FAN4800AU Fairchild Semiconductor, FAN4800AU Datasheet

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FAN4800AU

Manufacturer Part Number
FAN4800AU
Description
The highly integrated FAN4800AU/CU parts are specially designed for power supplies that consist of boost PFC and PWM
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2011 Fairchild Semiconductor Corporation
FAN4800AU/CU • Rev. 1.0.0
FAN4800AU/CU
PFC/ PWM Controller Combination
Features
Applications
Related Resources
Pin-to-Pin Compatible with ML4800, FAN4800,
CM6800, and CM6800A
PWM Configurable for Current-Mode or
Feed-Forward 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
Line Sagging Protection
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 FAN4800AU
for FAN4800CU
Description
The highly integrated FAN4800AU/CU
specially designed for power supplies that consist of
boost PFC and PWM. They require very few external
components to achieve versatile protections and
compensation. They are available in 16-pin DIP and
SOP packages.
The PWM can be used in current or Voltage Mode. In
Voltage Mode, feed-forward from the PFC output bus
can reduce secondary output ripple.
To evaluate FAN4800AU/CU for replacing existing
FAN4800A/C, FAN4800AS/CS, old version FAN4800
and ML4800 boards, six things must be completed
before the fine-tuning procedure:
1.
2.
3.
4.
5.
6.
There are two differences from FAN4800AS/CS to
FAN4800AU/CU:
Change R
resistor value: 6M to 8M.
Change RT/CT pin from the existing values to
R
f
The VRMS pin needs to be 1.224V at V
universal input application with line input from
85V
Change ISENSE pin filter from the exiting values to
R
At full load, the average V
ripple on V
For the SS pin, the soft-start current has been
reduced to half the FAN4800 capacitor.
Add Line Sagging Protection
Fix Inductance Current Instability during AC Cycle
Drop Test
PWM
T
Filter
=6.8K and C
AC
=64kHz.
=51 and C
to 270 V
AC
VEA
resistor from the old value to a higher
needs to be less than 400mV.
AC
T
.
Filter
=1000pF to have f
=0.01µF for higher bandwidth.
VEA
must be ~4.5V and
October 2011
PFC
www.fairchildsemi.com
=64kHz and
IN
parts are
=85V
AC
for

Related parts for FAN4800AU

FAN4800AU Summary of contents

Page 1

... The PWM can be used in current or Voltage Mode. In Voltage Mode, feed-forward from the PFC output bus can reduce secondary output ripple. To evaluate FAN4800AU/CU for replacing existing FAN4800A/C, FAN4800AS/CS, old version FAN4800 and ML4800 boards, six things must be completed before the fine-tuning procedure: 1 ...

Page 2

... Ordering Information Operating Part Number Temperature Range FAN4800AUN FAN4800CUN -40°C to +105°C FAN4800AUM FAN4800CUM Block Diagram © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 PFC:PWM Frequency Ratio 1:1 16-Pin Dual Inline Package (DIP) 1:2 1:1 16-Pin Small Outline Package (SOP) 1:2 Figure 1. Function Block Diagram ...

Page 3

... RAMP AC 47nF 220nF R Filter R SENSE C IEA1 R IEA R FBPWM R R RAMP RAMP © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0 Boost Boost 1MΩ 3MΩ 10Ω Bulk 3MΩ 1MΩ 10KΩ IAC OPFC VRMS FBPFC C FBPFC ISENSE VEA C VEA1 C VEA2 10Ω ...

Page 4

... Marking Information © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 F – Fairchild Logo Z – Plant Code X – 1-Digit Year Code – Package Type (N:DIP) M – Manufacture Flow Code Figure 4. DIP Top Mark F – Fairchild Logo Z – Plant Code X – 1-Digit Year Code Y – ...

Page 5

... 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. © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 Figure 6. Pin Configuration (Top View) Description is 65µA. AC comparator. ...

Page 6

... 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 © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 Parameter < 50°C A DIP SOP DIP SOP ...

Page 7

... 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 Hysteresis △V RD-FBPFC © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 = 25° =6.8kΩ, and Condition V =V -0.1V, OPFC OPWM DD TH-ON Open ...

Page 8

... SENSE OFFSET PFC I Comparator LIMIT Peak Current Limit Threshold V PFC-ILIMIT Voltage, Cycle-by-Cycle Limit PFC I -Gain Modulator LIMIT △V PK Output © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 (Continued) = 25° =6.8kΩ, and Condition ( =3.75V NONINV INV ...

Page 9

... VRMS Threshold SAG LOW RMS-SAG t SAG Protection Delay SAG 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 © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 (Continued) = 25° =6.8kΩ, and C =1000pF ...

Page 10

... Typical Characteristics Figure 7. I vs. Temperature DD-ST Figure 9. f vs. Temperature OSC Figure 11. V PFC-OVP © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 vs. Temperature 10 Figure 8. V vs. Temperature DD-OVP Figure 10. V vs. Temperature VREF Figure 12. V vs. Temperature REF www.fairchildsemi.com ...

Page 11

... Typical Characteristics Figure 13. Gm vs. Temperature V Figure 15. V PFC-ILIMIT Figure 17. V RMS-UVP © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 vs. Temperature Figure 16. vs. Temperature Figure 18. 11 Figure 14. Gm vs. Temperature I V vs. Temperature PWM-ILIMIT ∆V vs. Temperature RMS-UVP www.fairchildsemi.com ...

Page 12

... Typical Characteristics Figure 19. V GATE-CLAMP-PFC Figure 21. D PFC-MAX Figure 23. I vs. Temperature SS © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 vs. Temperature Figure 20. vs. Temperature 12 V vs. Temperature GATE-CLAMP-PWM Figure 22. D vs. Temperature PWM-MAX Figure 24. V vs. Temperature RMS-SAG www.fairchildsemi.com ...

Page 13

... C DEAD T The dead time should be smaller than 2% of the switching period to minimize line current distortion around the line zero crossing. Figure 25. Oscillator Configuration Figure 26. Timing Diagram © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0 G.PFC V G.PWM V G.PFC ( ...

Page 14

... RMS datasheet), and 140µA is the maximum output current of the gain modulator. Current Control of Boost Stage The FAN4800AU/CU employs two control loops for power factor correction, as shown in Figure 32: a current-control loop and a voltage-control loop. The current-control loop shapes inductor current as shown ...

Page 15

... VRMS pin. Once VRMS pin voltage is lower than 1.05V, the PFC stage is shut down to protect the system FAN4800AU/CU starts up the boost stage once VRMS voltage increases above 1.9V. TriFault Detect™ To improve power supply reliability, reduce system component count, and simplify compliance to UL 1950 safety ...

Page 16

... AC Line Drops Out FAN4800AU/CU is designed such that the operation of PFC part is not perturbed by AC line dropout. Once line voltage disappears, the error amplifier can be saturated, resulting in abnormal current waveforms when the line voltage is recovered if proper preventive measures are not employed. With a limited gain modulator operation, FAN4800AU /CU guarantees stable PFC operation even when AC line is recovered from dropout, as shown in Figure 36 ...

Page 17

... 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’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 A 19.68 18.66 9 ...

Page 18

... 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’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 18 www.fairchildsemi.com ...

Page 19

... Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 19 www.fairchildsemi.com ...

Page 20

... Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 20 www.fairchildsemi.com ...

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