FAN4800CU Fairchild Semiconductor, FAN4800CU Datasheet

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FAN4800CU

Manufacturer Part Number
FAN4800CU
Description
The highly integrated FAN4800A/C and FAN4801/02/02L 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 FAN4800CU

FAN4800CU Summary of contents

Page 1

... Line Sagging Protection  f =4•f =4•f for FAN4800AU RTCT PFC PWM  f =4•f =2•f for FAN4800CU RTCT PFC PWM Applications  Desktop PC Power Supply  Internet Server Power Supply  LCD TV/ Monitor Power Supply  UPS  Battery Charger  ...

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 ...

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. ...

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 ...

Page 7

... OVP DD-OVP DD V OVP Hysteresis △V DD-OVP DD Oscillator f RT/CT Frequency OSC-RT/CT PFC & PWM Frequency f OSC FAN4800CU PWM Frequency (3) f Voltage Stability DV f Temperature Stability DT f Total Variation (PFC & PWM Ramp Voltage RV I Discharge Current OSC-DIS f Frequency Range ...

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 ...

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

... Figure 25. The operation frequency of PFC and PWM stage is 1/4 of oscillator frequency. (For FAN4800CU, the operation frequencies for PFC and PWM stages are 1/4 and 1/2 of oscillator frequency, respectively). The dead time for the PFC gate drive signal is determined by:  ...

Page 14

... Figure 31. V According to the PFC Operation RMS © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 The rectified sinusoidal signal is obtained by the current flowing into the IAC pin. The resistor R large enough to prevent saturation of the gain ...

Page 15

... I , which provides cycle-by-cycle current limiting, is LIMIT typically connected to RAMP in such applications. © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 For Voltage-Mode operation, RAMP can be connected to a separate RC timing network to generate a voltage ramp against which the FBPWM voltage is compared. Under these conditions, the voltage feed-forward from the PFC bus can be used for better line transient response ...

Page 16

... V BPFC IN-OFF Figure 38. Once line sag protection is triggered, the PWM and the PFC stop operation until V above 1.9V. © 2011 Fairchild Semiconductor Corporation FAN4800AU/CU • Rev. 1.0.0 Figure 37. The First Condition of Sag Protection OK IN Figure 38. The Second condition of Sag Protection (0.85V) for longer (0 ...

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 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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