National Semiconductor | High-performance Analog

 

 LM3423   
N-Channel Controllers for Constant Current LED Drivers from the PowerWise® Family		 Click link to Download

Features

  • LM3421Q1/LM3423Q1 are Automotive Grade products that are AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature) and similarly LM3421Q0/LM3423Q0 are AEC-Q100 grade 0 qualified (-40°C to +150°C operating junction temperature)
  • VIN range from 4.5V to 75V
  • High-side adjustable current sense
  • 2Ω, 1A Peak MosFET gate driver
  • Input under-voltage and output over-voltage protection
  • PWM and analog dimming
  • Cycle-by-cycle current limit
  • Programmable switching frequency
  • "Zero current" shutdown and thermal shutdown
  • LED output status flag (LM3423/23Q1/23Q0 only)
  • Fault status flag and timer (LM3423/23Q1/23Q0 only)

    • Description

    The LM3421/23 are versatile high voltage N-channel MosFET controllers for LED drivers . They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3421/23 ideal for illuminating LEDs in a large family of applications.

    Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421/23 uses Predictive Off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

    The LM3421/23 devices include a high-voltage startup regulator that operates over a wide input range of 4.5V to 75V. The internal PWM controller is designed for adjustable switching frequencies of up to 2.0 MHz, thus enabling compact solutions. Additional features include "zero current" shutdown, analog dimming, PWM dimming, over-voltage protection, under-voltage lock-out, cycle-by-cycle current limit, and thermal shutdown.

    The LM3423 also includes an LED output status flag, a fault flag, a programmable fault timer, and a logic input to select the polarity of the dimming output driver.

    The LM3421Q1/23Q1 are AEC-Q100 grade 1 qualified and LM3421Q0/23Q0 are AEC-Q100 grade 0 qualified.


    Applications

  • LED Drivers - Buck, Boost, Buck-Boost, and SEPIC
  • Indoor and Outdoor Area SSL
  • Automotive
  • General Illumination
  • Constant-Current Regulators

    • WEBENCH® LM3423
     
    4.50 <=

    V in Lower
     V    		  
    <=

    V in Upper
     V    		  
    <= 75.00
    Ambient Temperature  °C <= 100
    Light Output (optional)  lumen



    What are WEBENCH® tools?



    Typical Application

     

    ParametersValues
    Topology Boost, Sepic, Buck-Boost
    Input Min Voltage 4.5 Volt
    Input Max Voltage 75 Volt
    Output Range VIN to 75V
    Output Current Undefined mA
    Efficiency (peak) 95 %
    Output Min 3 Volt
    Output Max 72 Volt
    Special Features Controller
    Adjustable Output Yes
    Dimming Method PWM, Analog
    Power Factor Correction None
    On/Off Pin Yes
    PowerGood / Error Flag Yes
    Output Voltage Undefined Volt
    Output Power Undefined Watt
    Switching Frequency Undefined kHz
    Adj Switch Frequency Yes
    Sync Pin No
    Step-Down Yes
    Step-Up Yes
    Inverting Yes
    Flyback Yes
    RegType Switching Controller
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Feedback Voltage Undefined Volt
    AEC Q-100 Automotive Grade 0
    Automotive Yes
    PowerWise Yes

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3423MH/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide438
    AVNET-EMWorldwide198
    DIGI-KEYWorldwide438
    FARNELLEurope and Asia482
    KEIKONGAsia Pacific1022
    MOUSERWorldwide139
    NEWARKAmericas32
    TAYLORAmericas438
    		$1.75 each at 1K+ pcsrail
    of
    73
    LM3423MHX/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    RSL MICROAsia Pacific15000
    		$1.75 each at 1K+ pcsreel
    of
    2500
    LM3423Q0MH/NOPB

    Auto Grade 0
    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide125
    FARNELLEurope and Asia203
    MOUSERWorldwide89
    NEWARKAmericas203
    		$2.10 each at 1K+ pcsrail
    of
    73
    LM3423Q0MHX/NOPB

    Auto Grade 0
    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$2.10 each at 1K+ pcsreel
    of
    2500
    LM3423Q1MH/NOPB

    Auto Grade 1
    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide130
    FARNELLEurope and Asia219
    MOUSERWorldwide219
    NEWARKAmericas219
    		$1.95 each at 1K+ pcsrail
    of
    73
    LM3423Q1MHX/NOPB

    Auto Grade 1
    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.95 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 LM3423.

