Analog Devices ADP1875 Evaluation Board ADP1875-0.6-EVALZ マニュアル

目次

• Features

  1
• Applications

  1
• General Description

  1
• Typical Applications Circuit

  1
• Table of Contents

  2
  • Revision History

    2
• Specifications

  3
• Absolute Maximum Ratings

  6
  • Thermal Resistance

    6
  • Boundary Condition

    6
  • ESD Caution

    6
• Pin Configuration and Function Descriptions

  7
• Typical Performance Characteristics

  8
• ADP1874/ADP1875 Block Digram

  18
• Theory of Operation

  19
  • Startup

    19
  • Soft Start

    19
  • Precision Enable Circuitry

    19
  • Undervoltage Lockout

    19
  • On-Board Low Dropout Regulator

    20
  • Thermal Shutdown

    20
  • Programming Resistor (RES) Detect Circuit

    20
  • Valley Current-Limit Setting

    20
  • Hiccup Mode During Short Circuit

    22
  • Synchronous Rectifier

    22
  • ADP1875 Power Saving Mode (PSM)

    22
  • Timer Operation

    23
  • Pseudo-Fixed Frequency

    24
  • Power Good Monitoring

    24
  • Voltage Tracking

    25
• Applications Information

  27
  • Feedback Resistor Divider

    27
  • Inductor Selection

    27
  • Output Ripple Voltage (ΔVRR)

    27
  • Output Capacitor Selection

    27
  • Compensation Network

    28
    • Output Filter Impedance (ZFILT)

      28
    • Error Amplifier Output Impedance (ZCOMP)

      28
    • Error Amplifier Gain (Gm)

      28
    • Current-Sense Loop Gain (GCS)

      28
    • Crossover Frequency

      28
  • Efficiency Consideration

    29
    • Channel Conduction Loss

      29
    • MOSFET Driver Loss

      29
    • Switching Loss

      29
    • Diode Conduction Loss

      30
    • Inductor Loss

      30
  • Input Capacitor Selection

    30
  • Thermal Considerations

    31
  • Design Example

    32
    • Input Capacitor

      32
    • Inductor

      32
    • Current Limit Programming

      32
    • Output Capacitor

      32
    • Feedback Resistor Network Setup

      33
    • Compensation Network

      33
    • Loss Calculations

      33
• External Component Recommendations

  34
• Layout Considerations

  36
  • IC Section (Left Side of Evaluation Board)

    38
  • Power Section

    38
  • Differential Sensing

    39
• Typical Application Circuits

  40
  • 12 A, 300 kHz High Current Application Circuit

    40
  • 5.5 V Input, 600 kHz Application Circuit

    40
  • 300 kHz High Current Application Circuit

    41
• Outline Dimensions

  42
  • Ordering Guide

    42