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Isolated Bias Supply Solutions for GaN MOSFET Gate Drivers

Unnimaya V
Prodigy 240 points
Other Parts Discussed in Thread: UCC25800-Q1, UCC14131-Q1

Hi Expert ,


Could you please recommend Isolated Bias Supply Solutions  for  GaN  MOSFET Gate Drivers?

Kind regards,
Unnimaya.V

  • 0
    TI__Expert 4855 points

    Hi Unnimaya, 

    You may have a look at PMP23209 or PMP23216 reference designs for GaN half-bridge isolated bias supplies. They provide a relatively simple and reliable solution by using a single UCC25800-Q1 device.

    Best Regards,

    John

  • 0 in reply to John Gomez
    Prodigy 240 points

    Hi John ,

    We already tried with UCC25800-Q1. It seems that During No-load to Full load not getting a tight regulation even  with Zener or shunt regulation (There will be always 1V variation at the output while moving from Full load to no load.)

    We Have 12 loads(Total 7W requirement), with UCC25800-Q1  the power density is less for our application. Efficiency is pretty good for UCC 25800-Q1

    Our input voltage vary from 9V-16V so a Boost is required at the input side of the UCC25800-Q1 this further decreases the power density.

    Since our application demanding more power density ,Could you please suggest an alternative for UCC25800-Q1 for GaN Driver bias supply?

    Kind Regards,
    Unnimaya.V

  • 0 in reply to Unnimaya V
    TI__Expert 4855 points

    Hi Unnimaya, 

    What are the 12 loads? Are they all integrated GaN devices? 

    Please provide a bit more information on how you would like the final implementation to look like. I have added our bias supply team to provide more information. 

    Best Regards,

    John

  • 0 in reply to John Gomez
    Prodigy 240 points

    Hi John,

    Thank you for the response.

    We Have 12 loads of 7W

    1).  6 GaN drivers Driving the Cascode GaN (12V),
    2).  2 Sensing chip (21V) ,
    3).  2 DSP bias (3.3,5V),
    4).  1 Safety switch (12V)

    Our input supply is 9V-16V.

    We need a tight regulation from full load to no-load(quiescent state) 1% regulation and High power density as possible.


    Your timely response would be greatly appreciated.

    Kind Regards,
    Unnimaya.V

  • +1 in reply to Unnimaya V
    TI__Genius 15416 points

    Hi Unnimaya,

    I recommend using UCC14131-Q1 to bias the 12V GaNs. It provides higher power density as it has the transformer integrated. To improve the power capabilities, I recommend using a pre-regulator between the output of the switch and the input of the UCC14131-Q1 to regulate the input voltage of the UCC14131-Q1 to 12V. You can use a SEPIC for this. Alos, you would need to use more than one UCC14131-Q1 to meet the power demands.