Benutzerhandbuch für Texas Instruments LM3402HV Evaluation Board LM3402HVEVAL/NOPB

Inhaltsverzeichnis

• FEATURES

  1
• APPLICATIONS

  1
• DESCRIPTION

  1
  • Typical Application

    1
  • Connection Diagram

    2
• ABSOLUTE MAXIMUM RATINGS(LM3402)

  3
• OPERATING RATINGS(LM3402)

  3
• ABSOLUTE MAXIMUM RATINGS(LM3402HV)

  4
• OPERATING RATINGS(LM3402HV)

  4
• ELECTRICAL CHARACTERISTICS LM3402

  5
• ELECTRICAL CHARACTERISTICS LM3402HV

  5
• ELECTRICAL CHARACTERISTICS LM3402/LM3402HV

  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

      18
    • CS PIN PROTECTION WITH OVP

      20
    • VIN PIN PROTECTION

      21
    • GENERAL COMMENTS REGARDING OTHER PINS

      22
  • Design Example 1: LM3402

    22
    • USING AN OUTPUT CAPACITOR

      23
    • OUTPUT INDUCTOR

      23
    • INPUT CAPACITOR

      25
    • RECIRCULATING DIODE

      25
    • EFFICIENCY

      25
    • DIE TEMPERATURE

      26
  • Design Example 2: LM3402HV

    26
    • OUTPUT VOLTAGE

      26
    • USING AN OUTPUT CAPACITOR

      26
    • OUTPUT INDUCTOR

      27
    • INPUT CAPACITOR

      27
    • RECIRCULATING DIODE

      28
    • EFFICIENCY

      28
  • Layout Considerations

    29
    • COMPACT LAYOUT

      29
    • GROUND PLANE AND SHAPE ROUTING

      29
    • CURRENT SENSING

      29
    • REMOTE LED ARRAYS

      29
• Revision History

  31