SNVU737A December   2020  – December 2021 LM5123-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Applications
    2. 1.2 Features
  3. 2EVM Setup
    1. 2.1 EVM Characteristics
    2. 2.2 EVM Connectors and Test Points
    3. 2.3 EVM Configurations
      1. 2.3.1 Output Voltage Tracking
  4. 3Test Setup and Procedures
    1. 3.1 Equipment
  5. 4Test Results
    1. 4.1 Efficiency
    2. 4.2 Load Regulation
    3. 4.3 Thermal Performance
    4. 4.4 Start-up Waveforms
    5. 4.5 Steady State Operation
    6. 4.6 Load Transient Response
    7. 4.7 Output Voltage Tracking
  6. 5PCB Layers
  7. 6Schematic
  8. 7Bill of Materials
  9. 8Revision History

1.2 Features

The LM5123EVM-BST has the following features:

  • Input voltage range from 8-V to 18-V
  • Internal low leakage current high-impedance feedback resistors with programmable output voltage
  • Operating frequency of 440 kHz with externally clock synchronization up or down by 20%
  • Output voltage tracking using the TRK pin of the LM5123-Q1
  • Bypass mode operation when VIN is greater than VOUT
  • Selectable forced-PWM (FPWM), Skip mode, or diode emulation using the MODE pin
  • High power conversion efficiency across a wide operating range
    • Full-load efficiency of greater then 97% at VIN = 14-V, VOUT = 24-V, POUT = 200-W
  • Cycle-by-cycle peak current limiting
  • Optional frequency dithering for improved EMI performance
  • Power good indicator
  • Programmable soft-start time
  • Programmable line undervoltage lockout (UVLO)