National Semiconductor | High-performance Analog

 

 LM5026   
Active Clamp Current Mode PWM Controller from the PowerWise® Family		 Click link to Download

Features

  • Current Mode Control
  • Internal 100V Start-up Bias Regulator
  • 3A Compound Main Gate Driver
  • High Bandwidth Opto-coupler Interface
  • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
  • Versatile Dual Mode Over-Current Protection with hiccup delay timer
  • Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
  • Programmable Maximum Duty Cycle Clamp
  • Programmable Soft-start
  • Leading Edge Blanking
  • Resistor Programmed 1MHz Capable Oscillator
  • Oscillator Sync I/O Capability
  • Precision 5V Reference

    • Description

    The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp / reset technique with current mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8V to 100V. Additional features include programmable maximum duty cycle, line under-voltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1MHz capable oscillator with synchronization input / output capability, precision reference and thermal shutdown.

    Also Recommended
    LM3411Feedback Control / Optocoupler Driver For Isolated Supplies
    LM5025▲Active Clamp Voltage Mode PWM Controller
    LM5025A▲Active Clamp Voltage Mode PWM Controller
    LM5034▲Dual Interleaved Active Clamp Current Mode Controller
    LM5110Dual 5A Compound Gate Driver With Negative Drive Capability
    LM5112High Current 7A Single Low-Side Mosfet Driver



    Typical Application
    click for larger image


    		Block Diagram
    *click for larger image


    Parameters / ValuesLM5026 LM5025 LM5025A LM5034
    PWM ModeCurrent Voltage/Feed-forward Voltage/Feed-forward Current
    TopologyForward Active Clamp Forward Active Clamp Forward Active Clamp Forward Active Clamp
    Input Min Voltage8 Volt 8 Volt 8 Volt 13 Volt
    Input Max Voltage100 Volt 90 Volt 90 Volt 100 Volt
    Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz
    Efficiency (peak)92.5 % 92.5 % 92.5 % 94 %
    Adj Switch FrequencyYes Yes Yes Yes
    Frequency Min100 kHz 100 kHz 100 kHz 100 kHz
    Sync PinYes Yes Yes Yes
    Sync TypeInput, Output Up, down Up, down Up
    UVLOYes Yes Yes Yes
    On/Off PinYes Yes Yes Yes
    PowerGood / Error FlagNo No No No
    Current Limit Typecycle-cycle, hiccup cycle-cycle, hiccup cycle-cycle, hiccup cycle-cycle, hiccup
    Gate Drive3 Amp 3 Amp 3 Amp 2.5 Amp
    Output RangeUndefined NA
    Special FeaturesHigh bandwidth opto interface; programmable max. duty cycle Controls dual or single interleaved converter
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C
    Step-DownYes Yes Yes Yes
    Step-UpYes Yes Yes Yes
    FlybackYes No Yes No
    InvertingYes Yes Yes Yes
    RegTypeSwitching Controller Switching Controller Switching Controller Switching Controller
    Adjustable OutputYes Yes Yes Yes
    Output Power300 Watt 300 Watt 300 Watt 600 Watt
    Switching Frequency1000 kHz 1000 kHz 1000 kHz 2000 kHz
    Multiple Output CapabilityYes Yes Yes Yes
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM5026 Active Clamp Current Mode PWM Controller679
    Kbytes    		9-Mar-10   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1387: Application Note 1387 LM5026 Evaluation Board721
    Kbytes    		7-Sep-05 中文
    AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge230
    Kbytes    		2-Jul-08 
    AN-1574: Application Note 1574 LM5073 Evaluation Board464
    Kbytes    		24-Apr-07 


    Other Technical Documents
    TitleTypeDate
    Operation and Benefits of Active-Clamp Forward Power ConvertersPower Designer 2007-03-22
    Current Mirror Improves PWM Regulator's PerformanceExternal Article 2007-03-01

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5026MT/NOPB

    LM5026MT

    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide239
    AVNET-EMWorldwide218
    DIGI-KEYWorldwide388
    FARNELLEurope and Asia943
    NEWARKAmericas1206
    RS COMPONENTSWorldwide10
    TAYLORAmericas1362
    		$1.30 each at 1K+ pcsrail
    of
    92
    LM5026MTX/NOPB

    LM5026MTX

    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide2500
    AVNET-EMWorldwide2500
    CEACAsia Pacific75000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    RSL MICROAsia Pacific10000
    TAYLORAmericas2500
    		$1.30 each at 1K+ pcsreel
    of
    2500
    LM5026SD/NOPB

    LM5026SD

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4900
    DIGI-KEYWorldwide0
    MOUSERWorldwide960
    RS COMPONENTSWorldwide30
    TAYLORAmericas4900
    		$1.30 each at 1K+ pcsreel
    of
    1000
    LM5026SDX/NOPB

    LM5026SDX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.30 each at 1K+ pcsreel
    of
    4500

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM5026.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM5026 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5026EVAL/NOPB

    		Active Clamp Current Mode PWM ControllerFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$135.00 each1

    LM5026 Active Clamp Current Mode PWM Controller

    Features:

    • Current Mode Control
    • Internal 100V Start-up Bias Regulator
    • 3A Compound Main Gate Driver
    • High Bandwidth Opto-coupler Interface
    • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
    • Versatile Dual Mode Over-Current Protection with Hiccup Delay Timer
    • Programmable Overlap or Deadtime Between the Main and Active Clamp Outputs
    • Programmable Maximum Duty Cycle Clamp
    • Programmable Soft-start
    • Leading Edge Blanking
    • Resistor Programmed 1MHz Capable Oscillator
    • Oscillator Sync I/O Capability
    • Precision 5V Reference

    Contents:

    • A fully assembled LM5026 evaluation board.
    • LM5026 datasheet
    • LM5026 eval board appnote



    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM5026MT/NOPB

    LM5026MT
    		56.74
    57
    		TSSOP161
    1    		260
    260    		DetailDownloadspice file
    		NSUZXYTT
    LM5026
    MT
    LM5026MTX/NOPB

    LM5026MTX
    		56.74
    57
    		TSSOP161
    1    		260
    260    		DetailDownloadspice file
    		NSUZXYTT
    LM5026
    MT
    LM5026SD/NOPB

    LM5026SD
    		64.927
    65.192
    		LLP161
    1    		260
    260    		DetailDownloadspice file
    		NS
    UZXYTT
    5026SD
    LM5026SDX/NOPB

    LM5026SDX
    		64.927
    65.192
    		LLP161
    1    		260
    260    		DetailDownloadspice file
    		NS
    UZXYTT
    5026SD

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM5026.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM5026 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM5026MTABCD150XV1038680025950002736338335
    LM5026MTXABCD150XV1038680025950002736338335
    LM5026SDABCD150XV1038680025950002736338335
    LM5026SDXABCD150XV1038680025950002736338335

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM5026.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM5026 is located at RoHS Status.

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation