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 control 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 TOTEM 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

参考价格：4.5767

型号：L4981A 品牌：STMICROELECTRONICS 说明：L4981A多少钱，2026年最近一个月行情走势，L4981A批发/采购报价，L4981A行情走势销售排行榜，L4981A报价。