National Semiconductor | High-performance Analog

 

 LM25037   
Dual-Mode PWM Controller With Alternating Outputs from the PowerWise® Family		 Click link to Download

Features

  • LM25037Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to 125°C operating junction temperature)
  • Ultra wide input operating range from 5.5V to 75V
  • Alternating outputs for double-ended topologies
  • Current-mode or feed-forward voltage-mode control
  • Programmable maximum duty cycle limit
  • 2.0% feedback reference accuracy
  • High gain-bandwidth error amplifier
  • Programmable line under-voltage lockout (UVLO) with adjustable hysteresis
  • Versatile dual mode over-current protection with hiccup delay timer
  • Programmable soft-start
  • Precision 5V reference output
  • Current sense leading edge blanking
  • Resistor programmed 2 MHz capable oscillator
  • Oscillator synchronization capability with low frequency lockout protection

    • Description

    The LM25037 PWM controller contains all the features necessary to implement balanced double-ended power converter topologies, such as push-pull, half-bridge and full-bridge. These double-ended topologies allow for higher efficiencies and greater power densities compared to common single-ended topologies such as the flyback and forward. The LM25037 can be configured for either voltage mode or current mode control with minimum external components. Two alternating gate drive outputs are provided, each capable of 1.2A peak output current. The LM25037 can be configured to operate directly from the input voltage rail over an ultra-wide range of 5.5V to 75V. Additional features include programmable maximum duty cycle limit, line under-voltage lockout, cycle-by-cycle current limit and a hiccup mode fault protection with adjustable timeout delay, soft-start and a 2 MHz capable oscillator with synchronization capability, precision reference and thermal shutdown.

    Also Recommended
    LM5030▲100V Push-Pull Current Mode PWM Controller
    LM5035▲PWM Controller With Integrated Half-Bridge And SyncFET Drivers
    LM5037▲High Voltage Version 13V To 100V Input
    LM5102100V High Voltage Half-Bridge Gate Driver



    Typical Application
    *click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM25037 LM5030 LM5035 LM5037
    PWM ModeFeed Forward Voltage/Current Mode Current Voltage Feed-Forward Voltage Mode/Current Mode
    TopologyPush-Pull,Half-Bridge and Full-Bridge Push-Pull, Full-bridge, Half-bridge Half-bridge Push-Pull,Half-Bridge and Full-Bridge
    Input Min Voltage5.5 Volt 14 Volt 8 Volt 13 Volt
    Input Max Voltage75 Volt 90 Volt 105 Volt 100 Volt
    Frequency Max2000 kHz 1000 kHz 1000 kHz 2000 kHz
    Efficiency (peak)88 % 95 % 92 % 88 %
    Adj Switch FrequencyYes Yes Yes Yes
    Frequency Min50 kHz 50 kHz 50 kHz 50 kHz
    Sync PinYes Yes Yes Yes
    Sync TypeUp Up Up Up
    UVLOYes No Yes Yes
    On/Off PinNo Yes No No
    PowerGood / Error FlagNo No No No
    Current Limit TypeCycle-Cycle and Hiccup cycle-cycle, hiccup cycle-cycle, hiccup Cycle-Cycle and Hiccup-Mode Restart
    Gate Drive1.2 Amp 1.5 Amp 2 Amp 1.2 Amp
    Feedback Voltage1.25 Volt 1.25 Volt 1.25 Volt
    Feedback Tolerance2 % 2 % 2 %
    Special FeaturesDual-Mode control,Maximum Duty Cycle Limit, 5V Reference, Soft-Start Slope compensation, direct opto-coupler interface SyncFET driver, high bandwidth opto interface, thermal sensor/OVP comparator Soft-start, 5V Reference, UVLO with adjustable hysteresis
    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
    FlybackNo No Yes No
    InvertingNo Yes Yes Yes
    RegTypeSwitching Controller Switching Controller Switching Controller Switching Controller
    Adjustable OutputYes Yes Yes Yes
    Output Power50 Watt 100 Watt
    Switching Frequency250 kHz 1000 kHz 1000 kHz
    Multiple Output CapabilityNo Yes Yes Yes
    AEC Q-100 Automotive Grade1
    AutomotiveNo Yes
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM25037 Dual-Mode PWM Controller With Alternating Outputs486
    Kbytes    		8-Jan-10   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1861: Application Note 1861 LM25037 Evaluation Board1088
    Kbytes    		18-Dec-08 


    Other Technical Documents
    TitleTypeDate
    Voltage-Mode Push-Pull Converters Deserve a Second LookExternal Article 2009-04-01
    An Alternative Approach to Higher-Power Boost ConvertersPower Designer 2009-11-30

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25037MT/NOPB


    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide242
    AVNET-EMWorldwide214
    DIGI-KEYWorldwide129
    FARNELLEurope and Asia319
    MOUSERWorldwide181
    NEWARKAmericas210
    TAYLORAmericas242
    		$1.35 each at 1K+ pcsrail
    of
    92
    LM25037MTX/NOPB


    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    CEACAsia Pacific5000
    DIGI-KEYWorldwide0
    		$1.35 each at 1K+ pcsreel
    of
    2500
    LM25037QMT/NOPB

    Auto Grade 1
    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide261
    DIGI-KEYWorldwide173
    MOUSERWorldwide276
    		$1.62 each at 1K+ pcsrail
    of
    92
    LM25037QMTX/NOPB

    Auto Grade 1
    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.62 each at 1K+ pcsreel
    of
    2500

    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 LM25037.

    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 LM25037 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25037EVAL
    		Evaluation Boards for LM25037 - Dual PWM Controller with Alternating OutputsFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia2
    NEWARKAmericas2
    		$105.00 each1

    Description:

    The LM25037 evaluation board is designed to provide the design engineer with a fully functional power converter based on push-pull topology to evaluate the LM25037 controller.

    Features:

    • Input Operating Range: 16 to 32V
    • Output Voltage: 5.0V
    • Output Current: 0 to 10A
    • Measured Efficiency: 88% @ 10A Load and 24V Input
    • Frequency of Operation: 250 kHz
    • Board Size: 3.5x2.25x0.05 inches (4 layers of 2 oz copper)
    • Load Regulation: 2%
    • Line UVLO (14V rising / 11V falling)

    Contents:




    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
    LM25037MT/NOPB

    		56.74
    		TSSOP161260DetailDownloadN/A
    		NSUZXYTT
    L25037
    MT
    LM25037MTX/NOPB

    		56.74
    		TSSOP161260DetailDownloadN/A
    		NSUZXYTT
    L25037
    MT
    LM25037QMT/NOPB

    		56.74
    		TSSOP161260DetailDownloadN/A
    		NSUZXYTT
    M25037
    MT
    LM25037QMTX/NOPB

    		56.74
    		TSSOP161260DetailDownloadN/A
    		NSUZXYTT
    M25037
    MT

    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 LM25037.

    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 LM25037 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM25037MTABCD150XV1038680025950002736338335
    LM25037MTXABCD150XV1038680025950002736338335
    LM25037QMTABCD150XV1038680025950002736338335
    LM25037QMTXABCD150XV1038680025950002736338335

    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 LM25037.

    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 LM25037 is located at RoHS Status.

    What's New in Power -- January 2009
    Loading video...


    What's New in Power -- January 2009
    Date: 2009-01-19
    Length: 0:04:57
    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation