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  • 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.
    The IC includes also a programmable soft-start, slope compensation for stable operation at duty cycles greater then 50%, a disable function, a leading edge blanking on current sense to improve noise immunity, latched disable for OVP or OTP shutdown and an effective two-level OCP able to protect the system even in case the secondary diode fails short.

    Key Features

    • LATCHED DISABLE FOR OVP/OTP FUNCTION
    • DISABLE FUNCTION (ON/OFF CONTROL)
    • 2% PRECISION REFERENCE VOLTAGE EXTERNALLY AVAILABLE
    • PROGRAMMABLE SOFT-START
    • BLUE ANGEL, ENERGY STAR, EU CODE OF CONDUCT COMPLIANT
    • ±800 mA TOTEM POLE GATE DRIVER WITH INTERNAL CLAMP AND UVLO PULL-DOWN
    • SO16 PACKAGE ECOPACK®
    • PULSE-BY-PULSE & HICCUP-MODE OCP
    • SLOPE COMPENSATION
    • MULTIPOWER BCD TECHNOLOGY
    • ON-BOARD HIGH-VOLTAGE START-UP
    • LOAD-DEPENDENT CURRENT-MODE CONTROL: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)
    • LOW QUIESCENT CURRENT (< 2 mA)
    • INTERFACE WITH PFC CONTROLLER
    • IMPROVED STANDBY FUNCTION

Recommended for you

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS4310
      Smart primary controller
      4.2
      712.99 KB
      PDF
      DS4310

      Smart primary controller

    • Description Version Size Action
      AN2432
      EVALSTSR30-60W: 60W AC-DC adapter with synchronous rectification using L6668 and STSR30
      2.2
      630.68 KB
      PDF
      AN2242
      Reference design: high performance, L6668-based flyback converter for set-top boxes and PVRs
      1.4
      565.3 KB
      PDF
      AN2600
      SMPS for high-end PVR based on L6668
      1.2
      568.5 KB
      PDF
      AN2432

      EVALSTSR30-60W: 60W AC-DC adapter with synchronous rectification using L6668 and STSR30

      AN2242

      Reference design: high performance, L6668-based flyback converter for set-top boxes and PVRs

      AN2600

      SMPS for high-end PVR based on L6668

    • Description Version Size Action
      DT0118
      A Procedure for Restoring Bootloader Functionality to the STNRG388A
      1.0
      367.56 KB
      PDF
      DT0118

      A Procedure for Restoring Bootloader Functionality to the STNRG388A

Presentations & Training Material

    • Description Version Size Action
      Primary side regulation controllers portfolio
      1.1 MB
      PDF

      Primary side regulation controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Power Management Guide 07.2020
      7.12 MB
      PDF

      Electric vehicle (EV) ecosystem

      Power Management Guide

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6668
Active
SO-16 Industrial Ecopack2
L6668TR
Active
SO-16 Industrial Ecopack2

L6668

Package:

SO-16

Material Declaration**:

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6668TR

Package:

SO-16

Material Declaration**:

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L6668 No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube SO-16 - - PHILIPPINES 0.8544 / 1k
L6668TR Available at 1 distributors

Distributor availability ofL6668TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2498 1 Order Now

Distributor reported inventory date: 2020-08-14

Distributor Name

MOUSER

Stock

2498

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-14

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel SO-16 - - PHILIPPINES 0.8544 / 1k

L6668

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.8544 / 1k

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.8544 / 1k

Country of Origin

PHILIPPINES

L6668TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.8544 / 1k

Distributor availability ofL6668TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2498 1 Order Now

Distributor reported inventory date: 2020-08-14

Distributor Name

MOUSER

Stock

2498

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-14

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.8544 / 1k

Country of Origin

PHILIPPINES

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors