품
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Min. Max. Unit
VDD
VH
VL
VIEA
VN
IAC
IREF
IPFC-OUT
IPWM-OUT
PD
ΘJA
ΘJC
TJ
TSTG
TL
ESD
DC Supply Voltage
SS, FBPWM, RAMP, OPWM, OPFC, VREF
IAC, VRMS, RT/CT, ILIMIT, FBPFC, VEA
IEA
ISENSE
Input AC Current
VREF Output Current
Peak PFC OUT Current, Source or Sink
Peak PWM OUT Current, Source or Sink
Power Dissipation TA < 50°C
Thermal Resistance (Junction-to-Air)
DIP
SOP
Thermal Resistance (Junction-to-Case)
DIP
SOP
Operating Junction Temperature
Storage Temperature Range
Lead Temperature(Soldering)
Electrostatic Discharge Capability
Human Body Model
Charged Device Model
30 V
-0.3 30.0
V
-0.3 7.0
V
0 VVREF+0.3
-5.0 0.7
V
V
1 mA
5 mA
0.5 A
0.5 A
800 mW
80.80
104.10
°C/W
35.38
40.41
°C/W
-40 +125
°C
-55 +150
°C
+260
°C
5.0
kV
1.5
Notes:
1. All voltage values, except differential voltage, are given with respect to GND pin.
2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
TA Operating Ambient Temperature
Min.
-40
Typ.
Max.
+105
Unit
°C
© 2010 Fairchild Semiconductor Corporation
FAN4800AS/CS/01S/02S • Rev. 1.0.2
7
www.fairchildsemi.com

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