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

10.1 Nanosecond Pulse Measurements

WARNING:

Before populating the EVM with a laser diode, read the out-of-the-box procedure to set the board up correctly before powering the laser diode, found in Section 6.

The following procedure is used to obtain and measure nano-second(s) pulse at the output:

  1. Connect the input(J2) and bias supplies(J1) as shown in Figure 9-1, but do not power them on yet.
  2. Power up the DC bias supply (J1) maintaining it in the 5.5 V to 15 V range and setting the current limit to 0.1 A.
  3. Connect the function generator and apply the following settings:
    • Frequency to 100 kHz
    • Signal range 0 V to 3 V
    • Pulse width 100 ns
    • Enable the output
  4. Power up the input supply(J2) (as shown in Figure 9-1) and set to the desired input voltage, but no higher than 75Vdc. Set the current limit to 0.2 A. It is recommended to begin measurements at lower voltage, such as 10 V to ensure the correct waveforms are being captured.
  5. Tune the length of the pulse on the function generator, so that the Cathode voltage pulse is reduced to the desired width, this will be close to 1-2ns. Notice that if a resistive load is populated, the rising edge of the pulse is given by the RC constant of the load in series with the COSS of the FET.
  6. Perform the desired measurements