• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 477 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28063: UCC28063 Circuit review: output Cap-less (20uF ↓)

KIM Andy
Expert 2530 points
Part Number: UCC28063

Hi 

UCC28063 is designing a circuit with 420V output.(Typ. 270W, Peak 460W))

Request circuit review.

There seems to be a lot of noise in the current GND pattern.

Since the concept of this circuit is small, I want to design it to 20uF or less. In the current state, when the load is increased by about 130 W, ic is dead. Could it be improved? Could it be due to the noise of this pattern?

Adding an output capacitor in the circuit resulted in a normal output. But I want to design with Cap-less.

Schematic diagrams and patterns are also attached.270W_REV0.1_PCB TOP PCB BOTTOM PDF_170704.pdf (2).pdfPCB9_MPN(269W)_회로도 (2).pdf

  • 0
    TI__Mastermind 25570 points
    Hi Andy

    Yes, Noise in the system could disrupt the controller for sure. I see on the layout that the VCC decoupling capacitors are a long way from pin 12 and the return path from the caps is also quite long. I'd suggest you remove these parts from where they are and locate them at the device pins - temporarily of course.

    I would also advise you to look at the power stage switching waveforms, you can do this at partial power too of course.

    You could also turn off PHB or PHA - remove the gate drive resistors and run a single phase at 'full power' - 230W - and see if one phase is causing the problem.

    Was there any other damage ?

    The GDA and GDB lines run under the IC for a short while - this is not normally reccomended.

    Regards

    Colin