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1366

POWER FACTOR CORRECTOR

STMicroelectronics 

L4981A

®

L4981B

POWER FACTOR CORRECTOR

CONTROL BOOST PWM UP TO 0.99P.F.

LIMIT LINE CURRENT DISTORTION TO < 5%

UNIVERSAL INPUT MAINS

FEED FORWARD LINE AND LOAD REGULA-

TION

AVERAGE CURRENT MODE PWM FOR

MINIMUM NOISE SENSITIVITY

HIGH CURRENT BIPOLAR AND DMOS TO-

TEM POLE OUTPUT

LOW START-UP CURRENT (0.3mA TYP.)

UNDER VOLTAGE LOCKOUT WITH HYS-

TERESIS AND PROGRAMMABLE TURN ON

THRESHOLD

OVERVOLTAGE, OVERCURRENT PROTEC-

TION

PRECISE 2% ON CHIP REFERENCE EX-

TERNALLY AVAILABLE

SOFT START

DESCRIPTION

The L4981 I.C. provides the necessary features

to achieve a very high power factor up to 0.99.

Realized in BCD 60II technology this power factor

corrector (PFC) pre-regulator contains all the con-

BLOCK DIAGRAM

MULTIPOWER BCD TECHNOLOGY

DIP20

SO20

ORDERING NUMBERS: L4981X (DIP20)

L4981XD (SO20)

trol functions for designing a high efficiency-mode

power supply with sinusoidal line current con-

sumption.

The L4981 can be easily used in systems with

mains voltages between 85V to 265V without any

line switch. This new PFC offers the possibility to

work at fixed frequency (L4981A) or modulated

frequency (L4981B) optimizing the size of the in-

November 2001

1/16

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