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 put filter; both the operating frequency modes
●working with an average current mode PWM controller, maintaining sinusoidal line current without
●slope compensation.
●CONTROL BOOST PWM UP TO 0.99P.F.
●LIMIT LINE CURRENT DISTORTION TO < 5%
●UNIVERSAL INPUT MAINS
●FEED FORWARD LINE AND LOAD REGULATION
●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 HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
●OVERVOLTAGE, OVERCURRENT PROTECTION
●PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
●SOFT START
