L6668TR屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開(kāi)關(guān)。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的L6668TRAC DC 轉(zhuǎn)換器，離線開(kāi)關(guān)該系列是元器件級(jí)控制產(chǎn)品，用于構(gòu)建將交流市電轉(zhuǎn)換為直流電（通常電壓大幅降低）的設(shè)備。集成和未集成系統(tǒng)主要開(kāi)關(guān)元件的器件均包括在內(nèi)。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來(lái)實(shí)現(xiàn)此用途，但也有許多專門(mén)用于此用途的庫(kù)存產(chǎn)品，請(qǐng)參見(jiàn)“開(kāi)關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。

描述 Description

L6668 is a current-mode primary controller IC, designed to build single-ended converters.

The IC drives the system at fixed frequency at heavy load and an improved Standby function causes a smooth frequency reduction as the load is progressively reduced. At very light load the device enters a special operating mode (burst-mode with fixed, externally programmed peak current) that, in addition to the on-board high-voltage start-up and the very low quiescent current, helps keep low the consumption from the mains and be compliant with energy saving regulations. To allow meeting compliance with these standards in power-factor-corrected systems too, an interface with the PFC controller is provided that enables to turn off the pre-regulator when the load level falls below a threshold.

General Features

■ MULTIPOWER BCD TECHNOLOGY

■ LOAD-DEPENDENT CURRENT-MODE CONTROL: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)

■ ON-BOARD HIGH-VOLTAGE START-UP

■ IMPROVED STANDBY FUNCTION

■ LOW QUIESCENT CURRENT (< 2 mA)

■ SLOPE COMPENSATION

■ PULSE-BY-PULSE & HICCUP-MODE OCP

■ INTERFACE WITH PFC CONTROLLER

■ DISABLE FUNCTION (ON/OFF CONTROL)

■ LATCHED DISABLE FOR OVP/OTP FUNCTION

■ PROGRAMMABLE SOFT-START

■ 2 PRECISION REFERENCE VOLTAGE EXTERNALLY AVAILABLE

■ ±800 mA TOTEM POLE GATE DRIVER WITH INTERNAL CLAMP AND UVLO PULL-DOWN

■ BLUE ANGEL, ENERGY STAR, EU CODE OF CONDUCT COMPLIANT

■ SO16 PACKAGE ECOPACK?

APPLICATIONS

■ HI-END AC-DC ADAPTERS/CHARGERS FOR NOTEBOOKS.

■ LCD/CRT MONITORS, LCD/CRT TV

■ DIGITAL CONSUMER