7 Test Procedure When Paired With LMG342X-BB-EVM
7.1 Setup
The inductor on LMG342X-BB-EVM is capable of around 3-kW operation. For higher power levels, use an
external inductor.
TI recommends the following procedure to set up the LMG342X-BB-EVM with the LMG352XEVM-04X:
1. Connect the LMG352XEVM-04X to LMG342X-BB-EVM as shown in
.
2. Install the LMG342X-BB-EVM inside a ventilated HV safety box.
3. Disconnect jumper J13 to enable the 12-V to 5-V on-board power conversion.
4. Disconnect jumper J12.
5. If the on-board complementary PWM generation circuits are used to generate the dead time, please connect
Pin 2 to Pin 3 for header J7 and J14 with jumpers. Under this configuration, only one PWM signal is required
and it can be connected to either J3 or J8.
6. If two complementary PWM signals with dead time are provided to J3 (high-side PWM) and J8 (low-side
PWM), then please connect Pin 1 to Pin2 for header J7 and J14 (Pin1 of J7 and J14 are indicated in
). This allows the two PWM signals to directly control the high-side and low-side devices.
7. If fault interlock feature is desired, please connect jumper J10 and J11. Otherwise, disconnect them and the
PWM signals can always pass through to the devices.
8. Set the signal generator to a desired frequency and duty cycle (e.g. 100 kHz, and 50% duty cycle). 5-V for
high input and 0-V for low input.
9. Connect the signal generator output to the LMG342X-BB-EVM PWM input as shown in
.
10.Connect 12-V, 2-A DC power supply to the LMG342X-BB-EVM 12-V bias supply as shown in
11.Connect the high voltage power supply to the LMG342X-BB-EVM high voltage input for buck mode (High
Voltage) as shown in
.
12.Provide 12-V bias supply to fan by connecting the 3-pin power cord from fan to J15.
Figure 7-1. LMG342X-BB-EVM Motherboard With LMG352XEVM-04X
Test Procedure When Paired With LMG342X-BB-EVM
SNOU178A – OCTOBER 2020 – REVISED FEBRUARY 2021
LMG352XEVM-04X User Guide
15
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