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Original question:

CCS/SFRA: Hi, guys, I wander the communication mechanism of the DSP and SFRA software.

CCS/SFRA: How to measure successfully the frequency response of the buck converter based on SFRA

user6184829
Prodigy 70 points
Part Number: SFRA

Tool/software: Code Composer Studio

Dear Support,

I am using the SFRA tool to obtain the plant and open loop frequency response of the buck converter system controled an F28035.According to the SFRA Module User ‘s Guide,I have added the necessary codes and function.Now ,I find the results measured recently are different from the ideal outcoms. But the whole system is not stable and has strong oscillation,so,I cannot use the Compensation Designer to design compensator.    

Therefore, could you please provide me with an assist about how to measure the right bode plot of the buck converter? i will be grateful for you anyhow.Thank you!

This is the ideal bode plot of the buck converter.

i obtained the next results following picture