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Original question:

[FAQ] List of FAQs for TPS923655 / TPS923654 / TPS923653 / TPS923652 LED driver

[FAQ] How to design the COMP pin components for TPS923655 / TPS923654 / TPS923653 / TPS923652?

Steven Li
Mastermind 19685 points
Other Parts Discussed in Thread: TPS923652, TPS923653, TPS923654, TPS923655

How to design the COMP pin components for TPS923655 / TPS923654 / TPS923653 / TPS923652?

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    TI__Mastermind 19685 points

    Below are some theoretical tips and explanations on how to design the COMP pin components for TPS923655 / TPS923654 / TPS923653 / TPS923652 (A graphical illustration for boost connection is shown below for reference.):

    • You can calculate the loop bandwidth with this equation: bandwidth = gM(ea) / (2 * π * CCOMP). You can find gM(ea) in Section 7.5 from the datasheet.
    • The RCOMP is used to add a zero to the loop response. You can calculate this with fzero = 1 / (2 * π * CCOMP * RCOMP).
    • The usage of RDAMP is illustrated in Section 9.2.1.2.5 from the datasheet.
    • The CCOMP and RCOMP are necessary. The RDAMP is optional.

    Please be noticed that those are all theoretical calculations and can just be used as a reference. You should design and adjust the components based on your test results.