SNVU770 June   2021 LM5157 , LM5157-Q1 , LM51571-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Electrical Parameters
  4. 3Application Schematic
  5. 4EVM Picture
  6. 5Test Setup and Procedure
    1. 5.1 EVM Test Setup Schematic
    2. 5.2 Test Equipment
  7. 6Test Data and Performance Curves
    1. 6.1 Efficiency
    2. 6.2 Output Regulation and Cross-Regulations
    3. 6.3 Steady-State Waveforms
    4. 6.4 Start-Up Waveforms
    5. 6.5 Dynamic Responses
    6. 6.6 Short-Circuit Protection
    7. 6.7 Bode Plots
    8. 6.8 Thermal Image
  8. 7Schematic
  9. 8Bill of Materials
  10. 9EVM Layout

1 Introduction

The LM5157EVM-FLY supports the following features and performance capabilities:

  • Tightly-regulated main output voltage Vo1 = 10 V ±1%
  • Three cross-regulated, isolated output voltages:
    • Vo2 = 20 V
    • Vo3 = 20 V
    • Vo4 = 20 V
  • Total rated load 8.5 W:
    • 250 mA at Vo1
    • 75 mA at Vo2
    • 75 mA at Vo3
    • 150 mA at Vo4
  • Peak efficiency > 90%
  • Optional hiccup mode overloading protection
  • 250-kHz switching frequency
  • 2-layer PCB, 3.5 × 2.3 in