FAN4800CS Fairchild Semiconductor, FAN4800CS Datasheet

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FAN4800CS

Manufacturer Part Number
FAN4800CS
Description
The highly integrated FAN4800AS/CS/01S/02S parts are specially designed for power supplies that consist of boost PFC and PWM
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2010 Fairchild Semiconductor Corporation
FAN4800AS/CS/01S/02S • Rev. 1.0.1
FAN4800AS/CS/01S/2S
PFC/PWM Controller Combination
Features
Applications
Related Resources
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
f
f
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
AN-8027 - FAN480X PFC+PWM Combination
Controller Application
RTCT
RTCT
=4•f
=4•f
PFC
PFC
=4•f
=2•f
PWM
PWM
for FAN4800AS/01S
for FAN4800CS/02S
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
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
FAN4800,
operation current that saves power consumption in
external
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.
2.
3.
4.
5.
There are two differences from FAN4800A/C/01/02 to
FAN4800AS/CS/01S/02S:
1.
2.
Change R
resister: between 6MΩ to 8MΩ.
Change RT/CT pin from the existing values to
R
f
The VRMS pin needs to be 1.224V at V
for universal input application from line input from
85V
At full load, the average V
and the ripple of V
400mV.
For the Soft-Start pin, the soft-start current has
been reduced to half the FAN4800 capacitor.
Under-voltage
extended to one second.
PWM gate clamp voltage is raised to 19V.
PWM
T
=6.8kΩ and C
AC
=64kHz.
devices.
to 270V
with
FAN4800AS/CS/01S/02S
AC
to
resister from the old value to a higher
AC
older
achieve
.
T
protection
=1000pF to have f
FAN4800AS/CS/01S/02S
VEA
productions,
versatile
needs to be less than
VEA
debounce
needs to be ~4.5V
December 2010
PFC
protections
ML4800
have
www.fairchildsemi.com
=64kHz and
IN
time
=85 V
lower
have
and
AC
is
/

Related parts for FAN4800CS

FAN4800CS Summary of contents

Page 1

... Improved Efficiency at Light Load f =4•f =4•f for FAN4800AS/01S RTCT PFC PWM f =4•f =2•f for FAN4800CS/02S RTCT PFC PWM Applications Desktop PC Power Supply Internet Server Power Supply LCD TV, Monitor Power Supply UPS Battery Charger DC Motor Power Supply Monitor Power Supply ...

Page 2

... Ordering Information Part Number Operating Temperature Range FAN4800ASNY -40°C to +105°C FAN4800ASMY -40°C to +105°C FAN4800CSNY -40°C to +105°C FAN4800CSMY -40°C to +105°C FAN4801SNY -40°C to +105°C FAN4801SMY -40°C to +105°C FAN4802SNY -40°C to +105°C FAN4802SMY -40°C to +105°C Application Diagram © ...

Page 3

... Application Diagram © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 VEA IEA FBPFC IAC VREF ISENSE VRMS VDD SS OPFC FBPWM OPWM RT/CT GND RAMP ILIMIT VREF VREF Figure 2. Typical Application, Voltage Mode 3 VDD www.fairchildsemi.com ...

Page 4

... Block Diagram © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Figure 3. FAN4800AS/CS Function Block Diagram Figure 4. FAN4801S/02S Function Block Diagram 4 www.fairchildsemi.com ...

Page 5

... Marking Information © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 – Fairchild Logo F Z – Plant Code X – 1-Digit Year Code – Package Type (N:DIP) P – Y: Green Package M Figure 5. DIP Top Mark – Fairchild Logo F Z – Plant Code X – ...

Page 6

... PFC error amplifier. This pin is connected to the PFC output through a divider network. Output of PFC Voltage Amplifier. The error amplifier output for PFC voltage feedback loop. 16 VEA A compensation network is connected between this pin and ground. © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Figure 7. Pin Configuration (Top View) 6 and C ...

Page 7

... 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 T Operating Ambient Temperature A © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Parameter < 50°C A DIP SOP ...

Page 8

... Low-Power Detect Comparator V VEA Voltage OFF OPFC VEAOFF V OK Comparator IN Voltage Level on FBPFC to V RD-FBPFC Enable OPWM During Startup ΔV Hysteresis RD-FBPFC © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 = 25° =6.8kΩ, and Conditions V =V -0.1V; OPFC OPWM ...

Page 9

... OFFSET PFC I Comparator LIMIT Peak Current Limit Threshold V PFC-ILIMIT Voltage, Cycle-by-Cycle Limit ΔV PFC I -Gain Modulator Output LIMIT PK © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 (Continued) = 25° =6.8kΩ, and Conditions ( NONINV ...

Page 10

... Maximum Duty Cycle PWM-MAX V PWM Comparator Level Shift PWM-LS Notes: 3. This parameter, although guaranteed by design, is not 100% production tested. 4. This GAIN is the maximum gain of modulation with a given V © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 (Continued) = 25° =6.8kΩ, and C =1000pF ...

Page 11

... Figure 14. Gm vs. Temperature V -1.177 -1.178 -1.179 -1.180 -1.181 -1.182 -1.183 -40 -25 - Figure 16. V PFC-ILIMIT © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 28.04 28.02 28.00 27.98 27.96 27.94 27.92 27.90 27.88 27.86 50℃ 65℃ 80℃ 95℃ 110℃ 125℃ -40℃ -25℃ -10℃ 7.520 7.515 7.510 7.505 7 ...

Page 12

... Figure 24. I vs. Temperature SS © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 867.5 867.0 866.5 866.0 865.5 865.0 864.5 864.0 863.5 863.0 862.5 862.0 50℃ 65℃ 80℃ 95℃ 110℃ 125℃ -40℃ -25℃ -10℃ ...

Page 13

... PFC from the power line. The general form of the output of the gain modulator is: © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 I GAINMOD Note that the output current of the gain modulator is limited around 159μ ...

Page 14

... PFC Brownout The AC UVP comparator monitors the AC input voltage. The PFC is disabled as AC input lowers, causing V be less than 1.05V. © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Error Amplifier Compensation The PWM loading of the PFC can be modeled as a negative resistor because an increase in the input voltage to the PWM causes a decrease in the input current ...

Page 15

... © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Pulse Width Modulator (PWM) The operation of the PWM section is straightforward, but there are several points that should be noted. Foremost among these is the inherent synchronization of PWM with the PFC section of the device, from which it also derives its basic timing ...

Page 16

... FAN4800AS/CS/01S/02S system. The bootstrap winding can be taped from the PFC boost choke or the transformer of the DC-to-DC stage. © 2010 Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 Leading/Trailing Edge Modulation Conventional PWM techniques employ trailing-edge modulation, in which the switch turns on right after the trailing edge of the system clock ...

Page 17

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 18

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 19

... Fairchild Semiconductor Corporation FAN4800AS/CS/01S/02S • Rev. 1.0.1 19 www.fairchildsemi.com ...

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