ML4801CP Fairchild Semiconductor, ML4801CP Datasheet

ML4801CP

Manufacturer Part Number

ML4801CP

Description

Power Factor Correction ICs DIP-16

Manufacturer

Fairchild Semiconductor

Datasheets

1.ML4801.pdf (14 pages)

2.ML4801CP.pdf (14 pages)

3.ML4801CP.pdf (14 pages)

Specifications of ML4801CP

Switching Frequency

212 KHz

Maximum Operating Temperature

+ 70 C

Mounting Style

Through Hole

Package / Case

PDIP-16

Minimum Operating Temperature

0 C

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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GENERAL DESCRIPTION

The ML4801 is a controller for power factor corrected,

switched mode power supplies. Key features of this

combined PFC and PWM controller are low start-up and

operating currents. Power Factor Correction (PFC) allows

the use of smaller, lower cost bulk capacitors, reduces

power line loading and stress on the switching FETs, and

results in a power supply that fully complies with

IEC1000-2-3 specifications. The ML4801 includes circuits

for the implementation of a leading edge, average current

“boost” type power factor correction and a trailing edge

pulse width modulator (PWM).

The PFC frequency of the ML4801 is automatically set at

half that of the PWM frequency generated by the internal

oscillator. This technique allows the user to design with

smaller output 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 input voltage brown-

out protection.

BLOCK DIAGRAM

Variable Feedforward PFC/PWM Controller Combo

I AC

V FB

V RMS

I SENSE

RAMP 1

R T C T

RAMP 2

V DC

2.5V

V CC

25µA

VEA

VEAO

MODULATOR

1.25V

GAIN

1.6kΩ

–

IEA

IEAO

OSCILLATOR

2.5V

V FB

POWER FACTOR CORRECTOR

PULSE WIDTH MODULATOR

÷2

V IN OK

DUTY CYCLE

FEATURES

LIMIT

Internally synchronized PFC and PWM in one IC

Low start-up current (200µA typ.)

Low operating current (5.5mA typ.)

Low total harmonic distortion

Reduces ripple current in the storage capacitor

between the PFC and PWM sections

Average current continuous boost leading edge PFC

High efficiency trailing edge PWM optimized for

current mode operation

Current fed gain modulator for improved noise

immunity

Brown-out control, overvoltage protection, UVLO, and

soft start

1.5V

2.75V

-1V

PFC I LIMIT

OVP

DC I LIMIT

V CC

UVLO

REFERENCE

ML4801

7.5V

REV. 1.1 3/9/2001

PRELIMINARY

V CC

PWM OUT

March 2001

PFC OUT

GND

V REF

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