Do More with a GaN Power Stage

re: Do More with a GaN Power Stage by rscasny

rscasny — Thu, 15 Feb 2018 22:36:42 GMT

Questions and Answers from the Webinar

How are you reducing the EMI emissions at the high switching speeds?
- TI’s method of integrating driver into FET package eliminates common-source inductance as well as induction between driver output & gate, and driver grounding. This reduces switch node ringing thus reducing EMI. The LMG3410 also provides a RDRV pin option, for slew rate adjustability from 30-100V/ns.

Are they to be used as switching FETs, or also in the linear regulation range?
- GaN FETs and power stages are ideal for switching applications, linear regulation range is not as common.

Do you have any references design for solar inverter
- TI currently does not have any solar inverter specific reference designs, but the LMG3410 HB EVM card as well as other reference designs can certainly get you started with a solar inverter prototype.

Does TI provide discrete GaN FETs or only integrated solutions?
- TI does not provide discrete GaN FETs, but TI does provide discrete GaN drivers along with our integrated GaN power stage.

Sorry I got here late, how are you keeping the oscillations low?
- By minimizing the layout of the gate and power loop, you’re able to keep parasitic inductance very low thus reducing oscillations.

Does TI choose Cascode technology for GaN power device and why?
- No, TI utilizes direct drive technology for our GaN devices. Direct drive allows for higher switching power efficiency, and better system level reliability.

Is TI working with Transphorm/EPC/etc. to advance GaN technologies or is research and fab being done independently?
- TI’s high voltage GaN process is completely internally developed and manufactured by TI.

Have any power designs been completed while taking advantage of the very high switching speeds available (MHz range?)?
- TI has released a complete high density AC/DC solution design, both operating at 1MHz including our CrM PFC design, and our LLC design. We are currently developing designs in mulit-MHz range.

Both designs can be found here: http://www.ti.com/tool/TIDA-00961, http://www.ti.com/tool/PMP20637