Benutzerhandbuch für Texas Instruments LM3404 Evaluation Boards LM3404HVEVAL/NOPB

Inhaltsverzeichnis

• FEATURES

  1
• APPLICATIONS

  1
• DESCRIPTION

  1
  • Typical Application

    1
  • Connection Diagrams

    2
• ABSOLUTE MAXIMUM RATINGS(LM3404)

  3
• RECOMMENDED OPERATING CONDITIONS (LM3404)

  3
• ABSOLUTE MAXIMUM RATINGS (LM3404HV)

  4
• RECOMMENDED OPERATING CONDITIONS (LM3404HV)

  4
• ELECTRICAL CHARACTERISTICS

  5
• LM3404

  5
• LM3404HV

  5
• LM3404/LM3404HV

  5
• TYPICAL PERFORMANCE CHARACTERISTICS

  7
• BLOCK DIAGRAM

  10
• APPLICATION INFORMATION

  11
  • THEORY OF OPERATION

    11
  • CONTROLLED ON-TIME OVERVIEW

    11
  • AVERAGE LED CURRENT ACCURACY

    12
  • MAXIMUM OUTPUT VOLTAGE

    12
  • MINIMUM OUTPUT VOLTAGE

    12
  • HIGH VOLTAGE BIAS REGULATOR

    12
  • INTERNAL MOSFET AND DRIVER

    13
  • FAST SHUTDOWN FOR PWM DIMMING

    13
  • PEAK CURRENT LIMIT

    13
  • OVER-VOLTAGE/OVER-CURRENT COMPARATOR

    13
  • LOW POWER SHUTDOWN

    14
  • THERMAL SHUTDOWN

    14
• DESIGN CONSIDERATIONS

  15
  • SWITCHING FREQUENCY

    15
  • LED RIPPLE CURRENT

    15
  • BUCK CONVERTERS WITHOUT OUTPUT CAPACITORS

    15
  • BUCK CONVERTERS WITH OUTPUT CAPACITORS

    15
  • INPUT CAPACITORS

    16
  • RECIRCULATING DIODE

    17
  • LED CURRENT DURING DIM MODE

    17
  • TRANSIENT PROTECTION CONSIDERATIONS

    18
    • CS PIN PROTECTION

      19
    • CS PIN PROTECTION WITH OVP

      20
    • VIN PIN PROTECTION

      22
    • GENERAL COMMENTS REGARDING OTHER PINS

      23
  • Design Example 1: LM3404

    23
    • RON and tON

      24
    • OUTPUT INDUCTOR

      24
    • USING AN OUTPUT CAPACITOR

      25
    • RSNS

      25
    • INPUT CAPACITOR

      25
    • RECIRCULATING DIODE

      26
    • CB AND CF

      26
    • EFFICIENCY

      26
  • Design Example 2: LM3404HV

    27
    • RON and tON

      27
    • OUTPUT INDUCTOR

      27
    • USING AN OUTPUT CAPACITOR

      28
    • RSNS

      29
    • INPUT CAPACITOR

      29
    • RECIRCULATING DIODE

      29
    • CB AND CF

      29
    • EFFICIENCY

      29
  • Layout Considerations

    30
    • COMPACT LAYOUT

      30
    • GROUND PLANE AND SHAPE ROUTING

      30
    • CURRENT SENSING

      31
    • REMOTE LED ARRAYS

      31
• Revision History

  32