Analog Devices ADP1882 Evaluation Board ADP1882-1.0-EVALZ User Manuals

Table of Contents

• FEATURES

  1
• APPLICATIONS

  1
• TYPICAL APPLICATIONS CIRCUIT

  1
  • GENERAL DESCRIPTION

    1
• TABLE OF CONTENTS

  2
• 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
• ADP1882/ADP1883 BLOCK DIAGRAM

  18
• THEORY OF OPERATION

  19
  • STARTUP

    19
  • SOFT START

    19
  • PRECISION ENABLE CIRCUITRY

    19
  • UNDERVOLTAGE LOCKOUT

    19
  • THERMAL SHUTDOWN

    19
  • PROGRAMMING RESISTOR (RES) DETECT CIRCUIT

    20
  • VALLEY CURRENT-LIMIT SETTING

    20
  • HICCUP MODE DURING SHORT CIRCUIT

    21
  • SYNCHRONOUS RECTIFIER

    22
  • POWER SAVING MODE (PSM) VERSION (ADP1883)

    22
  • TIMER OPERATION

    22
  • PSEUDO-FIXED FREQUENCY

    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 CONSIDERATIONS

    26
    • Channel Conduction Loss

      26
    • MOSFET Driver Loss

      26
    • Switching Loss

      26
    • Diode Conduction Loss

      27
    • Inductor Loss

      27
  • INPUT CAPACITOR SELECTION

    27
  • THERMAL CONSIDERATIONS

    28
  • DESIGN EXAMPLE

    28
    • Input Capacitor

      28
    • Inductor

      29
    • Current Limit Programming

      29
    • Output Capacitor

      29
    • Feedback Resistor Network Setup

      29
    • Compensation Network

      29
    • Loss Calculations

      30
• EXTERNAL COMPONENT RECOMMENDATIONS

  31
• LAYOUT CONSIDERATIONS

  33
  • IC SECTION (LEFT SIDE OF EVALUATION BOARD)

    36
  • POWER SECTION

    36
  • DIFFERENTIAL SENSING

    36
• TYPICAL APPLICATIONS CIRCUITS

  37
  • DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATIONS CIRCUIT

    37
  • SINGLE-INPUT, 600 kHz APPLICATIONS CIRCUIT

    37
  • DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATIONS CIRCUIT

    38
• OUTLINE DIMENSIONS

  39
  • ORDERING GUIDE

    39