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12V Input
High Voltage
Input
7.2 Start-Up and Operating Procedure
1. Turn on +12VDC to the LMG342X-BB-EVM. Watch the power supply for the DC current to settle down after
approximately 3 to 5 seconds.
2. Make sure all the fault LEDs are off and the 5-V LED is on.
3. Turn on +12VDC to enable the fan.
4. Turn on the function generator to output the continuous pulse, and check the deadtime of the PWM signals.
5. User proper probes for measurement. To measure the fast switching transient in the switch-node, it
is recommended to use the high-bandwidth high-voltage passive probes with minimized ground loop
connections.
6. It is recommended to add common-mode chokes to the measurement signals and to the power input/output
connections.
7. Enable the high voltage power supply and make sure to ramp the voltage up gradually from 0V to the
desired bus voltage (up to 480V). As the voltage is ramping up, the HV LED will turn on and become
brighter.
Figure 7-3. Switch-Node Voltage Measurement with High-Bandwidth Probe and Pigtail Ground
SNOU176B – OCTOBER 2020 – REVISED MARCH 2022
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5V LED Fault LEDs
Low side
High side
Daughter Card
PWM
PWM
Figure 7-2. Connector and LEDs on the LMG342X-BB-EVM
Connection
Copyright © 2022 Texas Instruments Incorporated
Test Procedure When Paired With LMG342X-BB-EVM
Pin1 of J7 & J14
Connector
LMG342XEVM-04X User Guide
17
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