SLVUBZ2A September   2020  – December 2020 LM5127-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Applications
    2. 1.2 Features
  3. 2EVM Setup
    1. 2.1 EVM Characteristics
  4. 3EVM Photo
  5. 4Testing Procedures
    1. 4.1 EVM Connectors and Test Points
  6. 5Test Results
    1. 5.1 Efficiency
    2. 5.2 Thermal Performance
    3. 5.3 Steady State
    4. 5.4 Load Transient
    5. 5.5 Line Transient Responses
  7. 6Schematics, PCB Layers, and Bill of Materials
    1. 6.1 Schematics
    2. 6.2 PCB Layers
    3. 6.3 Bill of Materials
  8. 7EVM Modifications
    1. 7.1 Configure Channel 1 as a Buck Controller
      1. 7.1.1 Component Modifications
      2. 7.1.2 CFG/MODE Pin Selection
    2. 7.2 Configure Channel 2 and Channel 3 as a Dual Phase Buck Controller
      1. 7.2.1 Component Modifications
      2. 7.2.2 CFG/MODE Pin Selection
    3. 7.3 EVM Modification Test Setups
  9. 8Revision History

1 Introduction

The LM5127EVM-FLEX is designed for use with a wide input voltage range of 3 V to 42 V to produce two tightly regulated output voltages of 5 V at 5 A and 3.3 V at 7 A. Figure 1-1 shows the standard configuration of the LM5127EVM-FLEX. It is configured as a typical front end power supply in 12 V automotive applications. Channel 1 implements a synchronous pre-boost, supplying adequate voltage for the two synchronous buck controllers (channel 2 / channel 3) to maintain output regulation for input voltage transients as low as 3 V. The free-running switching frequency is 440 kHz and synchronization to an external clock signal is possible at higher or lower frequency. The main discrete power-train components (inductors and MOSFETs) are automotive AEC-Q200 rated.

GUID-20200911-CA0I-XVQ5-DBQV-DZSP9TD77WVH-low.gifFigure 1-1 Typical Application Circuit