L4981AD datasheet(1/17 Pages) STMICROELECTRONICS

Il numero della parte	L4981AD

Spiegazioni elettronici	POWER FACTOR CORRECTOR

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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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-

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-

September 1998

®

BLOCK DIAGRAM

ORDERING NUMBERS: L4981X (DIP20)

L4981XD (SO20)

DIP20

SO20

MULTIPOWER BCD TECHNOLOGY

1/17

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