Texas Instruments LM3402HV Evaluation Board LM3402HVEVAL/NOPB 사용자 매뉴얼

차례

• 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

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• ELECTRICAL CHARACTERISTICS LM3402HV

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• ELECTRICAL CHARACTERISTICS LM3402/LM3402HV

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• TYPICAL PERFORMANCE CHARACTERISTICS

  7
• BLOCK DIAGRAM

  10
• APPLICATION INFORMATION

  11
  • THEORY OF OPERATION

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  • CONTROLLED ON-TIME OVERVIEW

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  • AVERAGE LED CURRENT ACCURACY

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  • MAXIMUM OUTPUT VOLTAGE

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  • MINIMUM OUTPUT VOLTAGE

    12
  • HIGH VOLTAGE BIAS REGULATOR

    12
  • INTERNAL MOSFET AND DRIVER

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  • FAST SHUTDOWN FOR PWM DIMMING

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  • PEAK CURRENT LIMIT

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  • OVER-VOLTAGE/OVER-CURRENT COMPARATOR

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  • LOW POWER SHUTDOWN

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  • THERMAL SHUTDOWN

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• DESIGN CONSIDERATIONS

  15
  • SWITCHING FREQUENCY

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  • LED RIPPLE CURRENT

    15
  • BUCK CONVERTERS WITHOUT OUTPUT CAPACITORS

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  • BUCK CONVERTERS WITH OUTPUT CAPACITORS

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  • INPUT CAPACITORS

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  • RECIRCULATING DIODE

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  • LED CURRENT DURING DIM MODE

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  • Transient Protection Considerations

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    • CS PIN PROTECTION

      18
    • CS PIN PROTECTION WITH OVP

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    • VIN PIN PROTECTION

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    • GENERAL COMMENTS REGARDING OTHER PINS

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  • Design Example 1: LM3402

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    • USING AN OUTPUT CAPACITOR

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    • OUTPUT INDUCTOR

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    • INPUT CAPACITOR

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    • RECIRCULATING DIODE

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    • EFFICIENCY

      25
    • DIE TEMPERATURE

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  • Design Example 2: LM3402HV

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    • OUTPUT VOLTAGE

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    • USING AN OUTPUT CAPACITOR

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    • OUTPUT INDUCTOR

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    • INPUT CAPACITOR

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    • RECIRCULATING DIODE

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    • EFFICIENCY

      28
  • Layout Considerations

    29
    • COMPACT LAYOUT

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    • GROUND PLANE AND SHAPE ROUTING

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    • CURRENT SENSING

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    • REMOTE LED ARRAYS

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• Revision History

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