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LM5175: Why does device go to HICCUP mode?

AnBer
Mastermind 30150 points
Part Number: LM5175
Other Parts Discussed in Thread: LM5176

Team,

Customer would need clarification about current limiting and CCM/DCM operation.
-Do we have some specific app note covering this (as the datasheet is not very extensive)?
-How to tell why device goes into hiccup mode?
-What are the LM5176 vs LM5175 differences in term of current limiting, CCM/DCM and hiccup mode?

I can share offline the schematics of a prototype board in order to review the schematics.

Thanks in advance,

A.

  • 0
    TI__Guru 65340 points

    Hello AnBer,

    DCM/CCM: The device operates in DCM if the Mode is selected accordingly and the inductor current gets to 0A, see chapter 8.3.7 in the datasheet.

    Hiccup mode: Please review the overcurrent chapter 8.3.5 in the datasheet for hiccup mode. So the device goes into hiccup mode, if it detects several peak current cycles above the threshold. 

    LM5176: somewhat higher current capability in buck-boost mode. No DCM capability.

    Best regards,
    Brigitte