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Original question:

ULC1001-DRV290XEVM: Resonant frequency

ULC1001-DRV290XEVM: LC Value

WONBIN LEE
Intellectual 260 points
Part Number: ULC1001-DRV290XEVM
Other Parts Discussed in Thread: DRV2901

Tool/software:

Hello,

I have some questions.

Q1. Are there any calculation formulas or data for matching the Q value of the DRV2901 output LC Filter?

Q2. If the LCS changes, do I need to change the L and C values?

  • 0
    TI__Expert 4030 points

    For Q1: we do not have the detailed formulas for matching the Q value since the load piezo is a complex load. Its bulk capacitance may has significant effect on the LC filter Q values. 

    For Q2: Yes, it is needed to change L and C for different LCS. The cutting off frequency of the LC filter needs to be adjusted based on the resonant frequency of LCS.