Manuali utente per Analog Devices ADP1879 Evaluation Board ADP1879-1.0-EVALZ

Sommario

• Features

  1
• Applications

  1
• Typical Applications Circuit

  1
• General Description

  1
• Revision History

  2
• Specifications

  3
  • Absolute Maximum Ratings

    5
  • Thermal Resistance

    5
    • Boundary Condition

      5
  • ESD Caution

    5
• Pin Configuration and Function Descriptions

  6
• Typical Performance Characteristics

  7
• Theory of Operation

  17
  • Block Diagram

    17
  • Startup

    18
  • Soft Start

    18
  • Precision Enable Circuitry

    18
  • Undervoltage Lockout

    18
  • On-Board Low Dropout (LDO) Regulator

    18
  • Thermal Shutdown

    19
  • Programming Resistor (RES) Detect Circuit

    19
  • Valley Current-Limit Setting

    19
  • Hiccup Mode During Short Circuit

    21
  • Synchronous Rectifier

    21
  • ADP1879 Power Saving Mode (PSM)

    21
  • Timer Operation

    22
  • Pseudo Fixed Frequency

    22
  • Power-Good Monitoring

    23
• Applications Information

  24
  • Feedback Resistor Divider

    24
  • Inductor Selection

    24
  • Output Ripple Voltage (ΔVRR)

    24
  • Output Capacitor Selection

    24
  • Compensation Network

    25
    • Output Filter Impedance (ZFILT)

      25
    • Error Amplifier Output Impedance (ZCOMP)

      25
    • Error Amplifier Gain (Gm)

      25
    • Current-Sense Loop Gain (GCS)

      25
    • Crossover Frequency

      25
  • Efficiency Consideration

    26
    • Channel Conduction Loss

      26
    • MOSFET Driver Loss

      26
    • MOSFET Switching Loss

      26
    • Body Diode Conduction Loss

      26
    • Inductor Loss

      27
  • Input Capacitor Selection

    27
  • Thermal Considerations

    27
  • Design Example

    29
    • Input Capacitor

      29
    • Inductor

      29
    • Current-Limit Programming

      29
    • Output Capacitor

      29
    • Feedback Resistor Network Setup

      30
    • Compensation Network

      30
    • Loss Calculations

      30
• External Component Recommendations

  31
• Layout Considerations

  33
  • IC Section (Left Side of Evaluation Board)

    35
  • Power Section

    35
  • Differential Sensing

    36
• Typical Application Circuits

  37
  • 12 A, 300 kHz High Current Application Circuit

    37
  • 5.5 V Input, 600 kHz Current Application Circuit

    37
  • 300 kHz High Current Application Circuit

    38
• Packaging and Ordering Information

  39
  • Outline Dimensions

    39
  • Ordering Guide

    40