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UCD3138HSFBEVM-029: converting closed loop to open loop configuration

Part Number: UCD3138HSFBEVM-029

Hi all ,

I want to test some sample code on UCD3138HSFBEVM-029. How can i operate this evaluation board in open loop ? do i need to rearrange the jumpers such that  the controller is completely disconnected from power stage ? Kindly guide me thorugh this.

Regards

Rohan

  • Hi Ashish,

    I am sending your request to an AE to help respond.
  • Hi Ashish,

    I moved your question into the Digital Power Forum, you should see a response soon.
  • It's best to go to open loop by changing the firmware. 

    One easy way is to change the OUTPUT_CLAMP_HIGH and OUTPUT_CLAMP_LOW bit fields to the same value, which is whatever value you want the filter to output to the DPWM.  You can do this with the memory debugger.

    In our labs, we change the filter so that it only has  P coefficient, no I or D, so it just passes through the input.  Then we can switch the filter to CPU_SAMPLE mode, and control the output by changing the CPI_SAMPLE value. 

    If you want to run the program open loop on an open loop board, instead of the EVM, or if you want it to ignore faults, you have to change the code for the faults as well.