National Semiconductor | High-performance Analog

 

 LM5115A   
Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down Tracking 		Click link to Download

Features
  • Power-up/Power-down Tracking
  • Self-synchronization to main channel output
  • Leading edge pulse width modulation
  • Valley current Mode control
  • Standalone DC/DC synchronous buck mode
  • Operates from AC or DC input up to 75V
  • Wide 4.5V to 30V bias supply range
  • Wide 0.75V to 13.5V output range.
  • Top and bottom gate drivers sink 2.5A peak
  • Adaptive gate driver dead-time control
  • Wide bandwidth error amplifier (4MHz)
  • Programmable soft-start
  • Thermal shutdown protection
  • TSSOP-16 package

    • Description

    The LM5115A controller contains all of the features necessary to produce multiple tracking outputs using the Secondary Side Post Regulation (SSPR) technique. The SSPR technique develops a highly efficient and well regulated auxiliary output from the secondary side switching waveform of an isolated power converter. LM5115A can be also used as a standalone DC/DC synchronous buck controller ( Refer to Synchronous Buck section). Regulation of the auxiliary output voltage is achieved by leading edge pulse width modulation (PWM) of the main channel duty cycle. Leading edge modulation is compatible with either current mode or voltage mode control of the main output. The LM5115A drives external high-side and low-side NMOS power switches configured as a synchronous buck regulator. A current sense amplifier provides overload protection and operates over a wide common mode input range. Additional features include a low dropout (LDO) bias regulator, error amplifier, precision reference, adaptive dead time control of the gate signals and thermal shutdown.

    Also Recommended
    LM25115▲42V Maximum Input With No Tracking
    LM25115A▲42V Maximum Input
    LM5025▲Active Clamp Voltage Mode PWM Controller
    LM5025A▲Active Clamp Voltage Mode PWM Controller
    LM5115▲No Tracking



    Typical Application
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    		Block Diagram
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    Typical Performance
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    Parameters / ValuesLM5115A LM25115 LM25115A LM5025 LM5025A LM5115
    PWM ModeValley current mode Voltage/current-injection Valley current mode Voltage/Feed-forward Voltage/Feed-forward Voltage/current-injection
    TopologySynchronous secondary-side post-regulator Synchronous secondary-side post-regulator Synchronous secondary-side post-regulator Forward Active Clamp Forward Active Clamp Synchronous secondary-side post-regulator
    Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 8 Volt 8 Volt 4.5 Volt
    Input Max Voltage75 Volt 42 Volt 42 Volt 90 Volt 90 Volt 75 Volt
    Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz
    Efficiency (peak)90 % 90 % 90 % 92.5 % 92.5 % 90 %
    Adj Switch FrequencyYes Yes Yes Yes Yes Yes
    Frequency Min50 kHz 50 kHz 50 kHz 100 kHz 100 kHz 50 kHz
    Sync PinNo Yes Yes Yes Yes Yes
    Sync TypeUp Up Up Up, down Up, down Up
    UVLONo No No Yes Yes No
    On/Off PinYes Yes Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No No
    Current Limit Typecycle-cycle cycle-cycle cycle-cycle cycle-cycle, hiccup cycle-cycle, hiccup cycle-cycle
    Gate Drive2.5 Amp 2.5 Amp 2.5 Amp 3 Amp 3 Amp 2.5 Amp
    Output Current20000 mA 20000 mA 20000 mA 20000 mA
    Feedback Voltage0.75 Volt 0.75 Volt 0.75 Volt 0.75 Volt
    Feedback Tolerance1.7 % 1.7 % 1.7 % 1.7 %
    Output Range0.75V to 13.5V 0.75V to 13.5V 0.75V to 13.5V 0.75V to 13.5V
    Special FeaturesTracking; Operates from AC or DC input Operates from AC or DC input Tracking; Operates from AC or DC input Operates from AC or DC input
    Temperature Min-40 deg C -40 deg C -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 125 deg C 125 deg C
    Step-DownYes Yes Yes Yes Yes Yes
    Step-UpNo No No Yes Yes No
    FlybackNo No No No Yes No
    InvertingNo No No Yes Yes No
    RegTypeSwitching Controller Switching Controller Switching Controller Switching Controller Switching Controller Switching Controller
    Adjustable OutputYes Yes Yes Yes Yes Yes
    Output Power300 Watt 300 Watt 300 Watt 300 Watt 300 Watt 300 Watt
    Switching Frequency1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz
    Multiple Output CapabilityNo No No Yes Yes No
    AutomotiveYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down Tracking406
    Kbytes    		11-Jan-07   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1628: Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter91
    Kbytes    		5-Sep-07日本語
    中文


    Other Technical Documents
    TitleTypeDate
    Hitchhiker's Ride to the World of Current Mode ControlExternal Article 2007-07-11

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5115AMT/NOPB

    LM5115AMT

    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide136
    DIGI-KEYWorldwide116
    MOUSERWorldwide276
    TAYLORAmericas136
    		$1.85 each at 1K+ pcsrail
    of
    92
    LM5115AMTX/NOPB

    LM5115AMTX

    RoHS Status

    TSSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    CEACAsia Pacific2500
    DIGI-KEYWorldwide0
    		$1.85 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 LM5115A.

    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 LM5115A is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5115AEVAL
    		Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down TrackingFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$51.80 each1

    LM5115A Secondary Side Post Regulator / DC-DC Converter with Power-up / Power-down Tracking

    Features:

    • Power-up / Power-down Tracking
    • Self-synchronization to main channel output
    • Leading edge pulse width modulation
    • Valley current Mode control
    • Standalone DC-DC synchronous buck mode
    • Operates from AC or DC input up to 75V
    • Wide 4.5V to 30V bias supply range
    • Wide 0.75V to 13.5V output range
    • Top and bottom gate drivers sink 2.5A peak
    • Adaptive gate driver dead-time control
    • Wide bandwidth error amplifier (4MHz)
    • Programmable soft-start
    • Thermal shutdown protection
    • TSSOP-16 package

    Contents:

    • A fully assembled LM5115A evaluation board
    • LM5115A datasheet
    • LM5115A evaluation 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
    LM5115AMT/NOPB

    LM5115AMT
    		56.74
    57
    		TSSOP161
    1    		260
    260    		DetailN/AN/A
    		NSUZXYTT
    LM5115
    AMT
    LM5115AMTX/NOPB

    LM5115AMTX
    		56.74
    57
    		TSSOP161
    1    		260
    260    		DetailN/AN/A
    		NSUZXYTT
    LM5115
    AMT

    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 LM5115A.

    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 LM5115A is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - Hitchhiker's Ride to the World of Current Mode Control  

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM5115AMTABCD150XV1038680025950002736338335
    LM5115AMTXABCD150XV1038680025950002736338335

    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 LM5115A.

    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 LM5115A is located at RoHS Status.

    [Information as of 8-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation