SNOU150D January   2018  – April 2025 LMG1020

 

  1.   1
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  4. 3 General TI High Voltage Evaluation User Safety Guidelines
  5. 4 Safety and Precautions
  6. 5 Electrical Performance Specifications
  7. 6 EVM Operation Out-of-the-Box
  8. 7 EVM Schematic
  9. 8 EVM Kit Contents
  10. 9 Test Setup
    1. 9.1 Test Equipment
    2. 9.2 Recommended Test Setup
    3. 9.3 List of Test Points
    4. 9.4 List of Terminals
  11. 10Test Procedure
    1. 10.1 Nanosecond Pulse Measurements
    2. 10.2 Pulse Shortener
    3. 10.3 Shutdown Procedure
      1. 10.3.1 Components rating and DNPs
  12. 11Performance Data and Typical Characteristics
  13. 12EVM Assembly Drawing and PCB Layout
  14. 13List of Materials
  15. 14Trademarks
  16. 15Revision History

2 Description

The LMG1020EVM-006 is a small, easy-to-use power stage that comes with a place to populate a resistive load, representing a typical Lidar laser diode load, as well as a place to populate a laser diode. Section 6 explains the procedure to set up the board out-of-the-box and accommodate the resistive load. The unpopulated resistive load will help achieve the applications required pulses before populating and powering the laser diode. The EVM takes a short-pulse input that can either be buffered (and shortened), or passed directly to the power stage.

The input pulse signal is used to pulse the current through the load (not populated out-of-the-box), to achieve 1-ns to 2-ns wide current pulses, which are the state-of-the-art target for LiDAR systems.

The EVM features a LMG1020, driving a single EPC2019 FET referenced to ground and with the drain connected to the unpopulated resistive load.

The board comes with a place to populate a resistive load, as well as larger pads where a laser diode of choice can be mounted. The load (when populated) is split between two current loops to reduce the effective inductance.

LMG1020EVM-006 LiDAR Power Stage with LMG1020Figure 2-1 LiDAR Power Stage with LMG1020

The power stage can deliver up to 40 A of current to the load (when populated) at duty cycles ~0.1% and frequencies up to 2MHz. It includes adequate thermal management (case temperature should be monitored and adequate airflow should be ensured).