Texas Instruments LMG352 EVM-04 Series, User Manual

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8.1.1 List of Test Points
Key test points on this EVM are designed for oscilloscope probes with short ground springs. Using short ground
springs instead of alligator ground leads will minimize measurement error and produce a cleaner signal with the
fast switching GaN devices used on this EVM. The data in this user guide uses this measurement method.
Table 8-1. Test Point Functional Description
NAME DESCRIPTION
VAUX 12-V bias input connection before filter
ACMGND Ground for 12-V bias input before filter
5V 5-V bias
AGND1 Analog ground for logic
PWM Single input PWM signal
LDEAD1 Low-side PWM signal before dead time generation
AGND3 Analog ground for logic
HDEAD1 High-side PWM signal before dead time generation
AGND4 Analog ground for logic
LOW Low-side PWM signal with dead time
HIGH High-side PWM signal with dead time
AGND2 Analog ground for logic
12V 12-V bias after filter
PGND1 Power ground
HVIN DC input voltage
PGND2 Power ground
HVOUT DC output voltage
PGND3 Power ground
SW1 Switch node voltage
For this EVM version, not all the test points are available on the motherboard due to the size of the daughter
card. To probe the switching node, TI recommends using a pigtail on the daughter card on PGND pin. A probe
could use the PGND pigtail and SW test point on the daughter card to complete the measurement.
8.1.2 List of Terminals
Table 8-2. List of Terminals
TERMINAL NAME DESCRIPTION
J1 VIN Input DC voltage input
J5 VOUT Output DC voltage output
J6 12V AUX 12-V bias voltage input
J3 PWM INPUT Single 0-V to 5-V PWM input for gate
J4 LOGIC Header to connect PWM, FAULT logic
J2 HB Card PIN Connector to interface LMG352XEVM-04X board
8.2 Start-Up and Operating Procedure
The following procedure is recommended to enable the LMG352XEVM-04X with the LMG352XEVM-04X:
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 the high voltage input supply. Ensure the red “HV Enable” LED is illuminated when the input supply
is above 20 V.
www.ti.com Test Procedure When Paired With LMG34XX-BB-EVM
SNOU178A – OCTOBER 2020 – REVISED FEBRUARY 2021
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LMG352XEVM-04X User Guide 21
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