Test Procedure
14
SNVU637 – October 2018
Copyright © 2018, Texas Instruments Incorporated
Using the LMG3411EVM-029 Half-Bridge and LMG34XX-BB-EVM Breakout
Board EVM
5
Test Procedure
5.1
Setup
The following procedure is recommended to set up the LMG34XX-BB-EVM with the LMG3411EVM-029:
•
Connect LMG3411EVM-029 to LMG34XX-BB-EVM
•
Connect oscilloscope or multimeter probes to desired test points as shown in A or G
•
Connect the 12 V bias supply, load to the output, and input supply to the input
•
Connect the function generator to either the BNC connector PWM input at C or 100 mil header
connector input at pin 6 (PWM) and pin 5 (GND) at B.
•
Enable an external fan to direct airflow across the heat sink attached to the LMG3411EVM-029
5.2
Startup and Operating Procedure
The following procedure is recommended to enable the LMG34XX-BB-EVM with the LMG3411EVM-029:
1. Power up the 12 V bias supply. Ensure the top right green “Aux Enable” LED is illuminated.
2. Enable PWM on the function generator
3. Power up high voltage input supply. Ensure the red “HV Enable” LED is illuminated when the input
supply is above 20 V.
WARNING
Do NOT turn on device at absolute maximum voltage. It is
recommended to start at voltages at or below 480 V, and then
increase the input voltage slowly while monitoring V
SW
to insure the
peak voltage does not exceed the absolute maximum rating of 600
V.
5.3
Shutdown Procedure
1. Turn off input supply then PWM. Wait until red “HV Enable” LED turns off.
2. Disable 12 V bias supply.
5.4
Additional Operation Notes
•
Fault protection on the LMG34XX-BB-EVM is not latching, so if a fault clears and the LMG34XX-BB-
EVM is still operational PWM will resume.
