TIDM-DC-DC-BUCK: Why BUCK_DCL_DEFAULT_PID_SCALE value is 10.0

tim.peng

Prodigy 30 points

Part Number: TIDM-DC-DC-BUCK

Reference design TIDM-DC-DC-BUCK:

In buck_user_settings.h line 469

#define BUCK_DCL_DEFAULT_PID_SCALE ((float32_t) 10.0)

I want to know why the default PID value is 10.0?

Thanks,

Tim

over 2 years ago

0 Peter Luong over 2 years ago

TI__Mastermind 22631 points

Hi Tim,

Let me look into this question for greater detail about why this specific value was chosen. In the meantime, please refer to our DCL user guide document for further questions

Regards,

Peter

+1 Peter Luong over 2 years ago in reply to Peter Luong

TI__Mastermind 22631 points

Hi Tim,

Thank you for your patience. This BUCK_DCL_DEFAULT_PID_SCALE value is simply used to scale the values of Kp, Ki, and Kd so that the values displayed in the debug expressions menu is more easily readable. This scale value does not impact the PID performance, but please note that this is the intended default scale value for running the labs. Altering this value will deviate what is seen in the CCS debug menu from what is displayed in the lab guide. See below note from user guide:

Regards,

Peter

0 tim.peng over 2 years ago in reply to Peter Luong

Prodigy 30 points

Thank your Peter!

This issue has been solved.

Regards,

Tim

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TIDM-DC-DC-BUCK: Why BUCK_DCL_DEFAULT_PID_SCALE value is 10.0