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

11 Performance Data and Typical Characteristics

Figure 11-1 through Figure 11-4 present typical performance curves for LMG1020EVM-006.

LMG1020EVM-006 90-ns Pulse from Function Generator Yielding 15-ns Pulse on the GateFigure 11-1 90-ns Pulse from Function Generator Yielding 15-ns Pulse on the Gate
LMG1020EVM-006 84-ns Pulse from Function Generator Yielding 1.5-ns Pulse on the GateFigure 11-3 84-ns Pulse from Function Generator Yielding 1.5-ns Pulse on the Gate
LMG1020EVM-006 90-ns Pulse from Function Generator Yielding 15-ns Pulse on the GateFigure 11-2 90-ns Pulse from Function Generator Yielding 15-ns Pulse on the Gate
LMG1020EVM-006 1.2-ns Gate Pulse Yielding 1.5 ns, 30 V into 1-Ω Pulse (500-MHz Scope)Figure 11-4 1.2-ns Gate Pulse Yielding 1.5 ns, 30 V into 1-Ω Pulse (500-MHz Scope)

Figure 11-1 through Figure 11-3 show how the input stage performs and how the buffer cleans up and shortens the input pulse. This allows the use of a function generator with lower specifications.

Figure 11-4, taken with a 500MHz oscilloscope, shows typical operation waveforms. On the (K) waveform it is possible to see a 20V overshoot, this is due to the inductance in the power loop. Vg seems to be oscillating, but this is caused by pickup noise, which is inevitable even when using a spring ground connection. The expected resonant frequency for the gate loop is ~70-90MHz (given Gate capacitance of ~10nF and Gate inductance of 3-5nH), the oscillation observed is at 250MHz, which would imply a gate loop inductance of ~40pH. This is therefore pickup noise.