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UCD9240 & PTD08A010W : questions for AFE & CL

Other Parts Discussed in Thread: PTD08A010W, UCD9240, UCD7230

Dear Sir,

I have tried to make a board with UCD9240 & PTD08A010W for the power supplies.

For the 1st trial, I've tried to configured a rail #1 to 1.2V.  After setting the Configuration,

I guess I need to set the 'Design' tab for the regulation and soft start/stop.  After selecting

PTD08A010W as a driver, it shows me a dialog box with many parameters to notice me

a discrepency between hardware and configuration data.  I guess those parameters are

for the CLA and AFE gain.  A little complicate for me to understand all of them.  How to know

and make a good decision to identify whether those parameters are suitable?

Thank you.

Peter Chang

  • The discrepancy is possibly due to "Write to Hardware" button was not clicked after a change is made. You can accept the changes and make sure the Design and CLA are in sync.

    You do not need to directly set CLA parameters. You can set compensator zero frequencies in the GUI, and examine whether it is a good design based on Bode plot as you would with an analog controller. You can also use Auto Tune feature as a starting point of the design. 

    First design compensator in Bank 0x1 (regulation), then use the same compensator design in Bank 0x0 (soft start) except that we recommend to use Linear Gain option. 

    For details please refer to the user's guide: 

    Regards,

    Zhiyuan

  • Hi Zhiyuan,Thanks for your answer. I got one user's guide. Thanks.
    Do you mean that I can either set compensator zero frrequency or auto tune to get
    CLA parameters automatically.? Then I can check whether the bode plot meets our
    requirements. About the zero frequency in manual mode, should I use complex
    or real zero? I think the answer may refer to the bode plot. Many thanks.
    Peter Chang
  • Hi Zhiyuan,
    One further question, if I don't choose any driver in the power stage block,
    can I have any output on my board or on the monitor?
    I have the question, because the reference program I got
    from Xilinx for the SP605 does not set a correct driver.
    I set it to UCD7230. We, however use PTD08A010W.Why? Peter Chang
  • You can select correct power module in Fusion GUI. PTD module uses UCD7230 driver, so after you choose PTD module, the schematic will show UCD7230 inside the module.
  • The difference between complex and real zeros are explained in the user's guide. In short, complex zeros include but are not limited to real zeros. All real zeros can be expressed in the form of complex zeros.
  • Hi Zhiyuan,

    Many Thanks.

    Peter Chang