Manuali utente per Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB

Sommario

• FEATURES

  1
• APPLICATIONS

  1
• DESCRIPTION

  1
• TYPICAL APPLICATION CIRCUIT

  1
• CONNECTION DIAGRAM

  2
• ABSOLUTE MAXIMUM RATINGS

  3
• RECOMMENDED OPERATING CONDITIONS

  3
• ELECTRICAL CHARACTERISTICS

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• TYPICAL PERFORMANCE CHARACTERISTICS

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• BLOCK DIAGRAM

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• OPERATION DESCRIPTION

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  • BOOST CONTROLLER

    10
  • ENABLE and UVLO

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  • Soft-Start

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  • Output Voltage, OVP, and SH

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  • Switching Frequency

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  • Inductor Selection

    12
  • Current Sensing

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  • Current Limit

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  • VCC

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  • Diode Selection

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  • NFET Selection

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  • Input Capacitor Selection

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  • Output Capacitor Selection

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  • Compensation

    16
  • LED CURRENT REGULATOR

    19
    • Setting LED Current

      19
    • NDRV

      19
    • CFB and SC Diodes

      19
    • Dimming

      20
    • Setting FF

      21
  • LED Protection

    22
    • Fault Modes and Fault Delay

      22
    • Fault Shutdown and Automatic Restart

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    • Open LED

      24
    • Shorted LED

      24
    • Shorted Cathode

      25
  • Thermal Considerations

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    • THM

      25
    • TSD

      26
  • Temperature Coefficients

    27
  • LEDOFF: Adding Additional channels

    27
  • LED Current Accuracy

    27
  • PCB Layout

    28
• Revision History

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