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Original question:

[FAQ] LM5175: The difference between lm5175 and lm5176

LM5176: Mode Pin Behavior

Mike Yu
Intellectual 2030 points
Part Number: LM5176
Other Parts Discussed in Thread: LM5175,

Hi Team,

The customer had a production device with LM5175. Since, there is the shortage, they use LM5176 to replace it directly. However, the mode pin resistor is still keeps as 49.9k as the LM5175 setting.

The customer wants to let device work in Hiccup mode. May I know is there any concern to set the mode pin as 49.9k with LM5176? Thank you.

Best regards,

Mike

  • 0
    TI__Mastermind 26070 points

    Hi Mike,

    Thanks for using the e2e forum.
    The hiccup mode of LM5175 and LM5176 should run under the same condition.
    However, the LM5175 is the only device of the two who lists a difference between DCM and CCM operation.
    Do you know if they run their application in DCM or CCM?

    As the MODE pin source current and CCM hiccup voltage threshold are identical within both devices, I would not expect any difference in behavior if they keep using the 49.9k Ohm resistor.

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    TI__Intellectual 2030 points

    Hi Niklas,

    The customer application will run in both DCM and CCM mode. They just want to know is there any risk to set mode resistor as 49.9k ohm. It looks this should be okay. Thank you.

    Best regards,

    Mike

  • 0 in reply to Mike Yu
    TI__Mastermind 26070 points

    Hi Mike,

    Thanks for the update.
    Yes, I agree this should be okay.

    Of course I would still recommend to run a quick sanity check test on their board with LM5176, to see if the hiccup behaves as expected.

    Best regards,
    Niklas 

  • 0 in reply to Niklas Schwarz
    TI__Intellectual 2030 points

    Hi Niklas,

    Get it, thanks for the support :-)

    Best regards,

    Mike