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non-isolated power supply for AMC1200 in Moter drive application

Di Wang
Expert 1740 points
Other Parts Discussed in Thread: AMC1200, UCC27714

Hi,

The Vbus is 400V, I chose high-side low-side gate driver (like UCC27714) for a non-isolated application.Can I use the stored energy between HB and HS of UCC27714 (Cboot) to power VDD1/GND1 of AMC1200? I will add a linear regulation for better regulation and noise.

In fact, I'm considering if I could remove the isolated power supply for a non-isolation requested situation. From below schematics, it may work.

Thanks.

  • 0
    TI__Guru** 114905 points
    Hi Di,

    Your post has been moved for better support.
  • 0
    TI__Intellectual 2910 points
    Di Wang,

    Thank you for incorporating the UCC27714 driver into your design. I understand they way you are thinking of using the HB supply and find it quite clever. There is nothing preventing this use from the UCC27714's perspective. However, note that the bootstrap resistor, diode, and capacitor will have to be selected taking into consideration the current needs of the AMC1200. I would suggest keeping a small (~100nF) ceramic cap as close as possible to the HB and HS terminals on the UCC27714, another one at the AMC1200, and a footprint for a larger cap in the uF range in case you find you need a bulk bypass cap.

    If the HB-HS voltage does not satisfy the HB UVLO, the driver will not give any outputs, so this will be the determining factor in making this proposed approach successful. If you already have a board that uses a floating supply for the AMC device, I recommend trying out this idea with wiring modifications.

    I hope this post helps answer your question. If it has, please press the "Verify Answer" button below.

    - Daniel