Green-Mode PWM Controller for Flyback Converter, Programmable Frequency 50KHz ~ 80KHz

Not Recommended For New Design as of 23-Oct-2013

    This highly integrated PWM controller provides several special enhancements designed to meet the low standby power needs of low-power SMPS. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to meet even the strictest power conservation requirements.      The BiCMOS fabrication process enables reducing the start-up current to 10µA and the operating current to 2.5mA. To further improve power conservation, a large start-up resistance can be used. Built-in synchronized slope compensation ensures the stability of peak current mode control. Proprietary internal compensation provides a constant output power limit over a universal AC input range (90VAC to 264VAC). Pulse-by-pulse current limiting ensures safe operation even during short-circuits.      To protect the external power MOSFET from being damaged by supply over-voltage events, the SG6858’s output driver is clamped at 17V. SG6858 controllers can be used to improve the performance and reduce the production cost of power supplies and can replace linear and RCC-mode power adapters. It is available in 8-pin DIP and 6-pin SSOT-26 packages.


    • Green-Mode PWM
    • Supports the "Blue Angel" Standard
    • Low Startup Current: 10µA (Maximum)
    • Low Operating Current: 2.5mA
    • Leading-Edge Blanking (LEB)
    • Constant Output Power Limit
    • Built-in Synchronized Slope Compensation
    • Current-Mode Operation
    • Cycle-by-Cycle Current Limiting
    • Under-Voltage Lockout (UVLO)
    • Programmable PWM Frequency
    • VDD Over-Voltage Protection with Auto-Restart
    • Gate Output Voltage Clamped at 17V
    • Few External Components Required
    • SSOT-26 and DIP-8 Packages Available
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    Product Product &
    Eco Status
    Replacement Part Number Packing Method Convention Package Marking
    SG6858TZ Not Recommended For New Design as of 23-Oct-2013
    Green as of Jul 2011

    SSOT 6L  -  Details
    0.97 x 4.22 x 1.6mm,  TAPE REEL

    PDF SSOT 6L  Drawing
    Last Update: May 2015 PDF SOT Tape and Reel Packing Drawing
    Last Update: Sep 2015
    Line 1&E (Space)
    &E (Space)
    &Y (Binary Calendar Year Coding)

    Line 2&O (Plant Code)
    AAIB&C (Die Run)

    Line 3&. (Pin One)
    &O (Plant Code)
    &E (Space)
    &V (Eight Week Binary Datecoding)

    FIT 2.4 @55°C
    change temp

    ESD (HBM) 3000V

    RƟJA 82.5°C/W

    Moisture Sensitivity Level (MSL) 1

    Max Reflow Temp 260

    PDF RoHS IPC1752
    XML RoHS IPC1752
    SG6858DZ Not Recommended For New Design as of 18-Apr-2008
    Green as of Aug 2012

    MDIP 8L  -  Details

    PDF MDIP 8L  Drawing
    Last Update: Nov 2015 PDF DIP 8TUBE Packing Drawing
    Last Update: Oct 2015 PDF DIP 8 tube packing
    Last Update: Oct 2015 PDF DIP 8 Tube Packing Drawing
    Last Update: May 2014 PDF DIP 8 Tube Packing Drawing
    Last Update: May 2014
    Line 1SG6858DZ

    Line 2B3&6&3 (3-Digit Date Code)
    &Z (Plant Code)

    FIT 2.4 @55°C
    change temp

    ESD (HBM) 3000V

    RƟJA 82.5°C/W

    PDF RoHS IPC1752
    XML RoHS IPC1752

    If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
    * Click here for further top mark packaging information for SG6858

    • DVD
    • External AC-DC Merchant Power Supply - Wireless Communications
    • Notebook PC
    • STB
    • Wireless LAN Access Point/Router
    Application Note Description
    AN-6858 PDFApplying SG6858 to Control a Flyback Power Supply
    Last Update : 03-Mar-2011

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