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UCC28951-Q1: Isolated Gate Driver UCC21520-Q1

Nishanth M
Intellectual 295 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC21520-Q1, UCC28951, UCC21520

Hi,

We are using the UCC21520-Q1 Isolated Gate driver for the UCC28951 PSFB. Shall we use single isolated DC to DC at the Primary side for both Gates power VDDA & VDDB. Putting series diode for the VDDA as shown in the below image. Please check and let us know the comments...

Kind Regards,

Nishanth M

  • 0
    TI__Expert 6220 points

    Hi Nishanth, 

    You can use one power source and a bootstrap circuit to create bias supply for the secondary side (VDDA/VDDB). You can refer to this page and this page of the UCC21520 datasheet to select values for the bootstrap resistor and capacitor.

    Thank you! 

    Vivian