    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 LM3423 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3423BBLSCSEV/NOPB

    		LM3423 Buck-Boost 2-Layer Low Side Current Sense Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide3
    MOUSERWorldwide1
    		$110.00 each1

    General Description:

    This wide range evaluation board showcases the LM3423 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700 mA from a DC input voltage of 10 to 70V.

    The evaluation board showcases most features of the LM3423 including PWM dimming, fault and LED status flags, output overvoltage protection and input under-voltage lockout. It also has a connector footprint (J7) which can mate with an external LED load board allowing for the LEDs to be mounted close to the driver.  Alternatively, the LED+ and LED- banana jacks can be used to connect the LED load.

    The buck-boost circuit can be easily redesigned for different specifications by changing only a few components (see the Alternate Designs section found at the end of this application note). This board can also be used to evaluate the features and topology of the LM3421 as the LM3423 is a superset of the features and functionality of the LM3421 IC.

    Contents:

    • LM3423 Buck-Boost 2-Layer Low Side Current Sense Evaluation Board
    • AN-2010 Application Note LM3423 Buck-Boost 2-layer Evaluation Board

    not included: LM3423 Datasheet


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3423BS2LYEV/NOPB

    		LM3423 LED Boost 2 Layer Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    AVNET-EMWorldwide2
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$110.00 each1

    This evaluation board showcases the LM3423 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 700mA from a DC input voltage of 10 to 26V. The evaluation board showcases most features of the LM3423 including PWM dimming, overvoltage protection and input under-voltage lockout. It also has a connector footprint (J7) which can mate with an external LED load board allowing for the LEDs to be mounted close to the driver. Alternatively, the LED+ and LED- banana jacks can be used to connect the LED load.

    Contents:

    • LM3423BS3LYEV assembled board
    • AN-2011 LM3423 Boost 2 Layer Evaluation Board Application Note



    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
    LM3423MH/NOPB

    		73.061
    73.591
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    MH
    LM3423MHX/NOPB

    		73.061
    73.591
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    MH
    LM3423Q0MH/NOPB

    		73.061
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    Q0MH
    LM3423Q0MHX/NOPB

    		73.061
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    Q0MH
    LM3423Q1MH/NOPB

    		73.061
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    Q1MH
    LM3423Q1MHX/NOPB

    		73.061
    		TSSOP EXP PAD201260DetailDownloadN/A
    		NSUZXYTT
    LM3423
    Q1MH

    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 LM3423.

    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 LM3423 is located at RoHS Status.


    Reference Design
    RD-168 - Ambient Light Adaptive LED Driver

    CAD Symbols and Models
    Download LM3423 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3423MHABCD150XV1038680025950002736338335
    LM3423MHXABCD150XV1038680025950002736338335
    LM3423Q0MHABCD150XV1038680025950002736338335
    LM3423Q0MHXABCD150XV1038680025950002736338335
    LM3423Q1MHABCD150XV1038680025950002736338335
    LM3423Q1MHXABCD150XV1038680025950002736338335

    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 LM3423.

    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 LM3423 is located at RoHS Status.

    What's New in Power Management -- February 2010
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    WEBENCH® LED Architect Software Guided Tour
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    National's LED Drivers Deliver High Performance at Low Power
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    LED Driver Design for General Illumination
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    Automotive LED Lighting Challenges & Solutions
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    LED Bulb Replacement Using National LED Drivers & Nuventix SynJet® Coolers
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    Infrared (IR) OLIROS LED Lighting Module
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    Driving High Power LEDs without Getting Burned - Part 1
    Loading video...


    Driving High Power LEDs without Getting Burned - Part 2
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    What's New in Power Management -- February 2010
    Date: 2010-02-15
    Length: 0:6:02
    WEBENCH® LED Architect Software Guided Tour
    Date: 2010-09-08
    Length: 0:05:36
    National's LED Drivers Deliver High Performance at Low Power
    Date: 2009-01-12
    Length: 0:04:55

    LED Driver Design for General Illumination
    Date: 2009-05-04
    Length: 0:36:55
    Automotive LED Lighting Challenges & Solutions
    Date: 2009-04-14
    Length: 0:35:00
    LED Bulb Replacement Using National LED Drivers & Nuventix SynJet® Coolers
    Date: 2009-06-18
    Length: 0:18:34
    Infrared (IR) OLIROS LED Lighting Module
    Date: 2009-07-06
    Length: 0:13:49
    Driving High Power LEDs without Getting Burned - Part 1
    Date: 2007-10-30
    Length: 00:57:03
    Driving High Power LEDs without Getting Burned - Part 2
    Date: 2008-01-08
    Length: 00:43:29
    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation