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LMG3410R070: GaN Synchronous Buck Converter models + pin connections for BBSW and pad

Stuart Toms
Prodigy 10 points
Part Number: LMG3410R070
Other Parts Discussed in Thread: PSPICE-FOR-TI, TINA-TI

Hello,

I want to simulate a synchronous Buck converter using two LMG3410R070 GaN FETs. Please can you answer the following questions:

1) I have downloaded a LMG3410 buck converter simulation file (TINA_TI SNOM608B.TSC) from the LMG3410 product page. This file contains an encrypted circuit model and requires TINA_TI version 15.7 or higher to run. I can only find TINA-TI version 9.3.200.277 SF-TI available to download from the TI website. Please can you tell me where I can find TINA-TI version 15.7 or later for free download. If TINA-TI is obsolete then I will have to use Pspice or Pspice-for-TI instead.

2) The LMG3410R070 datasheet (page 19) says “the LMG3410’s internal buck-boost converter requires a 22uH inductor to be connected to the BBSW pin to help generate the VNEG to ensure good turn off of the GaN FET”. This 22uH inductor is shown on the example half-bridge circuit in Figure 14 of the LMG3410 datasheet (attached). However the TINA-TI Buck converter simulation schematic SNOM608B.TSC (attached) shows the LMG3410 with no 22uH inductor connected to the BBSW pin. Instead the BBSW pin is connected directly to the source pin of each LMG3410 FET. Please confirm if the 22uH inductor is always required when using the LMG3410 and particularly in a synchronous Buck converter.  Is the TINA-TI Buck schematic incorrect?

3) In the example half-bridge circuit in Figure 14 of the LMG3410 datasheet (attached) the pad, pin 33, of the high side GaN FET is connected to the source pins but the TINA_TI SNOM608B.TSC schematic (attached) shows the high side GaN FET’s pad connected to system ground. Is it preferable for the high side thermal pad to be connected to the Source pad?

Thanks,

Stuart