L4981A_01 STMICROELECTRONICS [STMicroelectronics], L4981A_01 Datasheet
L4981A_01
Manufacturer Part Number
L4981A_01
Description
POWER FACTOR CORRECTOR
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.L4981A_01.pdf
(16 pages)
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L4981A_01L4981AD013TR
Manufacturer:
STMicroelectronics
Quantity:
1 866
Part Number:
L4981A_01L4981AD013TR
Manufacturer:
ST
Quantity:
20 000
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
November 2001
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
®
POWER FACTOR CORRECTOR
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-
MULTIPOWER BCD TECHNOLOGY
ORDERING NUMBERS: L4981X (DIP20)
DIP20
L4981XD (SO20)
L4981A
L4981B
SO20
1/16
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