L4981B集成电路（IC）的PFC（功率因数校正）规格书PDF中文资料

L4981B属于集成电路（IC）的PFC（功率因数校正）。由意法半导体集团制造生产的L4981BPFC（功率因数校正）功率因数校正 (PFC) 是用于调整交流电路中的电压和电流之间的相位角，使之趋近于零的半导体器件。不同模式包括平均电流、边界导通、连续导通、临界导通、电流控制式频率折返、不连续和不连续导通，开关频率从 6 kHz 至 1.7 MHz 可调。

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