Description
8
SNOU166 – February 2019
Copyright © 2019, Texas Instruments Incorporated
LMG3411R150-031 EVM user guide
2.2
LMG34XX-BB-EVM
To allow for quick operation the LMG34XX-BB-EVM is available to interface with the LMG3411EVM-031.
This mother board is designed to operate the LMG3411R150 as a synchronous open loop buck converter.
Easy probe locations are provided for measurement of logic and power stage voltages.
2.2.1
Bias Supply
The motherboard requires one 12V bias supply. When the LMG3411EVM-031 is configured in bootstrap
mode the 12V input is used to power the two LMG3411R150 devices. A linear drop off regulator steps the
voltage down to a tightly regulated 5V for logic power of the LMG3410R150. When the LMG3411EVM-031
is configured in isolated power supply mode the 5V is also used for auxiliary power for the top
LMG3411R150 Q1.
2.2.2
Logic PWM Input
The LMG34XX-BB-EVM supports a single PWM, with complimentary signal and corresponding dead time
generated on board. A 0 V to 5 V magnitude input square wave is required. The complementary PWM
generation circuit creates 50 ns of dead time between both transitions of the PWM signals.
2.2.3
Fault Protection
There is an option to disable PWM input to the FET card in the event of a fault signal from the
LMG3411EVM-031. When the FAULT Protect jumper is placed in the EN mode PWM is disabled when
either LMG3410R050 has an active fault. This disable is not latching, so when the fault clears PWM
immediately resumes. If FAULT Protect mode is not desired it can be disabled by placing the jumper in
the DIS position. The FAULT LED will still illuminate when either LMG3411R150 has an active fault,
regardless of the position of FAULT Protect jumper.
2.3
Typical Applications
The LMG3411EVM-031 is designed for use in AC/DC, DC/DC and DC/AC applications.
•
Totem-Pole PFC converters
•
Phase-Shifted Full Bridge or LLC Converter
•
Buck converter such as the LMG34XX-BB-EVM
2.4
Features
The LMG3411EVM-031 has the following features and specifications:
•
Two options to bias the LMG3411, from bootstrap diode or using isolated power
•
Over temperature, overcurrent, and under voltage lockout protection with FAULT indication that is level
shifted to an AGND referenced signal
•
Gate logic input support of either 3.3V or 5V logic
•
Maximum recommended operating voltage of 480V and absolute maximum voltage of 600V
The LMG34XX-BB-EVM has the following features and specifications:
•
Requires only a single 12V bias supply
•
Requires only a single 0V to 5V PWM input to generate gate drive signal
•
PWM disable in the event of a fault from the LMG3411EVM-031
•
Maximum recommended operating voltage of 480V and absolute maximum voltage of 600V
•
Maximum recommended operating inductor current of 5A