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FAN4810
Power Factor Correction Controller

Features
TriFault DetectTM for UL1950 compliance and enhanced safety Slew rate enhanced transconductance error amplifier for ultra-fast PFC response Low power: 200 A 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 specification. It also includes a TriFault DetectTM 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 overvoltage 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 VFB 15 2.5V IAC 2 VRMS 4 ISENSE 3 RAMP 1 7 OSCILLATOR R Q GAIN MODULATOR 3.6k VEA

1 IEAO POWER FACTOR CORRECTOR 0.5V 3.6k
-

13 VCC OVP 2.75V

TRI-FAULT

VCC 17V 7.5V REFERENCE S Q VREF 14

IEA

-1V

R S

Q PFC OUT Q 12

PFC ILIMIT

8

DUTY CYCLE LIMIT

6

1.25V VCC 25 A

CLKOUT S VFB 2.45V

Q

VIN OK R Q

11

5 CLKSD 9 VREF

10

VCC

UVLO

REV. 1.0.12 9/24/03

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FAN4810 DATASHEET