ML4802CS datasheet(1/15 Pages) FAIRCHILD

Teilenummer	ML4802CS

Bauteilbeschribung	PFC/PWM Controller Combo with Green Mode

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Hersteller	FAIRCHILD [Fairchild Semiconductor]

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December 2000

PRELIMINARY

ML4802

PFC/PWM Controller Combo with Green Mode

BLOCK DIAGRAM

GENERAL DESCRIPTION

The ML 4802 is a controller for power factor corrected,

switched mode power supplies that offers Green Mode

operation and reduced start-up and operating currents.

Green Mode is an efficiency improving circuit feature

which operates automatically in low power situations.

This feature helps meet the demands of Energy Star™

programs.

Power Factor Correction (PFC) offers the use of lower cost

bulk capacitors, reduces power line loading and stress on

the switching FETs. The ML4802 includes circuits for the

implementation of a leading edge, average current,

“boost” type power factor corrector and a trailing edge

Pulse Width Modulator (PWM).

The PFC frequency of the ML4802 is automatically

synchronized to be one half that of the PWM. This

technique allows the user to design with smaller PWM

components while maintaining the optimum operating

frequency for the PFC. An over-voltage comparator shuts

down the PFC section in the event of a sudden decrease

in load. The PFC section also includes peak current

limiting and brown-out protection.

FEATURES

s

Internally synchronized PFC and PWM in one IC

s

Green Mode maximizes efficiency during low power

standby operation

s

Low supply current

(Start-up 200

µA typ., operating 5.5mA typ.)

s

Average current continuous boost leading edge PFC

s

High efficiency trailing edge PWM can be configured

for current mode operation

s

Reduced ripple current in the storage capacitor

between the PFC and PWM sections

s

PFC overvoltage comparator eliminates output

“runaway” due to load removal

s

Current fed gain modulator for improved noise

immunity

s

Overvoltage protection, UVLO, and soft start

VEAO

IEAO

OSCILLATOR

OVP

PFC ILIMIT

VREF

PULSE WIDTH MODULATOR

POWER FACTOR CORRECTOR

2.5V

+

-

+

7.5V

REFERENCE

VCC

VEA

+

–

IEA

+

-

PFC OUT

2.75V

-1V

PWM OUT

VCC

+

-

1.5V

-

+

2.43V

VFB

-

+

8V

VIN OK

GAIN

MODULATOR

÷2

1.8k

Ω

1.8k

Ω

VLS

1.25V

25µA

-

+

DC ILIMIT

8V

PFC

OUTPUT

DRIVER

PFC

CONTROLLER

DC LIMIT

PWM

OUTPUT

DRIVER

VFB

VDC

GREEN

MODE

CONTROLLER

GREEN

MODE

16

1

13

14

12

11

15

VFB

2

IAC

4

VRMS

3

ISENSE

8

RAMP 1

7

RT/CT

9

RAMP 2

6

VDC

5

SS

REV. 1.0.1 12/12/2000

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