Benutzerhandbuch für Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB

Inhaltsverzeichnis

• FEATURES

  1
• APPLICATIONS

  1
• DESCRIPTION

  1
• TYPICAL APPLICATION CIRCUIT

  1
• CONNECTION DIAGRAM

  2
• ABSOLUTE MAXIMUM RATINGS

  3
• RECOMMENDED OPERATING CONDITIONS

  3
• ELECTRICAL CHARACTERISTICS

  4
• TYPICAL PERFORMANCE CHARACTERISTICS

  6
• BLOCK DIAGRAM

  8
• OPERATION DESCRIPTION

  10
  • BOOST CONTROLLER

    10
  • ENABLE and UVLO

    10
  • Soft-Start

    11
  • Output Voltage, OVP, and SH

    11
  • Switching Frequency

    12
  • Inductor Selection

    12
  • Current Sensing

    14
  • Current Limit

    14
  • VCC

    15
  • Diode Selection

    15
  • NFET Selection

    15
  • Input Capacitor Selection

    16
  • Output Capacitor Selection

    16
  • 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

      23
    • Open LED

      24
    • Shorted LED

      24
    • Shorted Cathode

      25
  • Thermal Considerations

    25
    • THM

      25
    • TSD

      26
  • Temperature Coefficients

    27
  • LEDOFF: Adding Additional channels

    27
  • LED Current Accuracy

    27
  • PCB Layout

    28
• Revision History

  30