LAUNCHXL-F28379D: FCL Current Loop Bandwidth

Bui Van Linh

Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: SFRA

Hello experts,

I compared both FCL examples.

And I see that the calculations of the current loop bandwidth are very different. Once the factor is equal to 18 and other time 100. It means for me that the bandwidth is an adjustable parameter. It is also logical. But it raises the question for me how to choose the factor reasonably. Is the factor 1 or 5 or maybe .... also OK or not? Is there maybe further documentation or hints about the selection of the factor?

Many thanks in advance - Bui

over 2 years ago

0 Jiaxin Teng over 2 years ago

TI__Expert 4720 points

Hi Bui,

The default setting for the bandwidth is 1/18 of the sampling frequency. You can tweak it to attain different current loop bandwidth. The value depends on how you design the current control loop. Currently there is no documentation from TI on how to determine an optimal value of the factor.

Thanks,

Jiaxin

0 Bui Van Linh over 2 years ago in reply to Jiaxin Teng

Intellectual 660 points

Hi Teng,

thank you very much for the quick reply!

There must be some theoretical background why the factor equal to 18 was chosen. Can you give me some tips or hints as food for thought to think further.

Regards - Bui

0 Jiaxin Teng over 2 years ago in reply to Bui Van Linh

TI__Expert 4720 points

Hi Bui,

You are welcome. There is no record on how 18 was selected. It is set based on our reference design setup. You may use the SFRA tool to pick a value that is suitable for your system.

Thanks,

Jiaxin

+1 Bui Van Linh over 2 years ago in reply to Jiaxin Teng

Intellectual 660 points

Hi Teng,

thanks - Bui

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LAUNCHXL-F28379D: FCL Current Loop Bandwidth