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LM5170EVM-BIDIR: Software frequency response analyzer (SFRA) for LM5170EVM-BIDIR

Part Number: LM5170EVM-BIDIR
Other Parts Discussed in Thread: SFRA


I am currently working with LM5170EVM. I would like to receive loop gain information to design compensator for boost operation of LM5170EVM.

Can I use SFRA for measuring open loop transfer function of the plant?

Also, will there be any other suggested method to measure open loop gain of LM5170EVM in boost operation.

Thank you

  • Hello Jeet,

    The measurement is straight forward. A 50ohm resistor can be added to the top of voltage feedback resistor divider. Inject the perturbation across this resistor and measure the input and output. So any analyzer that can inject floating signals  and measure the two frequency gain/phase responses (frequency sweep) or direct calculate the output/input would work.

    Please let me know if there is any question.