●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
