L6668TR Datasheet PDF - ST Microelectronics

●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