Test Setup
12
SNOU165A – September 2018 – Revised March 2019
Copyright © 2018–2019, Texas Instruments Incorporated
Using the LMG341xEVM-018 half-bridge and LMG34XX-BB-EVM breakout
board EVM
The LMG34XX-BB-EVM power and probe connection points are shown in
.
Figure 8. Recommended Connection Points
PCB Notes:
•
Probe points for gate drive logic
•
100 mil header for PWM input, PWM signals to LMG341xEVM-018 and FAULT output
•
BNC connector for PWM input
•
12V bias supply input
•
FAULT Protection option header
•
Power stage high voltage input
•
Probe point for power stage switch node
•
Power stage high voltage output
WARNING
There are very high voltages present on the EVM. Some
components reach temperatures above 50°C. Precautions must be
taken when handling the board.
4.3
List of Test Points
Key test points on this EVM have been designed for use with oscilloscope probes with short ground
springs. Using the short ground spring instead of the alligator ground lead will minimize measurement
error and produce a cleaner signal with the fast switching GaN devices used on this EVM. The data
shown in this user guide has been obtained using such a measurement method.
