FAN4803 Fairchild Semiconductor, FAN4803 Datasheet

FAN4803

Manufacturer Part Number

FAN4803

Description

To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency at light-load conditions

Manufacturer

Fairchild Semiconductor

Datasheets

1.FAN4803CS-2.pdf (12 pages)

2.FAN4803.pdf (12 pages)

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Features

• Internally synchronized PFC and PWM in one 8-pin IC

• Patented one-pin voltage error ampliﬁer with advanced

• Peak or average current, continuous boost, leading edge

• High efﬁciency trailing-edge current mode PWM

• Low supply currents; start-up: 150µA typ., operating:

• Synchronized leading and trailing edge modulation

• Reduces ripple current in the storage capacitor between

• Overvoltage, UVLO, and brownout protection

• PFC V

Block Diagram

FAN4803

8-Pin PFC and PWM Controller Combo

input current shaping technique

PFC (Input Current Shaping Technology)

2mA typ.

the PFC and PWM sections

OVP with PFC Soft Start

VEAO

I SENSE

V DC

I LIMIT

–1V

26k

40k

V REF

ONE PIN ERROR AMPLIFIER

–

PFC I LIMIT

35 A

V CC

1.2V

–

COMP

PFC/PWM UVLO

PFC OFF

–1

–

–4

COMP

PWM – 134kHz

OSCILLATOR

PFC – 67kHz

PWM COMPARATOR

–

COMP

1.5V

30pF

–

DUTY CYCLE

General Description

The FAN4803 is a space-saving controller for power factor

corrected, switched mode power supplies that offers very

low start-up and operating currents.

Power Factor Correction (PFC) offers the use of smaller, lower

cost bulk capacitors, reduces power line loading and stress on

the switching FETs, and results in a power supply fully compli-

ant to IEC1000-3-2 speciﬁcations. The FAN4803 includes

circuits for the implementation of a leading edge, average

current “boost” type PFC and a trailing edge, PWM.

The FAN4803-1’s PFC and PWM operate at the same

frequency, 67kHz. The PFC frequency of the FAN4803-2 is

automatically set at half that of the 134kHz PWM. This

higher frequency allows the user to design with smaller

PWM components while maintaining the optimum operating

frequency for the PFC. An overvoltage comparator shuts

down the PFC section in the event of a sudden decrease in

load. The PFC section also includes peak current limiting for

enhanced system reliability.

DC I LIMIT

LIMIT

V CC

17.5V

–

COMP

16.2V

–

COMP

V CC OVP

CONTROL

LOGIC

PFC

SOFT START

CONTROL

LOGIC

PWM

www.fairchildsemi.com

REF

EDGE PWM

EDGE PFC

TRAILING

LEADING

PWM OUT

PFC OUT

REV. 1.2.3 11/2/04

V REF

GND

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