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Original question:

LM5117-Q1: CCCV

LM5117-Q1: LM5117 CC/CV compensatation

Christian Lees12
Prodigy 85 points
Part Number: LM5117-Q1
Other Parts Discussed in Thread: TLV431, LM5117

When calculating the compensation values for a CC/CV feedback loop based on SNVA829 from formula 46 from the datasheet is Rfb2 the resistor between  the CM pin and the FB pin, or the resistor from Vout to the control pin on the TLV431?

Is there any explanation on this feedback loop in terms of frequency response an compensation?

Thanks

  • 0
    TI__Mastermind 27045 points

    Hi Chris,

    It should be the resistor from Vout to the control pin on the TLV431.

    TLV431 only impact output regulation at CV mode, you can think the feedback loop shift the feedback voltage from LM5117 0.8V to TLV431 2.54V, all other loop analysis is same as described on data sheet.

    B R

    Andy