2.2 Mother Boards
Two mother boards are available from TI: LMG342X-BB-EVM and LMG34XX-BB-EVM.
Note
TI provides a custom interposer board that must be used when the LMG352XEVM-04X is paried with
the LMG34XX-BB-EVM. The interposer board is not needed with LMG342x-BB-EVM.
2.2.1 Bias Supply
The motherboard requires one 12-V bias supply. A linear dropout regulator (in LMG34XX-BB-EVM) or buck
regulator (in LMG342X-BB-EVM) steps the voltage down to a tightly regulated 5-V for the logic and auxiliary
power of the LMG352XR0X0 when the LMG352XEVM-04X is configured in isolated power mode.
2.2.2 PWM Input
Both LMG342X-BB-EVM and LMG34XX-BB-EVM mother boards have on-board complementary PWM
generation circuits that create a pair of complimentary PWM signals out of a single PWM input. A 0-V to 5-V
square wave input is recommended. In LMG34XX-BB-EVM, the default dead time is 50ns, and other values are
achievable by changing the resistance values (R1 and R5). In LMG342X-BB-EVM mother boards, the dead time
can be easily adjusted by tuning the trimmer resistance values (R3 and R15).
2.2.3 Fault Protection
There is an option to disable the PWM input to the daughter card in the event of a fault signal from the
LMG352XEVM-04X. When the FAULT Protect jumper is placed in the EN mode, PWM is disabled when either
LMG352XR0X0 has an active fault. This disable is not latching, so PWM immediately resumes when the fault
clears. If the FAULT Protect mode is not desired, that mode can be disabled by placing the jumper in the DIS
position. The FAULT LED will still illuminate when either LMG352XR0X0 has an active fault, regardless of the
position of FAULT Protect jumper.
2.3 Typical Applications
The LMG352XEVM-04X is designed for use in AC/DC, DC/DC and DC/AC applications:
• Totem-Pole PFC Converters
• Phase-Shifted Full Bridge or LLC Converters
• Inverters
• Buck or Boost Converters
2.4 Features
The LMG352XEVM-04X has the following features and specifications:
• Overtemperature, overcurrent, short-circuit, and undervoltage lockout protection with FAULT and OC
indication that is level-shifted to an AGND referenced signal
• A real-time digital output with its duty cycle indicating the device's junction temperature
• Cycle-by-cycle overcurrent protection and latched short-circuit protection
• Gate logic input support of either 3.3-V or 5-V logic
• Maximum recommended operating voltage of 520-V and absolute maximum voltage of 650-V
The mother boards have the following features and specifications:
• Requires only a single 12-V bias supply
• Requires only a single 0-V to 5-V PWM input to generate a gate drive signal
• PWM disables in the event of a fault from the LMG352XEVM-04X
• Maximum recommended operating voltage of 520-V and absolute maximum voltage of 650-V
Introduction
SNOU178A – OCTOBER 2020 – REVISED FEBRUARY 2021
LMG352XEVM-04X User Guide
9
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