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TPS2660: Purpose of series resistor to Cdvdt

Part Number: TPS2660


in TIDUCC7 (Input Protection and Backup Supply Reference Design for 25-W PLC Controller Unit) there is a series resistor (R10) to Cdvdt (C15). This resistor is neither described in datasheet nor in EVM or design calculator. Is there any technical reason for this resistor?


  • Hi Andreas,

    Thanks for reaching out!

    The series resistor (R10) provides offset voltage (Idvdt*R10) at the Cdvdt pin during supply power fail events and enables quick recovery when input supply resumes.

    The below test waveforms helps to clarify

    (1) without R10

    (2) with R10

    Best Regards, Rakesh