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OPA2365: OPA2365 Issue

Feng Ge
Prodigy 170 points

Part Number: OPA2365
Other Parts Discussed in Thread: OPA365

Hi:

    I am using OPA2365,Attachment is SCH!

    Output signal （ IPFC_DET）is  wrong,Can not enlarge the sampling current signal（PFC_CS+ &PFC_CS-）.

    But I removed R042,R043, IPFC_DET is right!

    Could you give me some advice，Thank you!

  • 0
    TI__Mastermind 25865 points
    Hello,

    Please understand that most of our engineers are out for the holidays. It is most likely that we won't address your question until early January 2017.
  • 0 in reply to Pete%20Semig
    TI__Guru 64475 points
    Hello Feng,

    What is the IPFC_DET signal doing when R043 and R042 are installed? Is the IC021A output saturated to a power-supply rail or is it suffering from accuracy issues? If it is an accuracy issue, how large is the error? Providing a few measurement reading will be helpful to understand what effects the R043 and R042 resistors are having on the circuit performance.

    That said, the OPA365 will have over 30% overshoot with the 100pF load that's been placed directly on the output of IC021B. With R043 and R042 installed try removing this capacitor to see if the behavior improves.